JP4175487B2 - Contaminated soil purification equipment - Google Patents

Description

  The present invention relates to a contaminated soil purification apparatus for removing harmful organic substances from soil contaminated with organic chlorine compounds such as PCBs and dioxins, and harmful organic substances such as oil.

  FIG. 7 shows a schematic configuration of an example of a conventional contaminated soil purification apparatus that purifies soil contaminated with organic chlorinated compounds such as PCBs and dioxins, and harmful organic substances such as oil (for example, Patent Documents 1 to 1 listed below). (See 3 etc.).

  As shown in FIG. 7, the conventional contaminated soil purification apparatus 20 is supplied with a hydrophilic cleaning solvent 4 such as alcohol or ketone in a cleaning tank 21 into which soil 1 contaminated with harmful organic matter 2 is charged. Then, after extracting and transferring the harmful organic matter 2 in the soil 1 to the cleaning solvent 4, the soil 1 is purified by drying the soil 1.

  Further, the cleaning solvent 4 used for cleaning the soil 1 and containing the water 3 in the soil 1 together with the harmful organic matter 2 is purified and recovered by being distilled by the distillation device 22 and reused for the cleaning of the soil 1. Is done.

  Then, the mixture of the water 3 and the toxic organic matter 2 remaining by the purification of the cleaning solvent 4 is further concentrated and distilled by the concentration distillation device 23, and the volume of the water 3 is distilled off to reduce the volume. The collected water 3 is returned into the soil 1 and the residual concentrate of the harmful organic matter 3 is detoxified in the harmful organic matter treatment step.

JP 11-005075 A JP 2001-334249 A JP 2003-220380 A

  In the conventional contaminated soil purification apparatus 20 as described above, if the soil 1 is clayey, the cleaning solvent 4 is difficult to uniformly penetrate into the soil 1 in the cleaning tank 21 and at the same time, the cleaning solvent into the soil 1. Since 4 is likely to remain, work efficiency has deteriorated compared to the case of coarse-grained soil such as sand and gravel.

  In view of the above, an object of the present invention is to provide a contaminated soil purification apparatus capable of greatly improving the efficiency of purification treatment of soil contaminated with harmful organic substances.

  The contaminated soil purification apparatus according to the first invention for solving the above-mentioned problem is a contaminated soil purification apparatus that removes the harmful organic matter from the soil contaminated with the harmful organic matter, which is more than the soil and water. A slurry generation means for generating a slurry of the soil by mixing a cleaning solvent having a small specific gravity and partial water solubility, and the cleaning solvent circulates from below to above, and the slurry is from above to below A washing tower that circulates toward the bottom, a sealing tank that is connected to the lower part of the washing tower and is filled with water, and a soil post-treatment means that is connected to the sealing tank and dries the collected soil And a first specific gravity separation means connected to the upper side of the washing tower and separating the washing solvent and water sent from the washing tower by specific gravity, and separated by the first specific gravity separation means. in front Distilling the washed solvent, characterized in that it comprises a distillation means for separating into a concentrate containing the toxic organic matter with the cleaning solvent and water.

  The contaminated soil purification apparatus according to the second invention is characterized in that, in the first invention, the saturation solubility of the cleaning solvent in water is 30 wt.% Or less.

  The contaminated soil purification apparatus according to the third invention is characterized in that, in the first or second invention, the distillation means comprises a first acid addition means for adding an acid to the liquid to be distilled. .

  According to a fourth aspect of the present invention, there is provided a contaminated soil purification apparatus, comprising: mixing an azeotropic solvent azeotropic with water and water separated and recovered by the distillation means in any one of the first to third inventions. Concentrated distillation means for collecting a concentrate containing harmful organic substances remaining in the water by azeotropic distillation is provided.

  According to a fifth aspect of the present invention, there is provided a contaminated soil purification apparatus according to the fourth aspect, wherein the azeotropic solvent has hydrophilicity, and the concentrated distillation means is separated from the azeotropic solvent by the distillation means. It is characterized by comprising a concentration distillation apparatus main body for recovering a concentrate containing harmful organic substances remaining in the water by mixing the recovered water with azeotropic distillation.

  According to a sixth aspect of the present invention, there is provided a contaminated soil purification apparatus according to the fourth aspect, wherein the azeotropic solvent is partially water-soluble, and the concentrated distillation means includes the azeotropic solvent and the distillation means. Concentrated distillation apparatus main body for recovering a concentrate containing harmful organic substances remaining in the water by mixing and recovering the separated and recovered water, and the azeotropically distilled water and the azeotropic solvent And a second distillation unit for separating the water and the azeotropic solvent contained in the water by distilling the water separated by specific gravity. It is characterized by.

  The contaminated soil purification apparatus according to the seventh invention is characterized in that, in the sixth invention, the saturation solubility of the azeotropic solvent in water is 30 wt.% Or less.

  The contaminated soil purification apparatus according to the eighth invention is the fourth invention, wherein the azeotropic solvent is hydrophobic, and the concentrated distillation means is separated from the azeotropic solvent by the distillation means. A concentrated distillation apparatus main body for recovering a concentrate containing harmful organic substances remaining in the water by mixing and azeotropic distillation with the recovered water, the azeotropically distilled water and the azeotropic solvent It is characterized by comprising a second specific gravity separation means for separating the specific gravity, and a first aeration means for aeration of the water separated by specific gravity.

  According to a ninth aspect of the present invention, there is provided the contaminated soil purification apparatus according to any one of the fourth to eighth aspects, wherein the water separated and recovered by the concentrated distillation means and circulated out of the system is circulated. It is characterized by comprising a separation membrane device for performing a final treatment of water and an activated carbon tank.

  A contaminated soil purification apparatus according to a tenth aspect of the present invention includes the second aeration means for aerating the concentrate collected by the concentration distillation means in any of the fourth to ninth aspects of the invention. It is characterized by.

  The polluted soil purification apparatus according to the tenth invention comprises the second acid addition means for adding an acid to the liquid distilled by the concentrated distillation means in any of the fourth to tenth inventions. It is characterized by.

  In the contaminated soil purification apparatus according to the first invention, even if the soil is clayey, it is easy to allow the cleaning solvent to uniformly penetrate into the soil, and the cleaning solvent remains in the soil. Can be removed without any trouble, so even if the soil is clayey, it can be treated efficiently, and its workability is comparable to that of coarse-grained soil such as sand and gravel. In addition, it is possible to easily prevent the cleaning solvent containing harmful organic substances from reattaching to the soil.

  In the contaminated soil purification apparatus according to the second aspect, the soil washing treatment can be performed efficiently.

  In the contaminated soil purification apparatus according to the third aspect of the invention, even if the cleaning solvent to be distilled is alkaline, foaming of the cleaning solvent during distillation can be prevented. It is possible to easily prevent the organic matter from flowing out, and the working efficiency can be greatly improved.

  In the contaminated soil purification apparatus according to the fourth aspect of the present invention, it is easy to reliably prevent harmful organic substances from flowing out of the system together with water, so the volume of the harmful organic substances can be easily reduced. Work efficiency can be greatly improved.

  In the contaminated soil purification apparatus according to the fifth aspect, the effect according to the fourth aspect can be reliably obtained.

  In the contaminated soil purification apparatus according to the sixth aspect, the effect according to the fourth aspect can be reliably obtained.

  In the contaminated soil purification apparatus according to the seventh aspect, the effect according to the sixth aspect can be obtained efficiently.

  In the contaminated soil purification apparatus according to the eighth aspect, the effect according to the fourth aspect can be reliably obtained.

  In the contaminated soil purification apparatus according to the ninth aspect, it is possible to more reliably prevent harmful organic substances from flowing out of the system together with water.

  In the contaminated soil purification apparatus according to the tenth aspect, since the volume of the toxic organic substance concentrate can be further reduced, the post-treatment process can be further facilitated.

  In the contaminated soil purification apparatus according to the tenth aspect of the invention, since it is possible to easily prevent harmful organic substances from flowing out of the system together with water, it is easy to reduce the volume of the mixture of harmful organic substances. This can be done and the working efficiency can be greatly improved.

  Embodiments of a contaminated soil purification apparatus according to the present invention will be described below with reference to the drawings, but the present invention is not limited to the following embodiments.

[First embodiment]
A first embodiment according to the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a first embodiment according to the present invention.

  As shown in FIG. 1, the contaminated soil purification apparatus according to the present embodiment removes the harmful organic matter 2 from the soil 1 contaminated with an organic chlorine compound such as PCB or dioxins or a harmful organic matter 2 such as oil. This is a contaminated soil purification apparatus 100 that is a slurry generating means for generating a slurry 6 of the soil 1 by mixing the soil 1 and a cleaning solvent 5 having a specific gravity smaller than that of the water 3 and having partial water solubility. The mixing tank 110, the cleaning solvent 5 circulates from below to above, and the slurry 6 circulates from above to below and is connected to the lower part of the cleaning tower 120, and the interior is filled with water. Connected to the sealing tank 130, the soil post-treatment tank 140 that is a soil post-treatment means for drying the collected soil 1, and the cleaning tower 120. The first specific gravity separation tank 150 which is a first specific gravity separation means for separating the specific gravity of the cleaning solvent 5 and water 3 sent from the inside of the water 0 and the cleaning solvent 5 separated in the first specific gravity separation tank 150 A distillation apparatus 160 which is a distillation means for performing distillation to separate the solvent 5, the water 3, and the concentrate containing the toxic organic substance 2 is provided.

  The mixing tank 110 includes a tank body 111 to which the soil 1 and the cleaning solvent 5 are supplied, and a stirring blade 112 that stirs the soil 1 and the cleaning solvent 5.

  In the washing tower 120, a feed pump 101 for feeding the slurry 6 generated in the tank body 110 of the mixing tank 110 communicates with the upper part, and the cleaning solvent 5 separated and recovered by the distillation apparatus 160 and newly replenished. A feed pump 102 for feeding the cleaning solvent 5 communicates downward.

  The seal tank 130 is a feed pump that feeds the water 3 separated in the specific gravity separation tank 150, the water 3 separated and recovered by the distillation device 160, and the water 3 replenished in advance from outside the system at the start of operation. 103 contacts the upper side.

  The soil post-treatment tank 140 performs solid-liquid separation of the soil 1 and the water 3 so as to remove the water 3 from the soil 1 that has been fed together with the water 3 from the cleaning tower 120 via the seal tank 130. The soil 1 separated into solid and liquid can be dried.

  The first specific gravity separation tank 150 is supplied with the cleaning solvent 5 flowing out from above the washing tower 120 from above, and feeds the water 3 separated in the soil post-treatment tank 140. Is communicating upwards.

  The distillation apparatus 160 is connected to a feed pump 105 that feeds the cleaning solvent 5 separated in the first specific gravity separation tank 150 and distills the cleaning solvent 5 to water 3, the cleaning solvent 5, and harmful organic substances. The first distillation apparatus 161 is separated into two, and the cleaning solvent 5 and the harmful organic substance 2 separated by the first distillation apparatus 161 are distilled to be separated into the concentrate containing the cleaning solvent 5 and the harmful organic substance 2. And a second distillation apparatus 162.

  A part of the cleaning solvent 5 delivered from the feed pump 105 is supplied into the tank body 111 of the mixing tank 110.

  The cleaning solvent 5 has a specific gravity smaller than that of the water 3 and is partially water-soluble. In particular, the saturated solubility in water is preferably 30 wt.% Or less. For example, butanol, amyl alcohol, ethyl A solvent having 4 or more carbon atoms, such as ether, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, etc., is preferably used.

  Next, a contaminated soil purification method using the contaminated soil purification apparatus 100 according to this embodiment will be described.

  The cleaning solvent 5 is supplied to the inside of the tank main body 111 of the mixing tank 110, and the slurry 1 is produced | generated by throwing in the soil 1 while rotating the stirring blade 112. FIG. At this time, although the soil 1 contains water 3, the cleaning solvent 5 is partially water-soluble, so that it is evenly dispersed in the cleaning solvent 5 to form a uniform slurry 6 and adheres to the soil 1. The harmful organic substance 2 is dissolved in the cleaning solvent 5 and migrates.

  Next, the slurry 6 of the tank body 111 of the mixing tank 110 is removed from the cleaning tower 120 by operating the feed pump 101 after operating the feed pump 103 and then filling the seal tank 130 with water 3. When the cleaning solvent 5 is supplied from the lower side to the upper side by operating the feed pump 102, the slurry 6 and the cleaning solvent 5 are supplied. Circulates as a counter flow in the cleaning tower 120.

  For this reason, the cleaning solvent 5 in the slurry 6 is pushed away upward and separated from the soil 1 by the cleaning solvent 5 circulated from below, whereas the soil 1 in the slurry 6 is caused by a difference in specific gravity with the cleaning solvent 5. Then, it flows downward and is supplied into the seal tank 130.

  As a result, the cleaning solvent 5 in the slurry 1 and the cleaning solvent 5 supplied from below into the cleaning tower 120 together with the harmful organic matter 2 adhering to the soil 1 are introduced into the specific gravity separation tank 150 from above the cleaning tower 120. The soil 1 is deposited in the seal tank 130 after the harmful organic matter 2 is removed together with the cleaning solvent 5.

  Moreover, since the sealing tank 130 is filled with water 3 inside, the cleaning solvent 5 containing the toxic organic matter 2 is not mixed inside, so the toxic organic matter to the soil 1 deposited inside Reattachment of 2 is prevented.

  The soil 1 from which the harmful organic substances 2 have been washed and removed in this way is fed from the seal tank 130 into the soil post-treatment tank 140 together with the water 3, and is solid-liquid separated and dried in the treatment tank 140. Thus, after the water 3 (including the cleaning solvent 5 dissolved in the water 3) is removed, the water 3 is taken out from the treatment tank 140 and the purification process is finished. On the other hand, the water 3 separated from the soil 1 is fed into the specific gravity separation tank 150 by the operation of the feed pump 104.

  In the specific gravity separation tank 150, the cleaning solvent 5 (containing harmful organic matter 2) fed from above the washing tower 120 is located in the upper layer, and the water 3 fed from the soil post-treatment tank 140 is placed in the lower layer. It is separated into two layers so as to be located.

  Therefore, the feed pump 103 is operated as necessary to supply the lower-layer water 3 in the specific gravity separation tank 150 to the seal tank 130, thereby replenishing the lack of water 3 in the seal tank 130. be able to.

  Further, by operating the feed pump 105 and feeding the upper layer cleaning solvent 5 in the specific gravity separation tank 150 to the first distillation device 161 of the distillation device 160 and distilling it, it dissolves in the cleaning solvent 5. The water 3 to be distilled off can be distilled off, and the cleaning solvent 5 containing the harmful organic matter 2 can be fractionated. The distilled water 3 is used for replenishing the water 3 in the seal tank 130 together with the water 3 from the specific gravity separation tank 150.

  The cleaning solvent 5 delivered from the specific gravity separation tank 150 by the operation of the feed pump 105 is not only fed to the first distillation device 161 of the distillation device 160, but a part of the cleaning solvent 5 is mixed. It is supplied to the inside of the tank body 111 of the tank 110 and reused. Moreover, when the water 3 in a system becomes surplus, the water 3 distilled off by the 1st distillation apparatus 161 of the distillation apparatus 160 opens the valve | bulb 100a, and is discharged | emitted out of the system.

  On the other hand, the cleaning solvent 5 separated by the first distillation apparatus 161 is purified and recovered by being distilled by the second distillation apparatus 162, and the concentrate of the harmful organic matter 2 remains. The purified and recovered cleaning solvent 5 is reused so as to be supplied into the cleaning tower 120 from below by the operation of the feed pump 102. The concentrated residue of the toxic organic substance 2 is detoxified in the toxic organic substance treatment step.

  That is, in this embodiment, the soil 1 is slurried with the cleaning solvent 5 having partial water solubility, thereby imparting fluidity to the soil 1 while uniformly dispersing the soil 1 and cleaning the harmful organic matter 2 in the soil 1. By shifting to the solvent 5 and bringing the slurry 6 into contact with the cleaning solvent 5 in a counter flow, the cleaning solvent 5 is washed away from the soil 1 of the slurry 6 together with the harmful organic matter 2, and the soil 1, the harmful organic matter 2 and the cleaning solvent 5 are washed away. It was made to separate.

  For this reason, in this embodiment, even if the soil 1 is clayey, it is easy to allow the cleaning solvent 5 to uniformly penetrate into the soil 1, and the cleaning solvent 4 is removed from the soil 1. It can be easily removed without remaining.

  Therefore, according to this embodiment, even if the soil 1 is clayey, it can be processed efficiently, and workability comparable to that of coarse-grained soil such as sand and gravel is comparable. Obtainable.

  In addition, since the soil 1 washed in a counterflow with the partially water-soluble washing solvent 5 is once fed into the water 3, the washing solvent 5 containing the harmful organic matter 2 is reattached to the soil 1. Can be easily prevented.

[Second Embodiment]
A second embodiment according to the present invention will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of the second embodiment according to the present invention. In addition, about the part similar to the case of 1st embodiment mentioned above, by using the code | symbol same as the code | symbol used in description of 1st embodiment mentioned above, 1st embodiment mentioned above. The description overlapping with the description in is omitted.

  As shown in FIG. 2, the contaminated soil purification apparatus according to the present embodiment is a contaminated soil purification apparatus 200 that removes the harmful organic matter 2 from the soil 1 contaminated with the harmful organic matter 2, and includes the soil 1 and the cleaning solvent 5. And the mixing tank 110 which is a slurry generating means for generating the slurry 6 of the soil 1 and the cleaning solvent 5 circulates from below to above and the slurry 6 circulates from above to below. The tower 120, the seal tank 130 connected to the lower part of the washing tower 120 and filled with water, and the soil which is connected to the seal tank 130 and is a soil post-treatment means for drying the recovered soil 1 The first specific gravity separation tank which is connected to the post-treatment tank 140 and above the washing tower 120 and is a first specific gravity separation means for carrying out the specific gravity separation of the washing solvent 5 and the water 3 sent from the washing tower 120. 150 and the first And a distillation apparatus 260 is a distillation means for separating into a concentrate by distillation of cleaning solvent 5 separated by gravity separation tank 150 containing cleaning solvent 5 water 3 harmful organic matter 2.

  The distillation apparatus 260 is connected to a feed pump 105 that feeds the cleaning solvent 5 separated in the first specific gravity separation tank 150 and distills the cleaning solvent 5 to water 3, the cleaning solvent 5, and harmful organic substances. The first distillation apparatus 161 is separated into two, and the cleaning solvent 5 and the harmful organic substance 2 separated by the first distillation apparatus 161 are distilled to be separated into the concentrate containing the cleaning solvent 5 and the harmful organic substance 2. A second distillation apparatus 162; and a first acid addition apparatus 263 which is a first acid addition means for adding an acid 7 such as hydrochloric acid or sulfuric acid to the cleaning solvent 5 distilled by the first distillation apparatus 161. Yes.

  In such a contaminated soil purification apparatus 200 according to the present embodiment, the feed pump 105 is operated to feed the upper cleaning solvent 5 in the specific gravity separation tank 150 to the first distillation apparatus 161 of the distillation apparatus 160. In addition, the pH of the cleaning solvent 5 is measured, and when the cleaning solvent 5 is alkaline (exceeding pH 7), the acid is adjusted so that the cleaning solvent 5 becomes neutral to weakly acidic (pH 6-7). After the acid 7 is added to the cleaning solvent 5 from the adding device 263, the cleaning solvent 5 is distilled by the first distillation device 161.

  That is, in the present embodiment, when the cleaning solvent 5 to be distilled is alkaline in the first embodiment described above, the cleaning solvent 5 is changed from neutral to weakly acidic.

  This is because if the cleaning solvent 5 to be distilled is alkaline, the harmful organic matter 2 (particularly oil) dissolved in the cleaning solvent 5 reacts with the alkali component and easily foams, making it difficult to control the distillation operation. .

  For this reason, in this embodiment, even if the cleaning solvent 5 to be distilled is alkaline, it is adjusted from neutral to weakly acidic during distillation, so that the cleaning solvent 5 does not foam during distillation. .

  Therefore, according to the present embodiment, it is possible to obtain the same effect as that of the first embodiment described above, and even if the cleaning solvent 5 to be distilled shows alkalinity. Since the foaming of the cleaning solvent 5 during distillation can be prevented, the distillation operation control can be easily stabilized, and the working efficiency can be greatly improved.

  In this embodiment, the acid 7 is added only to the liquid distilled in the first distillation apparatus 161 (the cleaning solution 5 containing the water 3 and the harmful organic matter 2). However, in the second distillation apparatus 162, If the liquid to be distilled (cleaning solution 5 containing the toxic organic substance 2) also shows alkalinity, an acid addition means is further provided so that the acid 7 can be added to the liquid distilled by the second distillation apparatus 162. It is also possible to make it.

[Third embodiment]
A third embodiment according to the present invention will be described with reference to FIG. FIG. 3 is a schematic configuration diagram of the third embodiment according to the present invention. In addition, about the part similar to the case of 1st, 2nd embodiment mentioned above, by using the code | symbol same as the code | symbol used in description of 1st, 2nd embodiment mentioned above, the 1st mentioned above. The description overlapping with the description in the second embodiment is omitted.

  As shown in FIG. 3, the contaminated soil purification apparatus according to the present embodiment is a contaminated soil purification apparatus 300 that removes the harmful organic matter 2 from the soil 1 contaminated with the harmful organic matter 2, and includes the soil 1 and the cleaning solvent 5. And the mixing tank 110 which is a slurry generating means for generating the slurry 6 of the soil 1 and the cleaning solvent 5 circulates from below to above and the slurry 6 circulates from above to below. The tower 120, the seal tank 130 connected to the lower part of the washing tower 120 and filled with water, and the soil which is connected to the seal tank 130 and is a soil post-treatment means for drying the recovered soil 1 The first specific gravity separation tank which is connected to the post-treatment tank 140 and above the washing tower 120 and is a first specific gravity separation means for carrying out the specific gravity separation of the washing solvent 5 and the water 3 sent from the washing tower 120. 150 and the first A distillation apparatus 260 that is a distillation means for distilling the cleaning solvent 5 separated in the specific gravity separation tank 150 into a concentrate containing the cleaning solvent 5, water 3, and harmful organic substances 2, and azeotropically with water 3 Concentration for recovering a concentrate containing the harmful organic matter 2 remaining in the water 3 by mixing the azeotropic solvent 8 having hydrophilicity and the water 3 separated and recovered by the distillation apparatus 260 and performing azeotropic distillation. A concentration distillation apparatus 370 that is a distillation means, and a separation membrane apparatus 381 and an activated carbon tank 382 that perform final treatment of the water 3 by circulating the water 3 separated and recovered by the concentration distillation apparatus 370 and discharged outside the system; It has.

  The azeotropic solvent 8 is azeotropic with the water 3 and has hydrophilicity, and is preferably an alcohol solvent such as ethanol or propanol, a ketone solvent, or an ester solvent.

  The concentrated distillation apparatus 370 performs azeotropic distillation by mixing the water 3 separated and collected by the distillation apparatus 260 and fed by the feed pump 106 through the valve 100a and the azeotropic solvent 8. A concentration distillation apparatus main body 371 for recovering a concentrate containing a very small amount of harmful organic matter 2 that remains in the water 3 should be provided.

  The separation membrane device 381 is mixed with the liquid mixture by any chance by flowing the liquid mixture of the water 3 and the azeotropic solvent 8 separated and recovered by the concentration distillation apparatus 370 and discharged to the outside of the system. A very small amount of the insoluble harmful organic substance 2 that has been clogged can be removed from the liquid mixture.

  The activated carbon tank 382 removes a very small amount of harmful organic substances 2 that have been mixed and dissolved in the mixed solution from the mixed solution by flowing the mixed solution flowing through the separation membrane device 381. Be able to.

  In such a contaminated soil purification apparatus 300 according to the present embodiment, the water 3 and the azeotropic solvent 8 separated and recovered by the distillation apparatus 260 and fed by the feed pump 106 via the valve 100a are combined. Concentrated distillation apparatus main body 371 of concentrated distillation apparatus 370 is mixed and subjected to azeotropic distillation, so that a concentrate containing only a slight amount of harmful organic substance 2 that remains in water 3 should be left in the water 3 and The mixed solution of the azeotropic solvent 8 is separated and recovered.

  The concentrate of the toxic organic substance 2 separated and recovered is detoxified in the toxic organic substance treatment step. On the other hand, the mixed liquid of the water 3 and the azeotropic solvent 8 separated and recovered is circulated through the separation membrane device 381, so that a very small amount of insoluble harmful organic substances 2 that have been mixed into the mixed liquid by any chance. After being reliably removed, by passing through the activated carbon tank 382, a very small amount of harmful organic matter 2 that has been mixed and dissolved in the liquid mixture is surely removed and then discharged out of the system. .

  That is, in this embodiment, in the second embodiment described above, the water 3 discharged to the outside of the system is azeotropically distilled together with the azeotropic solvent 8, so that it remains in the water 3 by any chance. A very small amount of harmful organic substances 2 are removed, and the separated and recovered mixed liquid is filtered and adsorbed, so that a very small amount of various harmful organic substances 2 mixed into the mixed liquid by any chance. Is surely removed.

  For this reason, in this embodiment, it is easy to reliably prevent the harmful organic substance 3 from flowing out of the system together with the water 3.

  Therefore, according to this embodiment, the same effect as that of the second embodiment described above can be obtained, and the harmful organic substance 3 flows out of the system together with the water 3. Therefore, the volume of the mixture of harmful organic substances 2 can be easily reduced, and the working efficiency can be greatly improved.

[Fourth embodiment]
A fourth embodiment according to the present invention will be described with reference to FIG. FIG. 4 is a schematic configuration diagram of the fourth embodiment according to the present invention. In addition, about the part similar to the case of the 1st-3rd embodiment mentioned above, by using the code | symbol same as the code | symbol used in description of the 1st-3rd embodiment mentioned above, the 1st mentioned above. The description overlapping with the description in the third embodiment is omitted.

  As shown in FIG. 4, the contaminated soil purification apparatus according to the present embodiment is a contaminated soil purification apparatus 400 that removes the harmful organic matter 2 from the soil 1 contaminated with the harmful organic matter 2, and includes the soil 1 and the cleaning solvent 5. And the mixing tank 110 which is a slurry generating means for generating the slurry 6 of the soil 1 and the cleaning solvent 5 circulates from below to above and the slurry 6 circulates from above to below. The tower 120, the seal tank 130 connected to the lower part of the washing tower 120 and filled with water, and the soil which is connected to the seal tank 130 and is a soil post-treatment means for drying the recovered soil 1 The first specific gravity separation tank which is connected to the post-treatment tank 140 and above the washing tower 120 and is a first specific gravity separation means for carrying out the specific gravity separation of the washing solvent 5 and the water 3 sent from the washing tower 120. 150 and the first A distillation apparatus 260 that is a distillation means for distilling the cleaning solvent 5 separated in the specific gravity separation tank 150 into a concentrate containing the cleaning solvent 5, water 3, and harmful organic substances 2, and azeotropically with water 3 The azeotropic solvent 9 having partial water solubility and the water 3 separated and recovered by the distillation apparatus 260 are mixed and azeotropically distilled to recover the concentrate containing the harmful organic matter 2 remaining in the water 3. A concentration distillation apparatus 470 which is a concentration distillation means, and a separation membrane apparatus 381 and an activated carbon tank 382 for final treatment of the water 3 by circulating the water 3 separated and recovered by the concentration distillation apparatus 470 and discharged to the outside of the system. And.

  The azeotropic solvent 9 is partially water-soluble, and particularly preferably has a saturated solubility in water of 30 wt.% Or less. For example, butanol, amyl alcohol, ethyl ether, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate It is preferable that the solvent is an alcohol type, ether type, ketone type, ester type or the like having 4 or more carbon atoms, such as butyl acetate.

  The concentration distillation apparatus 470 performs azeotropic distillation by mixing the water 3 separated and collected by the distillation apparatus 260 and fed by the feed pump 106 via the valve 100a and the azeotropic solvent 9. The specific gravity of the concentrated distillation apparatus main body 371 for recovering a concentrate containing a very small amount of harmful organic matter 2 that remains in the water 3 by any chance, the azeotropically distilled water 3 and the azeotropic solvent 9 The second specific gravity separation tank 472 which is the second specific gravity separation means to be separated and the water 3 separated by specific gravity are distilled to re-separate the azeotropic solvent 9 contained in the water 3 from the water 3. A distillation apparatus 473.

  In the second specific gravity separation tank 472, the water 3 and the azeotropic solvent 9 azeotropically distilled in the concentration distillation apparatus main body 371 are supplied from above, the azeotropic solvent 9 is located in the upper layer, and the water 3 is in the lower layer. These liquids 3 and 9 can be separated into two layers so as to be positioned.

  The re-distillation apparatus 473 distills the water 3 fed from the lower part of the specific gravity separation tank 472 via the feed pump 107, whereby the azeotropic solvent 9 and the water 3 dissolved in the water 3 are distilled. And can be separated. The separated azeotropic solvent 9 is supplied again into the concentrated distillation apparatus main body 371 via the feed pump 108.

  In the contaminated soil purification apparatus 400 according to this embodiment, the water 3 and the azeotropic solvent 9 azeotropically distilled in the concentration distillation apparatus main body 371 of the concentration distillation apparatus 470 are fed to the specific gravity separation tank 472. The azeotropic solvent 9 separated by specific gravity and separated by specific gravity is returned to the concentrated distillation apparatus main body 371, while the water 3 separated by specific gravity is fed to the re-distillation apparatus 473 via the pump 107 and dissolved. The azeotropic solvent 9 is separated into the water 3 and the azeotropic solvent 9 that has been separated by distillation is returned to the concentrated distillation apparatus main body 371. Distilled and separated water 3 flows through the separation membrane device 381 and the activated carbon tank 382 and is discharged out of the system.

  That is, the third embodiment described above is a case where the azeotropic solvent 8 having hydrophilicity is applied, but this embodiment is a case where the azeotropic solvent 9 having partial water solubility is applied.

  Therefore, according to the present embodiment, it is possible to obtain the same effect as that of the third embodiment described above.

[Fifth embodiment]
A fifth embodiment according to the present invention will be described with reference to FIG. FIG. 5 is a schematic configuration diagram of the fifth embodiment according to the present invention. In addition, about the part similar to the case of 1st-4th embodiment mentioned above, by using the code | symbol same as the code | symbol used in description of 1st-4th embodiment mentioned above, the 1st mentioned above. The description overlapping with the description in the fourth embodiment will be omitted.

  As shown in FIG. 5, the contaminated soil purification apparatus according to the present embodiment is a contaminated soil purification apparatus 500 that removes the harmful organic matter 2 from the soil 1 contaminated with the harmful organic matter 2, and includes the soil 1 and the cleaning solvent 5. And the mixing tank 110 which is a slurry generating means for generating the slurry 6 of the soil 1 and the cleaning solvent 5 circulates from below to above and the slurry 6 circulates from above to below. The tower 120, the seal tank 130 connected to the lower part of the washing tower 120 and filled with water, and the soil which is connected to the seal tank 130 and is a soil post-treatment means for drying the recovered soil 1 The first specific gravity separation tank which is connected to the post-treatment tank 140 and above the washing tower 120 and is a first specific gravity separation means for carrying out the specific gravity separation of the washing solvent 5 and the water 3 sent from the washing tower 120. 150 and the first A distillation apparatus 260 that is a distillation means for distilling the cleaning solvent 5 separated in the specific gravity separation tank 150 into a concentrate containing the cleaning solvent 5, water 3, and harmful organic substances 2, and azeotropically with water 3 Concentration which collects the concentrate containing the harmful organic substance 2 remaining in the water 3 by mixing the azeotropic solvent 10 having hydrophobicity and the water 3 separated and recovered by the distillation apparatus 260 and performing azeotropic distillation. A concentration distillation apparatus 570 which is a distillation means, and a separation membrane apparatus 381 and an activated carbon tank 382 which perform final treatment of the water 3 by circulating the water 3 separated and recovered by the concentration distillation apparatus 570 and discharged to the outside of the system, It has.

  The azeotropic solvent 10 is hydrophobic, and is preferably an aliphatic hydrocarbon or aromatic hydrocarbon solvent such as toluene, xylene, hexane, or the like.

  The concentrated distillation apparatus 570 mixes the water 3 separated and collected by the distillation apparatus 260 and fed by the feed pump 106 via the valve 100a and the azeotropic solvent 10 to perform azeotropic distillation. The specific gravity of the concentrated distillation apparatus main body 371 for recovering a concentrate containing a very small amount of harmful organic matter 2 that remains in the water 3 by any chance, the azeotropically distilled water 3 and the azeotropic solvent 10 A second specific gravity separation tank 472 that is a second specific gravity separation means to be separated and the water 3 separated by specific gravity are aerated to remove the azeotropic solvent 10 that is slightly mixed in the water 3. A blower 574, an aeration pipe 575, an aeration tank 576, a cooler 577, and the like, which are one aeration means, are provided.

  In the contaminated soil purification apparatus 500 according to this embodiment, the azeotropic solvent 10 azeotropically distilled in the concentration distillation apparatus main body 371 of the concentration distillation apparatus 470 and separated in the specific gravity separation tank 472 is the concentrated distillation. While being returned to the apparatus main body 371, the water 3 separated by specific gravity is fed into the aeration tank 576, and the air 11 is sent from the aeration pipe 575 into the water 3 in the aeration tank 576 via the blower 574. As a result, the water 3 is aerated, the azeotropic solvent 10 that is slightly mixed in the water 3 is vaporized, and the azeotropic solvent 10 is completely removed from the water 3.

  The vaporized azeotropic solvent 10 is cooled and liquefied by the cooler 577 and returned to the concentrated distillation apparatus main body 371 via the feed pump 108, while the water 3 from which the azeotropic solvent 10 has been completely removed. Is discharged outside the system through the separation membrane device 381 and the activated carbon tank 382.

  That is, the third embodiment described above is a case where the azeotropic solvent 8 having hydrophilicity is applied, and the fourth embodiment described above is a case where the azeotropic solvent 9 having partial water solubility is applied. However, this embodiment is a case where the azeotropic solvent 10 having hydrophobicity is applied.

  Therefore, according to the present embodiment, it is possible to obtain the same effects as those of the third and fourth embodiments described above.

[Sixth embodiment]
A sixth embodiment according to the present invention will be described with reference to FIG. FIG. 6 is a schematic configuration diagram of the sixth embodiment according to the present invention. In addition, about the part similar to the case of 1st-5th embodiment mentioned above, by using the same code | symbol as the code | symbol used in description of 1st-5th embodiment mentioned above, the 1st mentioned above. The description overlapping with the description in the fifth embodiment will be omitted.

  As shown in FIG. 6, the contaminated soil purification apparatus according to this embodiment is a contaminated soil purification apparatus 600 that removes the harmful organic matter 2 from the soil 1 contaminated with the harmful organic substance 2, and includes the soil 1 and the cleaning solvent 5. And the mixing tank 110 which is a slurry generating means for generating the slurry 6 of the soil 1 and the cleaning solvent 5 circulates from below to above and the slurry 6 circulates from above to below. The tower 120, the seal tank 130 connected to the lower part of the washing tower 120 and filled with water, and the soil which is connected to the seal tank 130 and is a soil post-treatment means for drying the recovered soil 1 The first specific gravity separation tank which is connected to the post-treatment tank 140 and above the washing tower 120 and is a first specific gravity separation means for carrying out the specific gravity separation of the washing solvent 5 and the water 3 sent from the washing tower 120. 150 and the first A distillation apparatus 260 that is a distillation means for distilling the cleaning solvent 5 separated in the specific gravity separation tank 150 into a concentrate containing the cleaning solvent 5, water 3, and harmful organic substances 2, and azeotropically with water 3 Concentration which collects the concentrate containing the harmful organic substance 2 remaining in the water 3 by mixing the azeotropic solvent 10 having hydrophobicity and the water 3 separated and recovered by the distillation apparatus 260 and performing azeotropic distillation. A concentration distillation apparatus 570 which is a distillation means, and a separation membrane apparatus 381 and an activated carbon tank 382 which perform final treatment of the water 3 by circulating the water 3 separated and recovered by the concentration distillation apparatus 570 and discharged to the outside of the system, And an aeration apparatus 690 which is a second aeration means for aerating the concentrate collected by the concentration distillation apparatus 570.

  The aeration apparatus 690 includes an aeration tank 691 to which a concentrate of harmful organic matter 2 collected by the concentration distillation apparatus main body 371 of the concentration distillation apparatus 570 is supplied, and an aeration pipe 692 disposed below the inside of the aeration tank 691. And a blower 693 connected to the aeration pipe 692 for supplying the air 11 and a cooler 694 connected above the aeration tank 691.

  In such a contaminated soil purification apparatus 500 according to this embodiment, the concentrate of the harmful organic matter 2 collected by the concentration distillation apparatus main body 371 of the concentration distillation apparatus 570 is fed into the aeration tank 691 of the aeration apparatus 690. When the air 11 is sent from the aeration pipe 692 to the concentrate in the aeration tank 691 through the blower 693, the concentrate is aerated, and the azeotropic solvent 10 mixed in the concentrate is vaporized. The concentrate is further highly concentrated.

  The highly concentrated harmful organic matter 2 is detoxified in the harmful organic matter treatment step. On the other hand, the vaporized azeotropic solvent 10 is cooled and liquefied by the cooler 694 and returned to the concentrated distillation apparatus main body 371 of the concentrated distillation apparatus 570 via the feed pump 109.

  That is, this embodiment is configured to aerate the concentrate of harmful organic matter 2 collected by the concentration distillation apparatus 570 in the fifth embodiment described above.

  For this reason, in this embodiment, the said concentrate can be further highly concentrated and volume reduction can be aimed at.

  Therefore, according to the present embodiment, the same effect as that of the fifth embodiment described above can be obtained, and further, the volume of the concentrate of the harmful organic matter 2 can be further reduced. Therefore, the post-processing process can be further facilitated.

[Other Embodiments]
In the third to sixth embodiments described above, the second acid addition means for adding the acid 7 to the water 3 distilled by the concentration distillation apparatus main body 371 and the redistillation apparatus 437 is provided. As in the case of the embodiment, when the water 3 to be distilled is alkaline, the water 3 can be distilled from neutral to weakly acidic.

  In the sixth embodiment described above, the concentrate of the harmful organic matter 2 collected by the concentration distillation apparatus 570 in the fifth embodiment described above is aerated by the aeration apparatus 690, thereby further increasing the concentration. Although volume reduction was aimed at, for example, the aeration apparatus 690 aerated the concentrate of the harmful organic matter 2 collected by the concentration distillation apparatuses 370 and 470 in the third and fourth embodiments described above, It is possible to further reduce the volume of the concentrate.

  In the third to sixth embodiments described above, the water 3 discharged from the contaminated soil purification apparatus 200 according to the second embodiment described above is supplied to the concentration distillation apparatuses 370, 470, 570, and the separation membrane apparatus 381. However, the method for purifying contaminated water and the apparatus for purifying contaminated water according to the present invention are not limited to such a case, and the water is contained in water containing harmful organic substances. If harmful organic substances are removed, it can be applied in the same manner as in the third to sixth embodiments described above.

  Since the contaminated soil purification apparatus according to the present invention can be used when removing the harmful organic matter from soil contaminated with harmful organic matter such as organic chlorine compounds such as PCBs and dioxins and oil, , Extremely beneficial.

It is a schematic block diagram of 1st embodiment which concerns on this invention. It is a schematic block diagram of 2nd embodiment which concerns on this invention. It is a schematic block diagram of 3rd embodiment which concerns on this invention. It is a schematic block diagram of 4th embodiment which concerns on this invention. It is a schematic block diagram of 5th embodiment which concerns on this invention. It is a schematic block diagram of 6th embodiment which concerns on this invention. It is a schematic block diagram of an example of the conventional contaminated soil purification apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Soil 2 Harmful organic matter 3 Water 5 Cleaning solvent 6 Slurry 7 Acid 8-10 Azeotropic solvent 11 Air 100 Contaminated soil purification apparatus 100a Valve 101-109 Feeding pump 110 Mixing tank 111 Tank main body 112 Stirring blade 120 Washing tower 130 Sealing tank 140 Soil aftertreatment tank 150 First specific gravity separation tank 160 Distillation apparatus 161 First distillation tower 162 Second distillation tower 200 Contaminated soil purification apparatus 260 Distillation apparatus 263 First acid addition apparatus 300 Contaminated soil purification apparatus 370 Concentrated distillation Apparatus 371 Concentration distillation apparatus main body 381 Separation membrane apparatus 382 Activated carbon tank 400 Contaminated soil purification apparatus 470 Concentration distillation apparatus 472 Second specific gravity separation tank 473 Redistillation apparatus 500 Contaminated soil purification apparatus 570 Concentration distillation apparatus 574 Blower 575 Aeration pipe 576 Aeration tank 577 Cooler 600 Contaminated soil cleanup Generator 690 aeration device 691 aeration tank 692 aeration tube 693 blower 694 cooler

Claims (11)

A contaminated soil purification apparatus for removing harmful organic matter from soil contaminated with harmful organic matter,
Slurry generating means for generating a slurry of the soil by mixing the soil and a cleaning solvent having a specific gravity smaller than water and having partial water solubility;
A cleaning tower in which the cleaning solvent flows from below to above, and the slurry flows from above to below;
A sealing tank connected to the lower part of the washing tower and filled with water;
A soil post-treatment means connected to the sealing tank and drying the recovered soil;
A first specific gravity separation unit connected to the upper side of the washing tower and separating the washing solvent and water sent out from the washing tower with a specific gravity;
A contaminated soil comprising: distillation means for distilling the washing solvent separated by the first specific gravity separation means to separate the washing solvent, water, and a concentrate containing the harmful organic matter. Purification equipment. In claim 1,
The contaminated soil purification apparatus, wherein the washing solvent has a saturation solubility in water of 30 wt.% Or less. In claim 1 or claim 2,
The said soiling means is equipped with the 1st acid addition means which adds an acid to the liquid to distill. The contaminated soil purification apparatus characterized by the above-mentioned. In any one of Claims 1-3,
Concentrated distillation means for recovering a concentrate containing harmful organic substances remaining in the water by mixing the azeotropic solvent azeotropically with water and the water separated and recovered by the distillation means and performing azeotropic distillation. A contaminated soil purification device characterized by comprising: In claim 4,
The azeotropic solvent is hydrophilic.
The concentration distillation means,
A concentration distillation apparatus main body is provided for recovering a concentrate containing harmful organic substances remaining in water by mixing the azeotropic solvent and water separated and recovered by the distillation means and performing azeotropic distillation. Contaminated soil purification device characterized by that. In claim 4,
The azeotropic solvent is partially water-soluble,
The concentration distillation means,
Concentrating distillation apparatus main body for recovering a concentrate containing harmful organic substances remaining in the water by mixing the azeotropic solvent and water separated and recovered by the distillation means and performing azeotropic distillation,
A second specific gravity separation means for carrying out a specific gravity separation between the azeotropically distilled water and the azeotropic solvent;
A contaminated soil purification apparatus, comprising: a distillation apparatus for separating the water from the azeotropic solvent contained in the water by distilling the water separated by specific gravity. In claim 6,
The contaminated soil purification apparatus, wherein the saturated solubility of the azeotropic solvent in water is 30 wt.% Or less. In claim 4,
The azeotropic solvent is hydrophobic,
The concentration distillation means,
Concentrating distillation apparatus main body for recovering a concentrate containing harmful organic substances remaining in the water by mixing the azeotropic solvent and water separated and recovered by the distillation means and performing azeotropic distillation,
A second specific gravity separation means for carrying out a specific gravity separation between the azeotropically distilled water and the azeotropic solvent;
A contaminated soil purification apparatus, comprising: a first aeration means for aeration of the water separated by specific gravity. In any one of Claims 4-8,
A contaminated soil purification apparatus, comprising: a separation membrane device and an activated carbon tank for final treatment of the water by circulating the water separated and recovered by the concentration distillation means and discharged outside the system. In any one of Claims 4-9,
A contaminated soil purification apparatus, comprising: a second aeration means for aeration of the concentrate recovered by the concentration distillation means. In any one of Claims 4-10,
A contaminated soil purification apparatus, comprising: a second acid addition means for adding an acid to the liquid distilled by the concentration distillation means.

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