JP3394964B2 - Method and apparatus for treating leachate at landfill site - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an incineration residue of a waste incinerator that incinerates waste such as municipal waste, and a molten residue (slag) of an ash melting furnace that melts waste incineration ash to form slag. When landfilling such waste as landfill, the leachate from the landfill site is treated to be harmless and NaC
The present invention relates to a method and a device for separating 1 and KCl by utilizing the difference in temperature dissolution characteristics to obtain a highly purified harmless salt of NaCl and a purified salt of KCl.

[0002]

2. Description of the Related Art As a method for treating leachate from a waste landfill site, for example, Japanese Patent Laid-Open No. 11-304131 discloses a method for treating a leachate from a landfill site with a reverse osmosis membrane filter, an electric It is introduced into a precipitation device or an evaporator and concentrated to concentrate, and the concentrated water is introduced into a drying / firing furnace to evaporate the water content, and then rapidly cooled to obtain a by-product salt (dry salt). A technique is disclosed in which dioxins and environmental hormones contained in exhaust gas are brought into contact with an oxidation catalyst to decompose or introduced into an activated carbon packed column to be adsorbed and removed.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The dry salt produced in the method described in No. 04131 generally comprises about 95% total of NaCl and KCl, with the respective contents being about 60-80% NaCl and about 20% KCl.
~ 30%. Here, generally, the purity of NaCl of rock salt imported by each chemical manufacturer as industrial salt is 96 to 97%. Similarly, the purity of KCl salt or KCl fertilizer imported by each chemical manufacturer is 95 to 98%. Therefore,
The dried salt produced from the leachate at the landfill disposal site requires a pre-treatment and is costly in order to be directly used by each chemical manufacturer. That is, it is difficult to recycle the dried salt.

The present invention has been made in view of the above points, and an object of the present invention is to filter landfill leachate by a reverse osmosis membrane filtration device and treat the concentrated water with a heating type crystallization device and a cooling type. By applying a crystallizer and utilizing the difference in solubility between NaCl and KCl in water, high-purity NaCl salt and KCl salt are separated and purified, and dioxins and dioxins contained in the concentrated water of the reverse osmosis membrane filtration device are separated. Salts produced by separating environmental hormones with an NF filtration device or an electrodeposition device and then introducing them into a thermal decomposition furnace, an incinerator or / and an ash melting furnace for decomposition, or decomposed with an accelerated oxidation treatment device. It is intended to provide a method and an apparatus for treating leachate of waste landfill disposal site, which is decomposed in a thermal decomposition furnace.

[0005]

In order to achieve the above object, the method for treating leachate of landfill waste according to the present invention comprises:
Leachate generated at the landfill disposal site of waste such as waste incinerator or / and ash melting furnace residue is introduced into a reverse osmosis membrane (RO membrane) filtration device and filtered, and permeated by the reverse osmosis membrane filtration device. After discharging the water, the concentrated water of the reverse osmosis membrane filtration device is introduced into the NF (nanofilter) filtration device for filtration, and the concentrated water of the NF filtration device is returned to the waste incinerator and / or the ash melting furnace for concentration. The toxic substances in water are pyrolyzed, while the permeated water of the NF filter is subjected to chelate adsorption treatment, then heated to crystallize NaCl salt, and then cooled to crystallize KCl salt. (See Figure 1). As the NF (nanofilter), a filter having a selectively low Na ⁺ , K ⁺ , and Cl ⁻ blocking rate is adopted.

Further, the method for treating leachate of waste landfill disposal site of the present invention is a reverse osmosis membrane for the leachate produced at the landfill site of waste such as the residue of the waste incinerator or / and the ash melting furnace. It is introduced into a filtration device and filtered, the permeated water of the reverse osmosis membrane filtration device is discharged, the concentrated water of the reverse osmosis membrane filtration device is introduced into the NF filtration device and filtered, and the concentrated water of the NF filtration device is pyrolyzed. To heat decompose the harmful substances in the concentrated water, while the permeated water of the NF filter is subjected to chelate adsorption treatment and then heated to give Na.
It is characterized in that the Cl salt is crystallized and then cooled to crystallize the KCl salt (see FIG. 2).

Further, the method for treating leachate of the waste landfill disposal site of the present invention uses a reverse osmosis membrane for the leachate produced at the landfill disposal site of the waste such as the residue of the waste incinerator or / and the ash melting furnace. It is introduced into a filtration device and filtered, the permeated water of the reverse osmosis membrane filtration device is discharged, and the concentrated water of the reverse osmosis membrane filtration device is introduced into the electrodeposition device (electrodialysis device) for electrodeposition processing, and the electrodeposition device The concentrated water of the above is returned to the waste incinerator and / or the ash melting furnace to thermally decompose the harmful substances in the concentrated water, while the permeated water of the electrodeposition apparatus is subjected to chelate adsorption treatment and then heated to crystallize the NaCl salt. It is characterized in that the KCl salt is crystallized by precipitating and then cooling (see FIG. 3).

Further, the method for treating leachate of the waste landfill disposal site of the present invention uses a reverse osmosis membrane for the leachate produced at the landfill disposal site of the waste such as the residue of the waste incinerator or / and the ash melting furnace. It is introduced into a filtration device and filtered, the permeated water of the reverse osmosis membrane filtration device is discharged, the concentrated water of the reverse osmosis membrane filtration device is introduced into the accelerated oxidation treatment device to decompose harmful substances, and the accelerated oxidation treatment device After treated water is chelated, it is heated and NaCl
It is characterized in that the salt is crystallized and then cooled to crystallize the KCl salt (see FIG. 4).

Further, the method for treating leachate of waste landfill disposal site of the present invention is a reverse osmosis membrane for leachate produced in landfill disposal site of waste such as waste incinerator or / and residue of ash melting furnace. It is introduced into a filtration device and filtered, the permeated water of the reverse osmosis membrane filtration device is discharged, and the concentrated water of the reverse osmosis membrane filtration device is subjected to chelate adsorption treatment, then heated to crystallize NaCl salt, and then cooled. KCl salt is crystallized, the crystallized NaCl salt is introduced into the thermal decomposition furnace to thermally decompose the harmful substances, and the crystallized KCl salt is introduced into the thermal decomposition furnace in a system different from that of the NaCl salt Is characterized by thermally decomposing (see FIG. 5).

In these methods, the waste water after cooling to crystallize the KCl salt may be circulated in the crystallization process of the NaCl salt (see FIGS. 1 to 5). Also, cool and KC
In some cases, a part of the waste water after crystallization of the 1-salt is circulated to the crystallization step of the NaCl salt and the rest is dried (see FIG. 6). In some cases, the entire amount of waste water after cooling and crystallizing KCl salt is dried (see FIG. 6). Further, a part of the waste water after cooling to crystallize the KCl salt may be circulated to the NaCl salt crystallization step and the rest may be thermally decomposed (see FIG. 7).

The apparatus for treating leachate from a waste landfill site according to the present invention is an inverse device for filtering leachate generated at a landfill site for waste such as residues from a waste incinerator or / and an ash melting furnace. Osmosis membrane filtration device, NF filtration device for filtering concentrated water of reverse osmosis membrane filtration device, chelate adsorption tower for chelate adsorption treatment of permeated water of NF filtration device, concentrated water of NF filtration device is discarded Concentrated water return line for supplying to a material incinerator or / and an ash melting furnace, a heating type crystallization device for heating treated water from a chelate adsorption tower to crystallize an NaCl salt, and a heating type crystallization Cool the treated water of the equipment to KCl
A cooling type crystallizer for crystallizing a salt is provided (see FIG. 1).

Further, the treatment apparatus for leachate of waste landfill disposal site of the present invention is for filtering leachate produced in landfill disposal site of waste such as residues of waste incinerator and / or ash melting furnace. Reverse osmosis membrane filtration device, an NF filtration device for filtering concentrated water of the reverse osmosis membrane filtration device, a chelate adsorption tower for chelating and adsorbing permeated water of the NF filtration device, and N.
F Pyrolysis furnace for introducing concentrated water of the filtration device to thermally decompose harmful substances, heating type crystallization device for heating treated water from the chelate adsorption tower to crystallize NaCl salt, and heating type A cooling type crystallizer for cooling the treated water of the crystallizer to crystallize a KCl salt is provided (see FIG. 2).

Further, the treatment apparatus for leachate of waste landfill disposal site of the present invention is for filtering leachate produced at the landfill disposal site of waste such as residue of waste incinerator or / and ash melting furnace. Reverse osmosis membrane filtration device, an electrodeposition device (electrodialysis device) for electrodepositing concentrated water of the reverse osmosis membrane filtration device, and a chelate adsorption tower for chelating adsorption treatment of permeated water of the electrodeposition device. , A concentrated water return line for supplying the concentrated water of the electrodeposition apparatus to the waste incinerator and / or the ash melting furnace, and a heating type for heating the treated water from the chelate adsorption tower to crystallize the NaCl salt It is characterized by comprising a crystallizer and a cooling type crystallizer for crystallizing KCl salt by cooling the treated water of the heating crystallizer (see FIG. 3).

Further, the treatment apparatus for leachate of waste landfill disposal site of the present invention is for filtering leachate produced at landfill disposal site of waste such as residue of waste incinerator or / and ash melting furnace. Reverse osmosis membrane filtration device, accelerated oxidization treatment device for introducing concentrated water of reverse osmosis membrane filtration device to decompose harmful substances, and chelate adsorption for chelate adsorption treatment of treated water of accelerated oxidation treatment device Tower and a heating type crystallizer for heating the treated water from the chelate adsorption tower to crystallize the NaCl salt, and cooling for cooling the treated water of the heating type crystallizer to crystallize the KCl salt It is characterized by being equipped with a type crystallization device (see FIG. 4).

Further, the treatment apparatus for leachate of waste landfill disposal site of the present invention is for filtering leachate produced in landfill disposal site of waste such as waste incinerator or / and ash melting furnace residue. Reverse osmosis membrane filtration device, a chelate adsorption tower for chelating the concentrated water of the reverse osmosis membrane filtration device, and a heating type crystal for heating the treated water from the chelate adsorption tower to crystallize NaCl salt And a cooling type crystallizer for cooling the treated water of the heating type crystallizer to crystallize KCl salt, and introducing a NaCl salt from the heating type crystallizer to thermally decompose harmful substances And a different thermal decomposition furnace for thermally decomposing harmful substances by introducing KCl salt from the cooling type crystallizer (see FIG. 5).

In these apparatuses, the chelate adsorption treated water at the outlet of the cooling type crystallizer and the inlet of the heating type crystallizer so that the wastewater from the cooling type crystallizer can be circulated to the heating type crystallizer. There is a case where the conduit is connected by a drainage return conduit (see FIGS. 1 to 5). Further, in order to circulate a part of the wastewater from the cooling type crystallizer to the heating type crystallizer, the chelate adsorption treatment water conduit at the drainage outlet of the cooling type crystallizer and the inlet side of the heating type crystallizer is installed. In some cases, a dryer is provided downstream of the cooling type crystallizer so that the remainder of the waste water can be dried by being connected by a waste water return conduit (see FIG. 6).
In addition, a dryer may be provided downstream of the cooling type crystallizer so that the entire amount of wastewater from the cooling type crystallizer can be dried (see FIG. 6). Further, in order to circulate a part of the wastewater from the cooling type crystallizer to the heating type crystallizer, the drain outlet of the cooling type crystallizer and the chelate adsorption treatment water conduit on the inlet side of the heating type crystallizer are connected. In some cases, a drainage pipe is connected to the pyrolysis furnace so that the remainder of the wastewater can be pyrolyzed by connecting the wastewater return conduit (see FIG. 7).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be appropriately modified and implemented. FIG. 1 shows a waste landfill leachate treatment apparatus according to a first embodiment of the present invention. Reference numeral 10 denotes an incinerator or an ash melting furnace, and the residue (incineration residue or melting residue) discharged from the furnace 10 is conveyed to a landfill disposal site 12. Note that FIG. 1 shows a case where waste is treated as an example of an incineration product.

A water blocking sheet made of plastic is laid in the landfill disposal site 12, and the leachate is extracted by the water collecting pipe provided in the water blocking sheet. This leachate is introduced into the pretreatment device 14 to remove a part of heavy metals, calcium content, etc. in the leachate. As the pretreatment device 14, for example, a coagulating sedimentation tank by a lime soda method is used. The pretreated leachate is introduced into the reverse osmosis membrane (RO membrane) filtration device 28 and filtered, the permeated water is discharged, and the concentrated water is introduced into the NF filtration device 16 and is mainly monovalent ions. Na ⁺ , K ⁺ , Cl ⁻ are collected on the permeate side.

The reverse osmosis membrane is a semipermeable membrane that can be filtered at the molecular level when a pressure higher than the osmotic pressure is applied.
In addition to nitrogen, salts such as calcium, sodium and potassium, dioxins, environmental hormones (for example, bisphenol A, organic chlorine-based substances, etc.), heavy metals and the like can be separated on the concentrated liquid side. The NF filtration device 16 is a device provided with a nano filter (NF) as a permeable membrane,
In this device 16, the NF membrane can remove salts in the leachate, especially salts of divalent or more negative ions, to the concentrated water side, and can remove most of the organic substances to the concentrated water side. In the separation of ions by NF, not only anions but also cations can be supplemented with divalent or higher ions on the concentrated water side. Conceptually, it has the following separation tendency. Actually, various tendencies are seen depending on the material of the film, its charge and combination, and therefore the following is not always the case. Cation permeated water side Na ⁺ , K ⁺ concentrated water side Ca ²⁺ , Mg ²⁺ , Fe ³⁺ , Mn ⁴⁺ , Pb ²⁺ and other heavy metals anions Permeated water side Cl ⁻ , NO ₃ ⁻ , F ⁻ Concentrated water side SO ₄ ^2- , CO ₃ ^2- , BO ₃ ^3- Other permeated water side Concentrated water side Dioxins, environmental hormones, SiO ₂

The permeated water (filtrate) of the NF filter 16 is introduced into the chelate adsorption tower 18 to remove boron, fluorine, trace amounts of heavy metals and the like. As the chelating agent, polymer resin bodies having functional groups such as iminodiacetic acid type, aminophosphoric acid type, amidoxime type, glucamine type, special metal supporting type, polyamine type, thiourea type and dithiocarbamic acid type are used. To be By these treatments, chelated water has very little impurities and harmful substances, NaC
1 and treated water containing salts mainly containing KCl.

The concentrated water in the NF filter 16 contains divalent ions and larger components, mainly high molecular weight organic substances, dioxin, environmental hormones, and harmful substances such as heavy metals. This concentrated water is returned by the concentrated water return line 20.
The wastewater from the incinerator or the ash melting furnace 10 is sent to the wastewater treatment device 22, and after being treated there, it is returned to the incinerator or the ash melting furnace 10 and sprayed into the furnace to remove harmful substances such as dioxins. Pyrolytically detoxifies. As the discharge treatment device 22, a two-stage coagulation sedimentation treatment + sand filtration treatment system, a coagulation sedimentation treatment + sand filtration treatment + activated carbon adsorption treatment system, or a coagulation sedimentation treatment + biological treatment + coagulation sedimentation treatment + sand filtration treatment A system of + chelate treatment + activated carbon treatment is used.

The treated water subjected to the chelate adsorption treatment is heated by the heater 3.
After being heated at 4, NaCl is crystallized in the crystallization tank 36.
Then, the waste water from the crystallization tank 36 is cooled by the cooler 40, and then KCl is crystallized in the crystallization tank 42. In this case, the heating type crystallizer 38 is constituted by the heater 34 and the crystallization tank 36,
The cooler 40 and the crystallization tank 42 constitute a cooling type crystallizer 44. The drainage outlet 46 of the cooling type crystallizer 44 and the chelate adsorption treatment water conduit 48 on the inlet side of the heating type crystallizer 38 are connected via a drainage return conduit 50, and the discharge is circulated to collect NaCl and KCl. Configured to improve rates. The incineration or ash melting facility 24 is composed of an incinerator or ash melting furnace 10, an emission treatment device 22, and the like, and a waste landfill disposal facility 26 is a landfill disposal site 12, pretreatment device 1.
4, reverse osmosis membrane filtration device 28, NF filtration device 16, chelate adsorption tower 18, heating type crystallization device 38, cooling type crystallization device 4
4 and so on. The effluent water of the cooling type crystallizer 44 is returned to the heating type crystallizer 38 and circulated, and / or reheated as described later to generate a dry salt.

As shown in FIG. 8, the principle of the separation method of NaCl and KCl in a series of crystallizers 38 and 44 is that a heating operation is carried out by utilizing the difference in solubility in water and then a cooling operation is carried out. Go and crystallize. First, in the heating type crystallizer 38, water is evaporated at about 100 to 110 ° C. until just before KCl reaches the saturated solubility, and NaCl is simultaneously precipitated. Next, in the cooling type crystallizer 44, about 10-2
It is cooled to 0 ° C., for example, about 20 ° C., KCl is precipitated, and the waste water is returned to the heating type crystallizer 38. In this way, each is purified into a highly pure NaCl salt and a highly pure KCl salt.

FIG. 2 shows a waste landfill leachate treatment system according to a second embodiment of the present invention. In the present embodiment, the concentrated water from the NF filter 16 is introduced into the thermal decomposition furnace 52 to thermally decompose and detoxify harmful substances such as dioxins and environmental hormones. As the thermal decomposition furnace 52, a kiln type indirect heating furnace, a screw extrusion type indirect heating furnace, a melting furnace or the like in a reducing atmosphere or an oxidizing atmosphere is used. The crude salt from the pyrolysis furnace 52 contains heavy metals and is therefore discarded. In this embodiment, the waste landfill disposal facility 26a is the landfill disposal site 1
2, pretreatment device 14, reverse osmosis membrane filtration device 28, NF filtration device 16, chelate adsorption tower 18, heating type crystallization device 38,
The cooling type crystallizer 44 and the thermal decomposition furnace 52 are included. Other configurations and operations are similar to those of the first embodiment.

FIG. 3 shows a waste landfill leachate treatment system according to a third embodiment of the present invention. In the present embodiment, an electrodeposition device 54 is used instead of the NF filtration device 16 in the first embodiment. 20a is a concentrated water return line. The electrodeposition device 54 has a structure in which a cation exchange membrane having a high selective transmission rate of Na ⁺ and K ⁺ and an anion exchange membrane having a high selective transmission rate of Cl ⁻ are alternately arranged, and an anode and a cathode are provided at both ends. Alternatively, a structure having a combination of ion exchange membranes is used. In the present embodiment, the waste landfill disposal facility 26b includes the landfill disposal site 12, the pretreatment device 1
4, reverse osmosis membrane filtration device 28, electrodeposition device 54, chelate adsorption tower 18, heating type crystallization device 38, cooling type crystallization device 44 and the like. Other configurations and operations are similar to those of the first embodiment.

FIG. 4 shows an apparatus for treating waste landfill leachate according to a fourth embodiment of the present invention. In the present embodiment, an accelerated oxidation treatment device 56 is used instead of the NF filtration device 16 in the first embodiment. As the accelerated oxidation treatment device 56, one having a structure in which a gas-liquid contact device for ozone gas, an irradiation device for ultraviolet rays, a hydrogen peroxide injection device, a catalyst filling device, and the like are combined is used. In the present embodiment, the waste landfill disposal facility 26c is the landfill disposal site 1
2, pretreatment device 14, reverse osmosis membrane filtration device 28, accelerated oxidation treatment device 56, chelate adsorption tower 18, heating type crystallization device 3
8, a cooling type crystallizer 44 and the like. Other configurations and operations are similar to those of the first embodiment.

FIG. 5 shows a treatment equipment for waste landfill leachate according to a fifth embodiment of the present invention. In the present embodiment, the concentrated water from the reverse osmosis membrane filtration device 28 is introduced into the chelate adsorption tower 18 without providing the NF filtration device 16 in the first embodiment, and the water from the heating crystallization device 38 is contained. Introducing NaCl into the thermal decomposition furnace 58 to thermally decompose toxic substances such as dioxins and environmental hormones contained in the NaCl to render them harmless, and to decompose KCl containing water from the cooling type crystallizer 44 into the thermal decomposition furnace 60. Introduced to KCl
The harmful substances such as dioxins and environmental hormones contained in are thermally decomposed to be harmless. As the thermal decomposition furnaces 58 and 60, a kiln type indirect heating furnace, a screw extrusion type indirect heating furnace, a melting furnace or the like in a reducing atmosphere or an oxidizing atmosphere is used. In the present embodiment, the waste landfill disposal facility 26d includes the landfill disposal site 12, the pretreatment device 14, the reverse osmosis membrane filtration device 28, and the chelate adsorption tower 1.
8, heating type crystallizer 38, cooling type crystallizer 44, thermal decomposition furnaces 58, 60 and the like. Other configurations and operations are similar to those of the first embodiment.

FIG. 6 shows a waste landfill leachate treatment system according to a sixth embodiment of the present invention. In the present embodiment, a dryer 62 is provided downstream of the cooling type crystallizing device 44 in the first embodiment, and the cooling type crystallizing device 4 is provided.
The waste water from No. 4 is configured so that the entire amount thereof is recycled, or a part thereof is recycled, and the rest is dried, or the entire amount is dried. In this embodiment,
The waste landfill disposal facility 26e includes a landfill disposal site 12, a pretreatment device 14, a reverse osmosis membrane filtration device 28, an NF filtration device 16, a chelate adsorption tower 18, a heating crystallization device 38, a cooling crystallization device 44, and a dryer. 62 and the like. It is of course possible to apply the present embodiment to the second to fifth forms.

FIG. 7 shows a waste landfill leachate treatment apparatus according to a seventh embodiment of the present invention. In the present embodiment, a part of the waste water from the cooling type crystallizer 44 is returned and circulated in the second embodiment, and the rest is introduced into the thermal decomposition furnace 52 for thermal decomposition. is there. In the present embodiment, the waste landfill disposal facility 26f includes the landfill disposal site 12, the pretreatment device 14, the reverse osmosis membrane filtration device 28,
It is composed of an NF filtration device 16, a chelate adsorption tower 18, a heating type crystallization device 38, a cooling type crystallization device 44, a thermal decomposition furnace 52 and the like. It is of course possible to apply the present embodiment to the first, third to fifth forms.

[0030]

EXAMPLES Examples will be shown below to further clarify the features of the present invention. Example 1 After pre-treating the leachate from the waste landfill site as follows,
The following experiment was conducted. (1) Sodium carbonate, sodium hydroxide, ferric chloride, polymer flocculant, and sodium hypochlorite were added to the pretreated leachate, and the mixture was stirred and mixed to form floc, and after standing, The supernatant water was collected. This was neutralized with hydrochloric acid and filtered with a UF filtration device. Next, the filtrate was evaporated to remove water and concentrated to a salt concentration of about 7% to obtain RO concentrated water. (2) Experimental Method RO concentrated water was boiled in an atmosphere of 110 ° C. to remove water and crystallize NaCl. At this time, KC
The evaporation amount of water was adjusted so that the concentration of 1 did not reach the saturated concentration of KCl, which was previously obtained by the analytical value of each ion concentration and the equilibrium calculation. The crystallized product was suction filtered and evaporated to dryness to obtain sample A. Next, the remaining waste water was cooled and stirred at 20 ° C. The crystallized product that crystallized at this time was suction filtered to obtain Sample B. (3) Experimental results (analysis results) Sample A: NaCl content 96.08% KCl content 1.07%, other 2.85% Sample B: NaCl content 1.97% KCl content 96.63%, Others 1.40% Therefore, it can be seen that these are comparable to the purity of NaCl and KCl imported by each chemical manufacturer.

[0031]

Since the present invention is configured as described above, it has the following effects. (1) When producing dry salt from reverse osmosis membrane filtration concentrated water of landfill leachate, by applying a heating type crystallizer and a cooling type crystallizer, the purity was increased to the same level as the imported salt. ,
For example, NaCl salt and KCl salt each having a purity of 96% or more can be separated and purified. For this reason, it becomes easier to reuse as compared with a conventional dry salt in which both are mixed and which contains many impurities such as heavy metals. The former can be used as industrial salt in the soda industry, and the latter can be used for industrial use or as a fertilizer. (2) Dioxins and environmental hormones contained in the reverse osmosis membrane filtration concentrated water are separated or decomposed by an NF filtration device, an electrodeposition device, an accelerated oxidation treatment device or a thermal decomposition furnace, so they must be included in the purified salt. There is no. (3) The heavy metal contained in the reverse osmosis membrane filtration concentrated water is NF
Since it is separated and removed by a filtration device, an electrodeposition device or a chelate adsorption tower, the amount mixed in the purified salt can be reduced. (4) Fluorine, boron, and a trace amount of heavy metals contained in the reverse osmosis membrane filtration concentrated water are separated and removed by the chelate adsorption tower, so that the amount mixed in the purified salt can be reduced. (5) Power generation and waste heat utilization cogeneration can be achieved by a temperature controller of each crystallization device, each filtration device, an electrodeposition device, an accelerated oxidation treatment device, a thermal decomposition furnace, and the like.

[Brief description of drawings]

FIG. 1 is a systematic schematic configuration diagram showing a treatment apparatus for leachate of waste landfill disposal site according to a first embodiment of the present invention.

FIG. 2 is a systematic schematic configuration diagram showing a treatment device for leachate of waste landfill disposal site according to a second embodiment of the present invention.

FIG. 3 is a systematic schematic configuration diagram showing a treatment apparatus for leachate of waste landfill disposal site according to a third embodiment of the present invention.

FIG. 4 is a systematic schematic configuration diagram showing a treatment device for leachate of waste landfill disposal site according to a fourth embodiment of the present invention.

FIG. 5 is a systematic schematic configuration diagram showing a treatment device for leachate of waste landfill disposal site according to a fifth embodiment of the present invention.

FIG. 6 is a systematic schematic configuration diagram showing a treatment device for leachate of waste landfill disposal site according to a sixth embodiment of the present invention.

FIG. 7 is a systematic schematic configuration diagram showing a treatment device for leachate of waste landfill disposal site according to a seventh embodiment of the present invention.

FIG. 8 is a graph showing saturated solubility curves of NaCl and KCl.

[Explanation of symbols]

10 Incinerator or ash melting furnace 12 Landfill disposal site 14 Pretreatment device 16 NF filtration device 18 Chelate adsorption tower 20, 20a Concentrated water return line 22 Waste water treatment device 24 Incineration or ash melting facility 26, 26a, 26b, 26c, 26d, 26e, 26
f Waste landfill disposal facility 28 Reverse osmosis membrane filtration device 34 Heater 36, 42 Crystallization tank 38 Heating type crystallization device 40 Cooler 44 Cooling type crystallization device 46 Drainage outlet 48 Chelate adsorption treatment water conduit 50 Drainage return conduit 52 , 58, 60 Pyrolysis furnace 54 Electrodeposition device 56 Accelerated oxidation treatment device 62 Dryer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B01D 9/02 619 B01D 9/02 619A C02F 9/00 502 C02F 9/00 502A 502E 502F 502H 503 503C 503G 504 504B 504E // B09B 1/00 B09B 1/00 A C02F 1/00 C02F 1/00 L 1/04 ZAB 1/04 ZABZ 1/58 1/58 HM 1/62 1/62 Z (72) Inventor Eikou Kozo Hyogo 1-1, Kawasaki-cho, Akashi-shi Kawasaki Heavy Industries, Ltd. Inside Akashi Plant (56) Reference JP-A-11-188389 (JP, A) JP-A-5-26427 (JP, A) JP-A-11-209121 ( JP, A) JP 8-215502 (JP, A) JP 2000-84591 (JP, A) JP 11-347591 (JP, A) JP 11-131965 (JP, A) Flat 11-304131 (JP, A) JP flat 10-5714 (JP, A) JP flat 11-216441 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) C02F 1 / 44 B01D 61/00-65/10 B01D 9/00-9/04 C02F 9/00-9/00 504 B09B 1/00

Claims (16)

(57) [Claims] 1. Leachate generated at a landfill site of waste such as waste incinerator or / and ash melting furnace residue is introduced into a reverse osmosis membrane filtration device to be filtered, The permeated water is discharged, the concentrated water of the reverse osmosis membrane filter is introduced into the NF filter and filtered, and the concentrated water of the NF filter is returned to the waste incinerator and / or the ash melting furnace to be harmful in the concentrated water. The material is pyrolyzed, while the permeated water of the NF filtration device is subjected to chelate adsorption treatment, then heated to crystallize the NaCl salt, and then cooled to crystallize the KCl salt. Treatment method of ground seepage water. 2. The reverse osmosis membrane filtration device is provided with the leachate generated at the landfill disposal site of the waste such as the residue of the waste incinerator or / and the ash melting furnace, which is introduced into the reverse osmosis membrane filtration device to be filtered. The permeated water is discharged, the concentrated water of the reverse osmosis membrane filtration device is introduced into the NF filtration device for filtration, and the concentrated water of the NF filtration device is supplied to the thermal decomposition furnace to thermally decompose the harmful substances in the concentrated water. , After permeated water of NF filter is treated with chelate, it is heated to N
A method for treating leachate of waste landfill sites, which comprises crystallizing aCl salt and then cooling to crystallize KCl salt. 3. The reverse osmosis membrane filtration device is provided with the leachate generated at the landfill site of waste such as the residue of the waste incinerator and / or the ash melting furnace, which is introduced into the reverse osmosis membrane filtration device to be filtered. The permeated water is discharged, the concentrated water of the reverse osmosis membrane filtration device is introduced into the electrodeposition device for electrodeposition processing, and the concentrated water of the electrodeposition device is returned to the waste incinerator and / or the ash melting furnace to concentrate water. Noxious substances are decomposed by heat, while the permeated water of the electrodeposition apparatus is subjected to chelate adsorption treatment, and then heated to crystallize NaCl salt, and then cooled to K
A method for treating leachate from a waste landfill site, which comprises crystallization of Cl salt. 4. The reverse osmosis membrane filtration device is introduced with leachate generated at the landfill site of waste such as the residue of the waste incinerator or / and the ash melting furnace, and filtered to remove the leachate. The permeated water is discharged, the concentrated water of the reverse osmosis membrane filtration device is introduced into the accelerated oxidation treatment device to decompose harmful substances, the treated water of the accelerated oxidation treatment device is subjected to chelate adsorption treatment, and then heated to NaC.
A method for treating leachate of landfill waste, which comprises crystallization of l salt and then cooling to crystallize KCl salt. 5. The method for treating leachate of landfill waste according to claim 1, wherein the waste water after cooling to crystallize KCl salt is circulated in the crystallization step of NaCl salt. 6. The waste landfill according to any one of claims 1 to 4, wherein a part of the waste water after cooling to crystallize KCl salt is circulated to a crystallization step of NaCl salt and the rest is dried. Treatment method for leachate from disposal site. 7. The method for treating leachate of waste landfill site according to any one of claims 1 to 4, wherein the waste water after cooling and crystallizing KCl salt is dried. 8. The waste according to claim 1, wherein a part of the waste water after cooling to crystallize the KCl salt is circulated to the crystallization step of the NaCl salt and the rest is thermally decomposed. Treatment method for leachate from landfill sites. 9. A reverse osmosis membrane filtration device for filtering leachate generated at a landfill of waste such as waste incinerator or / and ash melting furnace residue, and concentration of the reverse osmosis membrane filtration device. NF filtration device for filtering water, chelate adsorption tower for chelate adsorption treatment of permeated water of NF filtration device, and supply of concentrated water of NF filtration device to waste incinerator and / or ash melting furnace Concentrated water return line, heating type crystallizer for heating the treated water from the chelate adsorption tower to crystallize NaCl salt, and cooling the treated water of the heating type crystallizer to crystallize KCl salt A cooling type crystallizing device for controlling the leachate of landfill waste landfill. 10. A reverse osmosis membrane filtration device for filtering leachate generated at a landfill of waste such as waste incinerator or / and ash melting furnace residue, and concentration of the reverse osmosis membrane filtration device. An NF filtration device for filtering water, a chelate adsorption tower for chelating and adsorbing permeated water of the NF filtration device, and a pyrolysis furnace for introducing concentrated water of the NF filtration device and thermally decomposing harmful substances. A heating type crystallizer for heating the treated water from the chelate adsorption tower to crystallize the NaCl salt, and a cooling type crystal for cooling the treated water of the heating type crystallizer to crystallize the KCl salt An apparatus for treating leachate of waste landfill disposal site, comprising: 11. A reverse osmosis membrane filtration device for filtering leachate generated at a landfill site of waste such as residues of a waste incinerator or / and an ash melting furnace, and concentration of the reverse osmosis membrane filtration device. Electrodeposition apparatus for water electrodeposition treatment, chelate adsorption tower for chelate adsorption treatment of permeated water of the electrodeposition apparatus, and concentrated water of the electrodeposition apparatus is supplied to the waste incinerator and / or ash melting furnace A concentrated water return line for heating, a heating type crystallizer for heating the treated water from the chelate adsorption tower to crystallize the NaCl salt, and cooling the treated water for the heating type crystallizer to remove the KCl salt. A cooling type crystallizing device for crystallization, and a treatment device for leachate of landfill waste landfill. 12. A reverse osmosis membrane filtration device for filtering leachate generated at a landfill site for waste such as waste incinerator or / and ash melting furnace residue, and concentration of the reverse osmosis membrane filtration device. An accelerated oxidation treatment device for introducing water to decompose harmful substances, a chelate adsorption tower for chelating adsorption treatment of the treated water of the accelerated oxidation treatment device, and heating the treated water from the chelation adsorption tower to generate NaCl. Disposal comprising a heating type crystallizer for crystallizing a salt and a cooling type crystallizer for cooling treated water of the heating type crystallizer to crystallize KCl salt Leachate treatment equipment for landfill disposal sites. 13. A drainage outlet of the cooling type crystallizer and a chelate adsorption treatment water conduit on the inlet side of the heating type crystallizer so that the drainage from the cooling type crystallizer can be circulated to the heating type crystallizer. The treatment apparatus for leachate of waste landfill disposal site according to any one of claims 9 to 12, which is connected by a drainage return conduit. 14. A chelate adsorption-treated water at the outlet of the cooling type crystallizer and the inlet side of the heating type crystallizer so that a part of the wastewater from the cooling type crystallizer can be circulated to the heating type crystallizer. 13. The leachate from the waste landfill site according to any one of claims 9 to 12, wherein a dryer is provided downstream of the cooling type crystallizer so that the remaining portion of the wastewater can be dried by connecting the conduit with a wastewater return conduit. Processing equipment. 15. The leachate for waste landfill disposal according to claim 9, wherein a dryer is provided downstream of the cooling type crystallizer so that the drainage water from the cooling type crystallizer can be dried. Processing equipment. 16. A chelate adsorption-treated water at a drain outlet of the cooling type crystallizer and an inlet side of the heating type crystallizer so that a part of the drainage water from the cooling type crystallizer can be circulated to the heating type crystallizer. The drainage pipe is connected to a conduit by a drainage return conduit, and the drainage pipe is connected to a pyrolysis furnace so that the remainder of the drainage can be thermally decomposed.
12. The treatment apparatus for leachate of waste landfill disposal site according to any one of to 12.