JP5159585B2 - Organic wastewater treatment method and treatment equipment - Google Patents

Description

  The present invention relates to a method and equipment for treating organic sewage such as rice sharpening juice and waste liquid from a tofu factory.

  A large amount of organic sewage such as rice sharpening juice is generated every day at school facilities and hospitals. A large amount of organic sewage is also generated at the tofu factory. These organic sewage has a relatively low concentration but a large amount of sewage is generated, requiring a large treatment facility. For example, for tofu production, it is said that 5 tons of water per 1 ton of soybean, and even a medium-sized manufacturer must treat about 100 tons of sewage every day.

  Usually, organic substances are precipitated using chemicals such as flocculants and the supernatant liquid is drained, but the amount of chemicals used is large due to the large amount of waste liquid to be produced, and food production There are many impacts on costs. Moreover, although a deposit may be used for a landfill etc., since many are reduced by incineration processing, a huge energy cost is required.

  There is a method of removing SS (floating matter amount) with a filter, but mechanical filters such as mesh cannot be filtered because the particles are fine, and the use of elements such as cloth makes the amount of liquids large, so the amount of facilities is enormous. There is a problem that it becomes a thing.

  The filter described in Patent Document 1 forms a minute projection on the surface of a coil spring-shaped material such as metal to form a gap, applies a filter aid such as diatomaceous earth to the surface of the material, and passes through the gap. It is designed to filter fine suspensions in the liquid that is flowing, but it is difficult to maintain the gap between the coil springs at a predetermined size, and the spring resonates due to vibration of the liquid flow, etc. There are problems such as being unable to do so.

  On the other hand, the present inventor invented a heat insulating material in which a pulverized garnet and an inorganic binder are mixed and filled in a mold, fired, foamed and molded, and the contents thereof are disclosed in Patent Document 2. . Since this plate-like heat insulating material is formed from foamed garnet, since the internal voids are large and the air permeability is the same, the water permeability is the same. It has also been suggested to be used as a filter.

  Furthermore, the present applicant dilutes the organic sludge with water as necessary, performs aeration treatment, passes through a filtration reaction tank filled with Merton chips, and further circulates the effluent to convert the organic matter into carbon dioxide. An organic sludge treatment method and treatment equipment that completely decomposes into water and does not produce a residue have been developed, and the contents thereof are described in Patent Document 3, which will be briefly described with reference to FIG.

  FIG. 6 is a system diagram showing an organic sludge treatment facility described in Patent Document 3. Reference numeral 91 is an adjustment tank, reference numerals 92 to 94 are aeration tanks, reference numerals 95 and 97 are transfer pumps, reference numeral 96 is a filtration reaction tank, reference numeral Reference numeral 961 denotes a submerged pipe for submerging the liquid on the surface of the filtration reaction tank 96, and reference numeral 962 denotes an outflow trough for collecting the effluent from the bottom of the filtration reaction tank 96.

  The organic sludge is introduced into the adjustment tank 91 while being diluted with water as necessary, and then transferred to the aeration tanks 92 to 94 for aeration treatment, and then the treatment liquid is added to the filtration reaction tank 96 filled with Merton chips. When sprayed on the surface and passed through the tank, the discharged liquid is returned to the adjusting tank 91 and this route is repeatedly circulated, the organic matter is completely decomposed into carbon dioxide and water, and no residue is produced. According to actual results, the temperature of the circulating liquid is about 30 ° C. due to the action of microorganisms attached to the Merton chip, and about 60% of the sludge is decomposed in 24 hours.

  Merton chips are pulverized “butter material” obtained by crushing cedar wood into a size of 0.5 to 4.0 mm as described in paragraph [0008] of Patent Document 3, and about 65% cellulose. , About 10% hemicellulose pentosan and about 20% lignin. The Merton chip functions here as a filter for filtration and as a carrier for microorganisms that perform fermentation, decomposition and digestion reactions. It is rich in water retention, draining, and heat retention, especially excellent in deodorizing power and fermentation power, and is optimal as a contact material for digestion of organic sludge.

Japanese Patent No. 3124901 JP 2004-69060 A Japanese Patent No. 4030496

  The present invention solves the above-mentioned problems in the prior art, and firstly, it makes it possible to discharge a large amount of sewage containing organic matter without using chemicals and without unstable elements related to the filter. It is an object of the present invention to provide an organic wastewater treatment method and treatment equipment that achieves the following two points: complete decomposition of the filtered residual liquid and detoxification.

The present invention according to claim 1, the water receiving Ikeuchi accept organic sewage, filled in the mold by mixing a powdered grinding the garnet and the inorganic binder, firing the foam, board-like obtained by molding comprising a porous material, or ground that garnet fired by foaming a an inorganic binder filling the mold frame heated compressed, full Note1 made of a porous material like were molded board After draining the drained water sucked from inside the filtration tank, the filtration residual liquid in the receiving pond is put into the adjustment tank, and then transferred to the aeration tank to perform the aeration treatment, and then the treatment by spraying a liquid to the filtration reactor surface filled with Merton tip is passed through the filtration reactor is the method for processing an organic sewage you characterized thereby repeatedly cycled back to the effluent in the adjusting tank .

The present invention according to claim 2 mixes a receiving pond that receives organic sewage, a side surface set in the receiving pond, or a garnet crushed on at least one of the bottom surface and an inorganic binder into a formwork. A board-shaped porous material that has been fired, foamed and molded, or a baked and foamed garnet and an inorganic binder filled in a mold, heated, and compressed and molded And a suction means for sucking out and discharging the liquid contained in the filter, a means for pumping the filtrate remaining in the receiving pond, and the means from the receiving pond. An adjustment tank that receives the filtered residual liquid pumped out by a plurality of aeration tanks, a plurality of aeration tanks that perform aeration processing, a submerged pipe that sprays drainage liquid from the plurality of aeration tanks, and the drainage liquid sprayed by the submerged pipe Accept mart A filtration reaction tank filled with chips, and connected in series in this order in a closed circuit that goes round from the adjustment tank to the filtration reaction tank, and the effluent treated in the filtration reaction tank is repeatedly circulated in the circuit organic sewage treatment facility, characterized that you made by configured filtered residual liquid processing means so as to.

According to the present invention, SS, BOD, and COD can be stably removed from a large amount of organic sewage without using chemicals and without incineration, enabling the discharge of sewage, which is the first problem, and operating costs. Is greatly reduced. Also, as the organic matter of retentate liquid harmless completely decomposed into carbon dioxide and water vapor, it exhibits the both excellent effect.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view showing the simplest configuration which should be called the principle of the present invention. Reference numeral 1 is a filter, reference numeral 11 is a filter constituting the bottom surface, and reference numeral 2 is a drain pipe from which organic sewage is discharged. .

  As the filter 11, the plate-shaped heat insulating material described in Patent Document 2 is used. In the present invention, since there is no particular purpose of heat insulation, the name “molded board” will be used hereinafter. Again, this is done by mixing pulverized garnet and an inorganic binder, filling the mold, firing and foaming, molding board-like porous material, or pulverizing garnet This is a board-like porous material in which a foamed product and an inorganic binder are filled in a mold, heated, compressed and molded. In other words, garnet may be crushed and used as a raw material, or baked and foamed crushed garnet is sold under the name of “Perlite” as an agricultural drainage material. Also good. The filter performance (mesh roughness) of the molded board is estimated to be about 20 μm.

  FIG. 2 shows the results of processing rice sharpening juice with such an apparatus and examining the water quality before and after the treatment. This inspection was conducted according to JIS K0102 item 17 for COD, JIS K0101 items 21 and 32.3 for BOD, and SS according to Annex 8 of the Environmental Agency Notification No. 59 of 1966. From the results shown in FIG. 2, it can be seen that the filter 11 has removed all SS, BOD, and COD of the organic sewage to a level that can be discharged into the sewer. In addition, when bacteria or the like becomes a problem, it may be discharged after appropriately sterilizing or sterilizing.

  FIG. 3 embodies the apparatus shown in FIG. 1. Reference numeral 12 denotes a wire mesh, reference numeral 13 denotes a frame, and reference numeral 14 denotes an upper plate. The filter 1 of this embodiment uses a molded board as the filter 11 on the four side surfaces and the bottom surface. For example, many molded boards having a size of 610 mm × 910 mm and a thickness of 20 mm are manufactured for building materials. However, since they can be easily cut with a cutter knife or the like, they may be used in any size. The thickness can also be changed in various ways by overlapping the number. If there is a possibility that the strength is insufficient with respect to the water pressure, such as when the molded board is used in a large size or when the thickness is small, the wire mesh 12 may be applied to one side or both sides as shown in FIG. In terms of durability, it is also desirable to make the frame body 13 of stainless steel or the like and fit the molding board on it. Although the drain pipe 2 is directly attached to the upper plate 14, the suction pipe 3 may be attached in place of the drain pipe 2 as in the example shown later.

  In addition, when a plurality of molded boards are stacked, at least one mating surface is cut, and the resulting space is filled with filter aids such as activated carbon, shell powder, river sand, and the above pearlite powder, filter performance In addition, the filter can be provided with new functions such as sterilization and adsorption.

  Fig. 4 is a structural cross-sectional view showing an organic sewage receiving portion in an actual organic sewage treatment facility. In addition to what has been shown so far, reference numeral 15 is a frame for supporting filtration 1, reference numeral 3 is a suction pipe, reference numeral Reference numeral 31 denotes a suction pump, and reference numeral 4 denotes a receiving pond for receiving organic sewage. A stirring means may be provided in the receiving reservoir 4 as necessary.

  The organic sewage is once received from the drain pipe 2 into the receiving basin 4. If the amount of organic sewage generated is 100 tons per day, the capacity of the receiving pond should be about 300 tons. The filter 1 shown in FIG. 3 is submerged in the liquid, and the liquid flowing through the filter 11 into the inside is sucked out by the suction pipe 3. That is, contrary to that shown in FIG. 1, the liquid is filtered from the outside of the filter 1 and collected inside, and filtered by the suction pump 31 such as a vacuum pump. This is the suction means for sucking the filtrate that can be discharged.

In this configuration, the entire filter 1, particularly the upper plate 14 and the suction pipe 3 must be connected in an airtight structure. Since the filter 11 is clogged with the passage of time, a pressurizing pipe (not shown) is connected and filtered at an appropriate timing so that the inside of the filter 1 is brought to a positive pressure and the filter 11 is backwashed. Since the filtrate sucked out from the suction pipe 3 has removed harmful substances, it can be discharged into the sewer as it is.

  If the operation is continued as it is, the liquid in the receiving basin 4 is gradually concentrated, and this must be appropriately treated. FIG. 5 is a block diagram showing the treatment facility for the whole organic wastewater including the treatment of the liquid in the receiving basin 4, and the reference numeral 5 is the one shown in the previous drawings, and the reference numeral 5 is the pump for the liquid in the receiving pond 4. A pumping pipe 51 is a pumping pump. The pump 51 need not always be operated, and in some cases, the pump may not be used and may be pumped manually with a bucket or the like.

  The concentrated waste liquid pumped out is put into the adjustment tank 91 previously shown in FIG. 6, but unlike the case of organic sludge shown in Patent Document 3, there is almost no need to dilute with water at the time of charging. The subsequent processing steps are exactly the same as those described in Patent Document 3, and in the present invention, the entire processing equipment after the pumping pipe 5 is the filtration residual liquid processing means. Both the filtration residue and the filtration residual liquid are rendered harmless, and the entire organic wastewater is stably treated at low cost.

As a filter, only a rectangular board has been illustrated, but as described above, this molded board can be freely cut with a cutter knife or the like, so that it can be cut into a circle or any other shape depending on the design.
Further, the boards may be used vertically with respect to the side surfaces, or the boards cut into strips may be stacked vertically.

It is explanatory drawing which shows the simplest Example of this invention. It is a table | surface which shows collectively the test result performed in order to confirm the purification effect by this invention. It is explanatory drawing which shows one of the Examples of this invention. It is a composition sectional view showing the organic sewage acceptance part of the example of the present invention. It is a block diagram which shows the processing equipment of the whole organic waste water of the Example of this invention. It is a systematic diagram showing the treatment facility for organic sludge described in Patent Document 3.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Filtration, 2 ... Drain pipe, 3 ... Drain pipe, 4 ... Receiving pond, 5 ... Drain pipe, 11 ... Filter, 12 ... Wire mesh, 13 ... Frame body, 14 ... Upper plate, 15 ... Base, 31 ... Dump Pump, 51 ... Pumping pump, 91 ... Adjusting tank, 92, 93, 94 ... Aeration tank, 95, 97 ... Transfer pump, 96 ... Filtration reaction tank, 961 ... Submerged pipe, 962 ... Outflow tank.

Claims (2)

A water receiving Ikeuchi accept organic sewage, filled in the mold by mixing the garnet and inorganic binder were pulverizng, foamed and sintered, shaped was molded board porous material, or ground garnet an and firing the inorganic binder that is foamed and filled heating the mold frame compression, filtering masses which include the full Note1 made of a porous material like board was formed was sinking, in the filtration masu The waste water sucked from the tank is discharged, and the filtration residual liquid in the receiving pond is put into the adjustment tank, and then transferred to the aeration tank for aeration treatment, and then the treatment liquid is filled with the Merton chip. and spray is passed through the filtration reactor in the surface treatment method of organic wastewater you characterized thereby repeatedly cycled back to the effluent in the adjustment tank. A receiving pond that receives organic sewage, a side surface set in the receiving pond, or a garnet that has been crushed on at least one side of the bottom and an inorganic binder are mixed together and filled into a mold, fired, foamed, and molded. board-shaped porous material, or ground garnet was filled with calcined to the one obtained by foaming an inorganic binder in a mold frame heated compressed, and a porous material of board-like obtained by molding When filtered, the suction means for sucking out and discharging the liquid in the filtered mass, the means for pumping the filtered residual liquid in the receiving pond, and the filtered residual liquid pumped by the means from the receiving pond Filtration reaction filled with an adjustment tank for receiving, a plurality of aeration tanks for performing aeration treatment, a submerged pipe for spraying drainage liquid from the plurality of aeration tanks, and a Merton chip for receiving the drainage liquid sprayed by the submerged pipe A filtration circuit configured to repeatedly circulate the waste liquid treated in the filtration reaction tank and connected in series in this order in a closed circuit that goes around the adjustment tank and the filtration reaction tank. organic sewage treatment facilities it characterized by comprising the residual liquid treatment unit.

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