Method for treating organic matter-containing water and apparatus for treating organic matter-containing water

Abstract

To provide a method for treating organic matter-containing water and an apparatus for treating organic matter-containing water capable of reducing an amount of sludge generated by biological treatment or coagulation treatment and reducing cost associated with sludge volume reduction.SOLUTION: Provided are: a method for treating organic matter-containing water including applying biological treatment to a part of the organic matter-containing water to obtain biological treated water, applying coagulation treatment and solids removal treatment to the biological treated water to obtain coagulated treated water and sludge, applying wet filtration treatment to the coagulated treated water to obtain filtered treated water, applying reverse osmosis membrane treatment to the filtered treated water to obtain concentrated water and permeate water, and diluting the sludge with the remainder of the organic matter-containing water to obtain diluted sludge; and an apparatus for treating organic matter-containing water configured so as to perform the method.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for treating organic matter-containing water and an apparatus for treating organic matter-containing water. More specifically, the present invention relates to a method for treating organic matter-containing water and an apparatus for treating organic matter-containing water, which can reduce the amount of sludge produced by biological treatment or coagulation treatment and reduce the costs associated with reducing the volume of sludge. [Background technology]

[0002] Biological treatment of organic matter-containing water (organic wastewater) is often performed. The water obtained by biological treatment of organic matter-containing water (organic wastewater) contains a large amount of dissolved and suspended matter produced by biological metabolism. The water obtained by biological treatment is subjected to coagulation treatment or other processes to turn the dissolved and suspended matter into solid matter, and then the solid matter (floating sludge (scum) or precipitated sludge) is removed by solid-liquid separation to obtain water that meets the effluent water quality standards or to obtain reusable water. The water that has been subjected to coagulation treatment also contains solid matter derived from the coagulant. The removed solid matter is collected as sludge. Since sludge contains a large amount of water, it is subjected to volume reduction processes such as concentration treatment, dehydration treatment, drying and incineration treatment, and then it is disposed of in landfills or used as cement raw material.

[0003] In order to improve the efficiency of biological treatment, coagulation treatment, solid-liquid separation treatment and the like, various methods for treating water containing organic matter have been proposed. For example, Patent Document 1 discloses a method for treating organic wastewater, in which organic wastewater is introduced into a biological treatment tank for aerobic biological treatment, and an inorganic coagulant is added to the biological treatment water flowing out from the outlet of the biological treatment tank for coagulation treatment, characterized in that the pH of the biological treatment water in the outlet region of the biological treatment tank is set to 7.3 or less.

[0004] Patent Document 2 discloses a method for treating water containing organic matter and calcium, which comprises treating the water containing organic matter and calcium in a decarbonation device and a softener, and then treating the water with a reverse osmosis membrane under alkaline conditions.

[0005] Patent Document 3 discloses a method for treating organic matter-containing water, in which the organic matter-containing water is separated into concentrated water and treated water by an organic matter-containing water separation means such as membrane treatment using an ultrafiltration membrane, and the concentrated water is biologically treated in a microbial fuel cell.

[0006] Patent Document 4 describes a system that includes a biological treatment process in which reaction tanks filled with carriers holding microorganisms are arranged in series in two or more stages, and organic matter-containing water is biologically treated under aerobic conditions, and an inflow process in which a portion of the organic matter-containing water is bypassed and inflowed into a subsequent reaction tank without passing through a previous reaction tank, and in the inflow process, the BOD volume load of each of the reaction tanks is set to 0.5 kg / (m 3 The present invention discloses a water treatment method, characterized in that the amount of the organic matter-containing water flowing into the bypass is controlled so that the amount of the organic matter-containing water flowing into the bypass is equal to or greater than d). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2007-38107 A [Patent Document 2] JP 2020-157223 A [Patent Document 3] WO 2016 / 136957 A1 [Patent Document 4] Patent Publication No. 2022-122572 Summary of the Invention [Problem to be solved by the invention]

[0008] From the viewpoint of global environmental conservation, it is recommended to obtain water that meets effluent water quality standards from organic matter-containing water, or to obtain reusable water and recycle it. Sludge is generated by biological treatment or coagulation treatment to obtain reusable water from organic matter-containing water. Reducing the volume of sludge requires a large amount of cost. Therefore, an object of the present invention is to provide a method for treating organic matter-containing water and an apparatus for treating organic matter-containing water, which can reduce the amount of sludge generated by biological treatment or coagulation treatment and reduce the cost related to reducing the volume of sludge. [Means for solving the problem]

[0009] As a result of investigations conducted in order to achieve the above object, the present invention including the following embodiments has been completed. [1] A portion of the organic matter-containing water is subjected to biological treatment to obtain biologically treated water; The biologically treated water is subjected to a coagulation treatment and a solid matter removal treatment to obtain coagulated treated water and sludge; The coagulation treated water is subjected to wet filtration to obtain filtered water; The filtered water is subjected to a reverse osmosis membrane treatment to obtain a concentrated water and a permeate water. diluting the sludge with the remainder of the organic matter-containing water to obtain diluted sludge; Including, Method for treating water containing organic matter.

[0010] [2] The method for treating organic matter-containing water according to [1], further comprising diluting the sludge with concentrated water.

[0011] [3] Measure the amount of suspended solids in the diluted sludge; The method for treating organic matter-containing water according to [1] or [2], further comprising adjusting a dilution ratio of the sludge based on the measured amount of suspended solids.

[0012] [4] The method for treating organic matter-containing water according to [1], [2] or [3], further comprising discharging the diluted sludge into a sewer, a river, an ocean, a lake, a swamp or a pond.

[0013] [5] The method for treating organic matter-containing water according to [1], [2], [3] or [4], further comprising using the permeate water for facility use, agricultural use, industrial use or municipal use.

[0014] [6] A biological treatment device configured to perform biological treatment; A flocculation treatment device configured to perform flocculation treatment and solid matter removal treatment; A wet filtration treatment device configured to perform wet filtration treatment; a reverse osmosis membrane treatment device configured to perform reverse osmosis membrane treatment; a sludge dilution treatment device configured to dilute sludge to obtain diluted sludge; a main flow path configured to allow liquid to flow sequentially from an organic matter-containing water source to a biological treatment device, from the biological treatment device to a coagulation treatment device, from the coagulation treatment device to a wet filtration treatment device, and from the wet filtration treatment device to a reverse osmosis membrane treatment device; A sludge transport flow path configured to allow sludge to flow from the coagulation treatment device to the sludge dilution treatment device; and A sub-flow passage configured to allow liquid to flow from an organic matter-containing water source to a sludge dilution treatment device without passing through a biological treatment device, a coagulation treatment device, a wet filtration treatment device, and a reverse osmosis membrane treatment device. An apparatus for treating organic matter-containing water, comprising:

[0015] [7] The sludge dilution treatment device has a dilution treatment tank, The organic matter-containing water treatment device according to [6], wherein the downstream end of the sub-channel is connected so as to communicate with a dilution treatment tank or a sludge transport channel.

[0016] [8] An SS measurement device configured to measure the amount of suspended solids; a flow rate adjusting device configured to adjust the amount of liquid flowing through the secondary flow path; a control device configured to control a flow rate control device based on the amount of suspended solids measured by the SS measuring device; The organic matter-containing water treatment device according to [6] or [7], further comprising: Effect of the Invention

[0017] The method for treating organic matter-containing water and the apparatus for treating organic matter-containing water of the present invention generate less sludge by biological treatment or coagulation treatment than the conventional method and apparatus, so that the equipment cost and operating cost for reducing the volume of sludge can be reduced. As a result, the method for treating organic matter-containing water and the apparatus for treating organic matter-containing water of the present invention can provide water that meets the effluent water quality standards or reusable water at low cost. In the method for treating organic matter-containing water and the apparatus for treating organic matter-containing water of the present invention, the organic matter-containing water is distributed between biological treatment and dilution treatment, so that the amount of water subjected to biological treatment, coagulation treatment, wet filtration treatment, and reverse osmosis membrane treatment is reduced. This also reduces the equipment cost and operating cost for biological treatment, coagulation treatment, wet filtration treatment, and reverse osmosis membrane treatment. [Brief description of the drawings]

[0018] [Figure 1] 1 is a conceptual diagram showing one embodiment of an organic matter-containing water treatment device of the present invention. [Diagram 2] FIG. 2 is a conceptual diagram showing another embodiment of the organic matter-containing water treatment device of the present invention. [Diagram 3] FIG. 2 is a conceptual diagram showing another embodiment of the organic matter-containing water treatment device of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The method for treating organic matter-containing water of the present invention includes the steps of biological treatment, coagulation treatment and solid matter removal treatment, wet filtration treatment, reverse osmosis membrane treatment and dilution treatment. The organic matter-containing water treatment device of the present invention further includes a biological treatment device 1, a coagulation treatment device 2, a wet filtration treatment device 3, a reverse osmosis membrane treatment device 4, a sludge dilution treatment device, main flow paths 18, 16, 14, 17, a sludge transport flow path 13, and a sub-flow path 15.

[0020] The organic matter-containing water 8 usually contains dissolved organic matter and suspended organic matter (solid matter). The organic matter-containing water 8 has a suspended solid content of preferably 80% or less of the upper limit of the effluent quality standard, more preferably 50% or less of the upper limit of the effluent quality standard, and even more preferably 20% or less of the upper limit of the effluent quality standard. For example, the effluent quality standard for the suspended solid content in a sewer is 70 mg / l or less, the effluent quality standard for the suspended solid content in an agricultural village sewage facility is 50 mg / l or less, and the effluent quality standard for the suspended solid content in a sewage terminal treatment plant or a sewage treatment facility with 501 or more people to be treated is 200 mg / l or less.

[0021] Examples of organic matter-containing water include wastewater from electronics industry, chemical plant, and food plant. In particular, in the electronic component manufacturing process, a large amount of different types of organic matter-containing water are discharged from the development process, the stripping process, the etching process, the cleaning process, and the like. Examples of organic matter contained in the organic matter-containing water include alcohols such as isopropyl alcohol and ethyl alcohol; organic nitrogen or ammonia nitrogen such as monoethanolamine and tetramethylammonium hydroxide; and organic sulfur compounds such as dimethyl sulfoxide. The pH of the wastewater described above can be adjusted so as to conform to the effluent water quality standards. The organic matter-containing water source may be a buffer tank or a catchment basin configured to collect and temporarily store the organic matter-containing water (organic wastewater) described above, or a catchment channel configured to collect and flow the organic matter-containing water (organic wastewater) described above.

[0022] Biological treatment involves the decomposition of organic matter contained in organic matter-containing water by microorganisms. The microorganisms take in the organic matter as food, decompose it in their bodies, and use it as energy. Microorganisms are broadly classified into aerobic microorganisms that can only survive under conditions where oxygen is present, and anaerobic microorganisms that can survive under conditions where oxygen is not present. The activated sludge process is one method of biological treatment that uses aerobic microorganisms. Examples of anaerobic microorganisms include methanogens, hydrogen producers, sulfate reducers, denitrifiers, and electricity-generating bacteria (e.g., ATCC700550, ATCC51573, etc.). Regardless of which microorganisms are used, new solid matter is produced as dregs during the decomposition of organic matter, which tends to increase the amount of sludge.

[0023] Examples of the biological treatment device 1 include a biological reaction tank and a device containing microorganisms suspended in the biological reaction tank (floating type device), and a biological reaction tank, a carrier stored in the biological reaction tank, and a device containing microorganisms attached to the carrier (biofilm type device). The carrier to which the microorganisms are attached may be fixed in the biological reaction tank (fixed bed), may be fluidized in the biological reaction tank (fluidized bed), or may be moved in the biological reaction tank (moving bed). Activated carbon, plastic, sponge, etc. can be used as the carrier. Of these, a carrier made of sponge is preferable. When aerobic microorganisms are used, it is preferable to further include an aeration device (aerator) or an aeration device (diffuser). The biological treatment device may have only one biological reaction tank (single tank type) or two or more biological reaction tanks (multi-tank type). In the multi-tank type or the single tank type with a partition in the biological reaction tank, biological treatment can be performed in multiple stages.

[0024] In biological treatment, it is preferable to adjust the pH. When organic nitrogen, ammonia nitrogen, or organic sulfur compounds contained in organic matter-containing water are biologically treated, acids such as nitric acid, nitrous acid, and sulfuric acid are generated, and the pH decreases. If the pH decreases too much, the activity of microorganisms may decrease, so it is preferable to adjust the pH so that it is maintained at 7.5 to 8.5. From the viewpoint of efficiency of the subsequent coagulation treatment process, the pH of the biologically treated water (water discharged from the biological treatment device 1) is preferably adjusted to 6.5 to 7.3, more preferably 6.5 to 7.1, and even more preferably 6.5 to 6.9. By lowering the pH of the biologically treated water, efficient coagulation treatment may be achieved even with the addition of a small amount of coagulant or flocculant. To adjust the pH, water-soluble alkali metal compounds such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, etc.; mineral acids such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, etc.; and the like can be used.

[0025] The flocculation treatment usually involves adding a coagulant or flocculant to the biological treatment water and stirring it to make the solids more likely to flocculate and float or settle. The flocculation treatment device 2 includes, for example, a flocculation tank and a supply flow path, and further includes a configuration capable of performing a solid matter removal process. Note that a configuration capable of performing a solid matter removal process (a region corresponding to a pressurized flotation tank or a sedimentation tank) may be provided in the flocculation tank, or a configuration capable of performing a solid matter removal process (a pressurized flotation tank or a sedimentation tank) may be provided separately from the flocculation tank. The flocculation treatment device may have only one flocculation tank (single tank type) or two or more flocculation tanks (multiple tank type). In the multi-tank type or single tank type with a partition in the flocculation tank, flocculation treatment can be performed in multiple stages, or flocculation treatment can be performed in the first stage and solid removal treatment can be performed in the second stage. The coagulant or flocculant 7 can be transferred, for example, from a storage tank (not shown) through a supply flow path to the coagulation tank of the coagulation treatment device 2. The biologically treated water can be transferred to the coagulation tank of the coagulation treatment device 2 through the biologically treated water transport pipe 16. The transfer amounts of the coagulant or flocculant and the biologically treated water can be adjusted using a level gauge installed in the coagulation tank, and valves, flow meters, pumps, and the like installed in each pipe. A means for stirring the added coagulant or flocculant so that it spreads throughout the coagulation tank can be installed in the coagulation tank. The storage tank is configured to store the coagulant or flocculant. The storage tank may also be further configured to dissolve or disperse a solid or liquid coagulant or flocculant in water to form a solution or dispersion of the coagulant or flocculant at a predetermined concentration.

[0026] The coagulant is not particularly limited as long as it is a substance that promotes the formation of microflocs. Examples of inorganic coagulants include aluminum-based coagulants such as aluminum sulfate (aluminum sulfate), PAC (polyaluminum chloride), aluminum chloride, basic aluminum chloride, and pseudoboehmite alumina sol (AlO(OH)); iron-based coagulants such as polyiron (polyferric sulfate), ferrous hydroxide, ferrous sulfate, ferric chloride, and iron-silica inorganic polymer coagulants; zinc-based coagulants such as zinc chloride; and activated silicic acid; examples of organic coagulants include polyamines and polydadomac. Among these, inorganic coagulants are preferred, and iron-based coagulants are more preferred.

[0027] The flocculant is not particularly limited as long as it is a substance that promotes the transformation of microflocs into coarse flocs. Examples of the flocculant include polymer flocculants made of anionic polymers, cationic polymers, amphoteric polymers, nonionic polymers, etc. Such polymers preferably have a weight average molecular weight of more than 1 million, more preferably 5 million or more.

[0028] When the flocculation treatment is performed in multiple stages, it is preferable to add a flocculant in the first stage and a flocculant in the second stage. When the flocculation treatment is performed in one tank, it is preferable to add a flocculant to the area of ​​the flocculation tank where the biologically treated water flows in, and to add a flocculant to the area where the solid removal treatment is performed. The addition of a flocculant or flocculant tends to generate new solids and increase the amount of sludge.

[0029] In the coagulation treatment, it is preferable to adjust the pH. When an iron-based coagulant is added, it is preferable to adjust the pH to 5.5 or less and carry out the coagulation reaction. When an aluminum-based coagulant is added, it is preferable to adjust the pH to 5.0 or less and carry out the coagulation reaction, and then adjust the pH to 6.0 or more. To adjust the pH, water-soluble alkali metal compounds such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate; mineral acids such as hydrochloric acid, sulfuric acid, nitric acid, and phosphoric acid; and the like can be used.

[0030] The solid removal process includes removing the solids that have been coagulated and floated or that have been coagulated and settled to obtain coagulated treated water. Coagulation and flotation can be performed in a pressurized flotation tank or a region in the coagulation tank that corresponds to the pressurized flotation tank, and coagulation and settling can be performed in a settling tank or a region in the coagulation tank that corresponds to the settling tank. The coagulated and floated solids (floated sludge or scum) are floated in a pressurized flotation tank, separated by a scum skimmer, float weir, float pump, or the like, and discharged as sludge outside the system. The coagulated and settled solids (settled sludge) are deposited in a settling tank, and the supernatant liquid (coagulated treated water) in the settling tank is separated by decantation or the like. The sediment can be scraped out or sucked out by a pump or the like and discharged as sludge outside the system. The discharged sludge can be transported to the sludge dilution treatment device via the sludge transport flow path 13. The sludge can also be temporarily stored in the sludge buffer tank 6, which is a part of the sludge transport flow path 13.

[0031] To the extent that diluted sludge that satisfies the effluent water quality standards can be obtained by diluting the discharged sludge with organic matter-containing water for dilution and / or with concentrated water from a reverse osmosis membrane device described below, there is no need to subject the discharged sludge to volume reduction treatment. This makes it possible to save costs associated with volume reduction treatment. The volume reduction treatment includes treatments such as dehydration and drying. When a quantity of sludge is generated that is so large that it is not possible to obtain diluted sludge that satisfies the effluent water quality standards even by dilution with organic matter-containing water for dilution and / or dilution with concentrated water from the reverse osmosis membrane device, or when there is a possibility that such a quantity of sludge will be generated, the distribution of organic matter-containing water is adjusted so as to reduce the amount of organic matter-containing water exposed to biological treatment and increase the amount of organic matter-containing water for dilution. Also, the amount of sludge generated in biological treatment can be adjusted by changing the distribution of organic matter-containing water to biological treatment and dilution treatment.

[0032] The wet filtration process involves passing the coagulated water through a filter to remove solids that were not completely removed by the solid removal process, thereby obtaining filtered water. The wet filtration device includes filters such as a sand filter, a double-layer filter (using sand and anthracite as a filter carrier), an ultrafilter, a microfilter, etc. The wet filtration device may have only one filter or may have two or more filters.

[0033] The reverse osmosis membrane process involves subjecting filtered water to a reverse osmosis membrane process to obtain a concentrate and a permeate. The reverse osmosis membrane treatment device includes, for example, a tubular container and a reverse osmosis membrane that divides the inside of the tubular container into a concentrated water flow path and a permeated water flow path. As the reverse osmosis membrane treatment device, a spiral type reverse osmosis membrane module can be adopted, but is not limited to this. A mesh spacer may be installed along the concentrated water flow path. A permeated water flow path material may be installed along the permeated water flow path. The reverse osmosis membrane is a membrane that allows water to pass through but does not allow impurities other than water, such as ions and salts, to pass through. When filtered water is supplied from the upstream end of the concentrated water flow path and flows along the concentrated water flow path, the water passes through the reverse osmosis membrane from the concentrated water flow path and moves to the permeated water flow path as permeated water, and impurities other than water, such as ions and salts, do not pass through the reverse osmosis membrane and remain in the concentrated water flow path. The permeated water is then collected, for example, in a permeated water collection pipe, which is the permeated water flow path, and is discharged from the downstream end of the permeated water collection pipe. The permeated water can be used for facility water, agricultural water, industrial water, or urban water. The facility water is water used in facilities such as outdoor air treatment air conditioners, scrubbers, cooling towers, and boilers. On the other hand, the concentrated water (remaining water) is discharged from the downstream end of the concentrated water flow path and may be used as cleaning water within the facility, may be discharged into a sewerage system, or may be used as dilution water in a sludge dilution treatment device. When the concentrated water is used as dilution water, the downstream end of the concentrated water flow path can be connected so as to communicate with a dilution treatment tank or a sludge transport flow path.

[0034] The sludge dilution treatment device is configured to dilute sludge to obtain diluted sludge. The sludge dilution treatment device has, for example, a dilution treatment tank 12, an inlet for receiving dilution organic matter-containing water, concentrated water, or sludge into the sludge dilution treatment device, and an outlet for discharging the diluted sludge from the sludge dilution treatment device. The sludge dilution treatment device may have a configuration capable of stirring the liquid in the dilution treatment tank 12 or the sludge transport flow path 13 so that the sludge and the dilution organic matter-containing water and / or concentrated water are mixed uniformly. The order in which the dilution organic matter-containing water and / or concentrated water are mixed with the sludge is not particularly limited. The place where they are mixed may be in the dilution treatment tank 12 as shown in FIG. 1, or may be in the sludge transport flow path 13 (the sludge buffer tank 6 which is a part of the sludge transport flow path 13) as shown in FIG. 2 or FIG. 3.

[0035] The flow rate regulator is configured to regulate the amount of liquid flowing in the sub-flow path 15. The sub-flow path is configured to allow liquid to flow from an organic matter-containing water source to a sludge dilution treatment device without passing through a biological treatment device, a coagulation treatment device, a wet filtration treatment device, or a reverse osmosis membrane treatment device. The liquid flowing in the sub-flow path 15 is organic matter-containing water (organic matter-containing water for dilution). The flow rate regulator regulates the amount of organic matter-containing water for dilution, thereby making it possible to obtain diluted sludge that meets the discharge water quality standards. The diluted sludge can then be discharged into a sewer, a river, the sea, a lake, a swamp, or a pond. The flow rate regulator may be manually controlled or automatically controlled.

[0036] The control device 5 is configured to be able to control the flow rate regulator (organic matter-containing water supply rate regulator valve V1) based on the amount of suspended solids measured by the SS measuring device. The SS measuring device is configured to be able to measure the amount of suspended solids. The amount of suspended solids may be measured by drying the water containing suspended solids and weighing the resulting dried residue, but it is preferable to measure the turbidity of the water containing suspended solids and use a calibration curve showing the relationship between turbidity and the amount of suspended solids. The measurement target of the SS measuring device can be concentrated water, diluted sludge, or organic matter-containing water, and is preferably diluted sludge. The amount of suspended solids in the diluted sludge can be measured by installing the SS measuring device in the dilution treatment tank, more specifically, in the piping (discharge water channel) connected to the outlet of the dilution treatment tank. Note that the SS measurement may be performed in a catchment basin, a water collection channel, or the like, instead of the dilution treatment tank.

[0037] The treatment device of the present invention may further include a concentrated water amount measuring device configured to measure the amount of concentrated water discharged, a sludge amount measuring device configured to measure the amount of sludge discharged, etc. By knowing the amount of concentrated water discharged, the supply amount of dilution organic matter-containing water can be set or adjusted more accurately. Also, by knowing the amount of sludge discharged, the supply amount of dilution organic matter-containing water can be set or adjusted more accurately.

[0038] In the present invention, in accordance with needs related to the treatment of organic matter-containing water, each device constituting the treatment device of the present invention can be replaced with an equivalent or similar device, equipment, etc., or other devices and equipment (for example, equipment from power generation to distribution (transmission) to ensure a stable supply of electricity, electrical equipment and electrical structures such as devices that use electricity, communication equipment such as telephone and information communication, firefighting equipment, crime prevention equipment, security equipment, piping equipment, etc.) can be added to the treatment device of the present invention. [Explanation of symbols]

[0039] 1: Biological treatment equipment 2: Coagulation treatment equipment 3: Wet filtration treatment equipment 4. Reverse osmosis membrane treatment equipment 5: Control Unit 6: Sludge buffer tank 7: Coagulant or flocculant 8: Water containing organic matter 9: Permeate water 10: Diluted sludge 11: Concentrated water transport channel 12: Dilution treatment tank 13: Sludge transport channel 14: Coagulated water transport channel V1: Dilution organic matter-containing water supply control valve V2: Sludge supply control valve SS: SS measuring device (turbidity meter) 15: Sub-channel 16: Biologically treated water transport channel 17: Filtration treatment water transport channel 18: Pathway for transporting organic matter-containing water

Claims

1. A part of the organic matter-containing water is subjected to biological treatment to obtain biologically treated water; The biologically treated water is subjected to a coagulation treatment and a solid matter removal treatment to obtain coagulated treated water and sludge; The coagulation treated water is subjected to wet filtration to obtain filtered water; The filtered water is subjected to a reverse osmosis membrane treatment to obtain a concentrated water and a permeate water. diluting the sludge with all of the organic matter-containing water to obtain diluted sludge; Including, Method for treating water containing organic matter.

2. 2. The method for treating organic matter-containing water according to claim 1, further comprising diluting the sludge with concentrated water.

3. Measure the amount of suspended solids in the diluted sludge, 2. The method for treating organic matter-containing water according to claim 1, further comprising adjusting a dilution ratio of the sludge based on the measured amount of suspended solids.

4. 2. The method for treating organic matter-containing water according to claim 1, further comprising discharging the diluted sludge into a sewer, a river, an ocean, a lake, a swamp or a pond.

5. 2. The method for treating organic matter-containing water according to claim 1, further comprising utilizing the permeate for facility water, agricultural water, industrial water or municipal water use.

6. A biological treatment device configured to perform biological treatment; A flocculation treatment device configured to perform flocculation treatment and solid matter removal treatment; A wet filtration treatment device configured to perform wet filtration treatment; a reverse osmosis membrane treatment device configured to perform reverse osmosis membrane treatment; a sludge dilution treatment device configured to dilute sludge to obtain diluted sludge; a main flow path configured to allow liquid to flow sequentially from an organic matter-containing water source to a biological treatment device, from the biological treatment device to a coagulation treatment device, from the coagulation treatment device to a wet filtration treatment device, and from the wet filtration treatment device to a reverse osmosis membrane treatment device; A sludge transport flow path configured to allow sludge to flow from the coagulation treatment device to the sludge dilution treatment device; and A sub-flow passage configured to allow liquid to flow from an organic matter-containing water source to a sludge dilution treatment device without passing through a biological treatment device, a coagulation treatment device, a wet filtration treatment device, and a reverse osmosis membrane treatment device. Including, Organic matter-containing water treatment equipment.

7. The sludge dilution treatment device has a dilution treatment tank, 7. The apparatus for treating organic matter-containing water according to claim 6, wherein a downstream end of the sub-channel is connected so as to communicate with the dilution treatment tank or the sludge transport channel.

8. A SS measurement device configured to measure the amount of suspended solids; a flow rate adjusting device configured to adjust the amount of liquid flowing through the secondary flow path; a control device configured to control the flow rate control device based on the amount of suspended solids measured by the SS measuring device; The organic matter-containing water treatment device according to claim 6, further comprising:

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