WO2006109715A1 - 有機性廃水の生物処理方法及び生物処理装置 - Google Patents
有機性廃水の生物処理方法及び生物処理装置 Download PDFInfo
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- WO2006109715A1 WO2006109715A1 PCT/JP2006/307440 JP2006307440W WO2006109715A1 WO 2006109715 A1 WO2006109715 A1 WO 2006109715A1 JP 2006307440 W JP2006307440 W JP 2006307440W WO 2006109715 A1 WO2006109715 A1 WO 2006109715A1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/121—Multistep treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- the present invention relates to a biological treatment method and apparatus for treating organic wastewater by an activated sludge method or the like, and in particular, organic wastewater capable of reducing excess sludge generated by biological treatment of organic wastewater.
- the present invention relates to a biological treatment method and apparatus.
- the activated sludge method has the advantages of being able to obtain treated water of good quality and being easy to maintain. It is widely used as a method for treating various organic wastewater such as wastewater.
- the volumetric load of BOD (organic matter expressed in terms of biochemical oxygen consumption) to the activated sludge tank that performs activated sludge treatment is as low as about 0.5 to 0.8 kgZm 3 Z days. For this reason, it is necessary to enlarge the activated sludge tank in order to cope with high loads, and there is a problem that a large installation area is required.
- a fluidized bed system in which a carrier is added to an activated sludge tank is known!
- the bacteria are retained on the carrier, so that the concentration of bacteria in the activated sludge tank can be increased and the BOD volumetric load can be increased to 3 kgZm 3 Z days.
- more surplus sludge is generated than in the normal activated sludge method, and more specifically, about 30% of the biodegraded BOD is generated.
- a high BOD load is applied to the first stage treatment tank. Suppress the growth of protozoa to prevent bacterial aggregation, and introduce activated sludge treated water containing dispersible bacteria and flowing out of the first-stage treatment tank into the second-stage treatment tank.
- the second-stage treatment tank holds protozoa that prey on dispersible bacteria, so that the dispersal bacteria are preyed on by the protozoa, thereby reducing excess sludge and agglomeration of biological communities. Progresses. For this reason, microbial aggregates (sludge) with good sedimentation are formed in the second stage treatment tank, and clear treated water can be obtained by solid-liquid separation of the effluent from the second stage treatment tank.
- Patent Document 2 discloses a biological treatment apparatus in which a feed refinement tank is provided between an activated sludge tank and a microbiological holding tank.
- phagocytosis by protozoa is carried out by dispersing flocculated bacteria and maintaining them in the micro-organism holding tank in the subsequent stage by performing ultrasonic treatment or the like in the feed refinement tank. Promote.
- Patent Document 1 Japanese Patent Laid-Open No. 55-20649
- Patent Document 2 Japanese Patent Laid-Open No. 57-74082
- the present invention has been made in view of the above problems, and organic waste water that can stably hold a certain amount of micro organisms in a micro organism holding tank and can stably reduce the amount of excess sludge generated. It is an object to provide a biological treatment method and apparatus. Means for solving the problem
- the present invention provides a micro-organism by supplying either or both of a bacterial substrate and a dispersible bacterium to a tank holding a micro-organism, and causing a predetermined amount of the dispersible bacterium to exist in the tank. Securing the food for the organisms to proliferate the micro-organisms, and use the micro-organisms that have proliferated to promote the reduction of excess sludge. More specifically, the present invention provides the following.
- a biological treatment method in which organic wastewater containing organic matter is introduced into a biological treatment tank for biological treatment, and the effluent from the biological treatment tank is solid-liquid separated into sludge and treated water, A biological treatment step for converting the organic wastewater into bacteria in the biological treatment tank using the organic matter as a substrate, and the generated sludge containing the bacteria is introduced into the sludge treatment tank to be eaten by micro-organisms to reduce sludge.
- a biological treatment method of organic wastewater comprising adding a substrate assimilated to bacteria and Z or dispersible bacteria produced using the organic matter as a substrate to the sludge treatment tank of the sludge reduction step .
- a first biological treatment is performed in which an organic wastewater containing an organic substance is introduced into a first biological treatment tank, and the organic substance is used as a substrate to generate dispersible bacteria.
- An effluent that flows out from the first biological treatment step containing the step and the dispersible bacteria is introduced into a second biological treatment tank to feed the dispersible bacteria into the micro organisms, and
- the sludge treatment tank contains a substrate and Z or first that are assimilated by dispersible bacteria. Add dispersible bacteria produced in a biological treatment tank Biological treatment method of organic wastewater according to (1).
- a part of the organic wastewater to be introduced into the biological treatment step and a substrate that is assimilated by Z or bacteria are introduced into a dispersive bacteria culture tank in parallel with the biological treatment tank, and dispersible bacteria are
- the sludge reduction step further includes a step of reducing the sludge by introducing a part or all of the generated sludge in the biological treatment step into the sludge treatment tank to prey on the micro organisms.
- An organic wastewater containing organic matter is introduced to produce bacteria using the organic matter as a substrate, a biological treatment tank for performing biological treatment, and a treatment liquid flowing out from the biological treatment tank is subjected to solid-liquid separation and treated water And a solid-liquid separation means for obtaining sludge, and a sludge treatment tank for holding micro organisms and introducing the sludge to prey on the micro organisms, and the substrate utilized by bacteria in the sludge treatment tank And a biological treatment apparatus for organic wastewater provided with an adding means for adding dispersible bacteria produced using Z or the organic substance as a substrate.
- the biological treatment tank is anaerobic biological treatment that biologically decomposes organic matter under anaerobic conditions, and an anaerobic biological treatment tank that biologically decomposes organic matter. It may be a tank. However, since anaerobic bacteria that decompose organic matter anaerobically have a slow growth rate, it is preferable to use an aerobic biological treatment tank to obtain a high reaction rate.
- a biological treatment system in the biological treatment process an arbitrary system such as a floating system or a fluidized bed system can be adopted.
- the floating type include an activated sludge method in which a sedimentation basin is provided after the biological treatment tank, and a membrane type activated sludge method in which the suspended sludge is filtered through a membrane and solid-liquid separated.
- the activated sludge method in which a sedimentation basin is provided after the biological treatment tank also includes a treatment method in which the sludge separated in the solid-liquid separation in the sedimentation basin is returned to the biological treatment tank as return sludge.
- various fluid fillers can be filled as a carrier for holding bacteria.
- the material of the carrier there are no limitations on the material of the carrier, and there are inorganic substances such as ash, sand, activated carbon, and ceramic, synthetic resins, and organic substances such as cellulose (including cellulose derivatives).
- Synthetic resins include polyurethane, polyethylene, polypropylene, polystyrene, and polybutyl alcohol.
- a foaming agent is suitable for these synthetic resins.
- a foam that is appropriately mixed and foamed is porous with a network structure and can be suitably used.
- carrier which uses a gel-like substance as a raw material.
- the shape of the carrier is not limited, and examples thereof include granular, cylindrical, honeycomb, thread-like, corrugated, etc. Examples of granular carrier shapes include spheres, pellets, and rectangles.
- a carrier having a size of about 0.1 to about LOm m can be suitably used.
- the filling rate of the carrier is preferably about 1 to 20% in bulk volume per biological treatment tank.
- HRT hydroaulic residence time
- L volume of the biological treatment tank
- the amount of sludge in the tank is the existing amount of microorganisms (sludge) in the biological treatment tank, and is obtained from Equation 2.
- the amount of extracted sludge is the amount of microorganisms (sludge) discharged from the biological treatment tank.
- the effluent flowing out from the biological treatment process contains bacteria grown using organic substances contained in the organic wastewater as a substrate.
- the effluent is treated in a solid-liquid separation process, etc., and the produced sludge is gathered and bacteria is flocked.
- this generated sludge is supplied to the sludge treatment tank, and the substrate and Z or organic matter that are utilized by bacteria are utilized and produced. Add a certain amount of dispersible bacteria so that microbes can easily prey on them. As a result, food necessary for growing a predetermined amount of micro-organisms is secured, so that it is possible to prevent the micro-organisms in the sludge treatment tank from decreasing, and a stable sludge reduction effect can be obtained.
- a predetermined amount of dispersible bacteria may be grown in the sludge treatment tank by adding a substrate that is assimilated to the bacteria to the sludge treatment tank.
- a substrate organic substances contained in organic wastewater that is the liquid to be treated in the biological treatment process, organic substances remaining in the effluent flowing out of the biological treatment process, etc. can be used, and other additives can be used. May be used.
- both the substrate and dispersible sludge may be added to the sludge treatment tank.
- the amount of the substrate and Z or dispersible bacteria added is preferably an amount necessary to produce dispersible bacteria sufficient to grow a predetermined amount of micro-organisms in the sludge treatment tank. Yes. Specifically, it is recommended to add 0.1% or more, especially 5 to 20% by weight of the COD (organic matter expressed in terms of chemical oxygen consumption) of the sludge supplied to the sludge treatment tank.
- the term "generated sludge" introduced into the sludge treatment tank refers to sludge produced in the biological treatment tank in the biological treatment process provided in the preceding stage of the sludge treatment tank.
- the biological treatment process is divided into a first biological treatment process and a second biological treatment process, and dispersible bacteria are grown in the first biological treatment process.
- the biological treatment is performed, and then in the second biological treatment step, the dispersal bacteria are preyed by the micro-organisms. Thereby, sludge reduction is realized more efficiently.
- the generated sludge obtained in the second biological treatment step is drawn directly from the second biological treatment tank, or a solid-liquid separation means is provided downstream of the second biological treatment tank. By installing it, it is separated into solid and liquid and sent to the sludge treatment tank in the subsequent sludge reduction process.
- biological treatment is also performed in which the organic matter remaining in the effluent of the first biological treatment process power is decomposed by bacteria. Therefore, in the invention described in (2), is excess sludge stable? If the amount can be reduced sufficiently, a good quality of treated water can be obtained.
- the dispersible bacteria per se or a substrate for generating dispersible bacteria is added to the sludge treatment tank.
- sludge is added as in the invention described in (5).
- Substances that serve as nutrients for micro-organisms may be added to the treatment tank.
- lipids that are particularly preferred for substances containing lipids include phospholipids, free fatty acids, sterols, and the like.
- substances containing phospholipids such as lysophospholipids and lecithin can be suitably used.
- rice bran, beer pomace, oil pomace, sugar beet lees, shellfish flour, eggshell, vegetable extract, fish meat, various amino acids, various vitamins, and the like can be used as nutrients.
- the sludge residence time in the sludge treatment tank is relatively long in order to prevent the outflow of micro-organisms. Specifically, as in the invention described in (6), 2 to 30 days. It is preferable that
- a sedimentation tank can be provided at the subsequent stage of the sludge treatment tank to return the sludge.
- solid-liquid separation can be performed using a dehydrator or a membrane, and only the solid content can remain in the sludge reduction tank.
- the membrane for example, an immersion membrane can be provided in the sludge treatment tank.
- the present invention by adding a substrate that is assimilated to bacteria and Z or dispersible bacteria to a sludge treatment tank that holds microbes such as protozoa, the reduction of microbes is prevented. In addition, a high weight loss rate of excess sludge can be obtained and stable treatment can be performed.
- FIG. 1 is a schematic diagram of a biological treatment apparatus according to a first embodiment of the present invention.
- FIG. 2 is a schematic diagram of a biological treatment apparatus according to a second embodiment of the present invention.
- FIG. 3 is a schematic diagram of a biological treatment apparatus according to a third embodiment of the present invention.
- FIG. 4 is a schematic diagram of a biological treatment apparatus according to a fourth embodiment of the present invention.
- FIG. 1 is a schematic diagram of an organic wastewater biological treatment apparatus (hereinafter simply referred to as “treatment apparatus”) 11 according to a first embodiment of the present invention.
- the treatment apparatus 11 includes a first activated sludge tank 21 as a biological treatment tank, a second activated sludge tank 31, and a solid-liquid A sedimentation basin 41 as a separation means and a sludge treatment tank 51 are provided.
- the first activated sludge tank 21 and the second activated sludge tank 31 are the first connection pipe 35
- the second activated sludge tank 31 and the settling tank 41 are the second connection pipe 45
- 51 is sludge channel 66, which is connected in series with each other.
- a raw water channel 25 is connected to the entrance side of the first activated sludge tank 21, and a bypass channel 26 as an adding means branches from this raw water channel 25, and the end of the no-pass channel 26 is sludge treated. Connected to tank 51. In the middle of the sludge channel 66, the first sludge channel 67 and the return sludge channel 68 are connected, and the end of the return sludge channel 68 is connected to the second activated sludge tank 31.
- pipes for supplying organic waste water other than raw water may be connected to the sludge treatment tank 51 as an addition means!
- organic wastewater such as sewage and industrial wastewater is introduced into the first activated sludge tank 21 from the raw waterway 25 as treated water.
- the organic wastewater is mixed with the activated sludge retained in the first activated sludge tank 21 and the first biological treatment (activated sludge treatment) process is performed to biodegrade the organic matter contained in the organic wastewater. To do.
- the first activated sludge tank 21 preferably has a pH of 6 to 8, a BOD volumetric load of 1 kg / m 3 / day or more, an HRT of 4 hours or less, Oxygen-containing gas such as air is supplied from a gas supply means (not shown) such as an ejector, and high load operation is performed under aerobic conditions.
- the first biological treatment process most of organic substances (70% or more in this embodiment) contained in the organic wastewater introduced as the treated water are biodegraded.
- the first activated sludge tank 21 is small and operated at a high load, the bacteria that have grown by utilizing organic substances are contained in the effluent in a dispersed state without flocking, and the first activated sludge tank 21 Escape from 21.
- This effluent is introduced into the second activated sludge tank 31 through the first connection pipe 35 and the second biological treatment (activated sludge treatment) step is performed.
- the second activated sludge tank 31 also has a worm and a micro-organism, and preferably has a pH of 6 to 8 and a BOD sludge load of 0.1 kgZkg-SSZ or less from a gas supply means (not shown). Operate under aerobic conditions by supplying oxygen-containing gas.
- the second activated sludge tank 31 has an SRT of 40 days or less, preferably 30 days or less, in order to grow microbes with a slow growth rate. More preferably, it is operated at a low load so as to be within a certain range of about 10-30 days.
- the second activated sludge tank 31 it is preferable to circulate a part of the solids separated from the liquid in the subsequent settling basin 41 as return sludge.
- a separation membrane may be provided in the second activated sludge tank 31 to operate in a membrane separation system that holds the sludge in the tank.
- the second activated sludge tank 31 may be operated with micro-organisms and bacteria supported on a fixed bed or a fluidized bed that may be added with a carrier. It should be noted that the sludge in the tank of the second activated sludge tank 31 is preferably replaced once every 40 days, particularly 30 days, to remove excessively proliferated micro-organisms and their feces.
- Residual organic matter contained in the effluent from the first activated sludge tank 21 is biodegraded in the second activated sludge tank 31, and dispersible bacteria are reduced by predation and self-digestion by micro-organisms. Since the second activated sludge tank 31 contains micro-organisms with a long SRT, the bacteria in the second activated sludge tank 31 are flocked, and mixed sludge, which is a floc-generated sludge containing micro-organisms, is also present. Generated.
- the liquid containing the generated sludge flows out from the second activated sludge tank 31 and is introduced into the sedimentation basin 41 from the second connection pipe 45, and the produced sludge is separated from the treated water in the sedimentation basin 41. Is done.
- the treated water is taken out from the treated water channel 55 connected to the sedimentation basin 41 outlet side, and at least a part of the generated sludge is sent from the sludge channel 66 to the sludge treatment tank 51.
- treated water with good water quality can be obtained by biodegradation in the second activated sludge tank 31 as well.
- the generated sludge separated in both the second activated sludge tank 31 and the settling basin 41 is sludge treatment tank. 5 May be introduced in 1.
- a part of the sludge separated in the sedimentation basin 41 is circulated to the second activated sludge tank 31 as a return sludge through a return path 68 branched from the sludge path 66.
- Sludge can also be returned from the second activated sludge tank 31 or sedimentation site 41 to the first activated sludge tank 21 as returned sludge! /.
- micro-organisms are retained in the sludge treatment tank 51, and organic waste water is introduced from the bypass 26, so that organic substances contained in the organic waste water are added as a substrate.
- a sludge reduction process is carried out to reduce the generated sludge.
- Substrate supplement The amount is preferably 0.1% by weight or more, particularly 1 to 20% by weight of the COD amount of the produced sludge supplied to the sludge treatment tank 51.
- active activity the liquid flowing out from the first biological treatment process
- the activated sludge treated water contains not only organic substances as a substrate but also dispersible bacteria. Further, the dispersible bacteria grown by biological treatment may be added to the sludge treatment tank 51 as it is or after being concentrated.
- the sludge treatment tank 51 is operated under an aerobic condition by supplying an oxygen-containing gas from a gas supply means (not shown) at pH 4 to 8, SRT 12 hours or more, particularly 48 hours to 30 days. Sludge treatment tank 51 is particularly effective in reducing sludge when the pH in tank 51 is 6 or less.
- the SRT in sludge treatment tank 51 adjusts the return ratio of the generated sludge separated in sedimentation tank 41 (return amount to second active sludge tank 31: supply amount to sludge treatment tank 51). If the amount of sludge produced in the first activated sludge tank 21 is large when the treatment device 11 is started up, half of the produced sludge to the total amount of produced sludge is transferred to the sludge treatment tank 51. A part of the supplied sludge may be discharged from the first sludge passage 67 as excess sludge.
- the sludge flowing out from the sludge treatment tank 51 (hereinafter referred to as “reduced sludge”) is connected to the sludge treatment tank 51 which can be sent to the second activated sludge tank 31 as it is or after being separated into solid and liquid. It may be discharged from the second sludge channel 65.
- the reduced sludge may be returned to the sludge treatment tank 51.
- the sludge treatment tank 51 may also contain a nutrient that promotes the growth of micro-organisms.
- Substances containing lipids can be used as nutrients, and the amount added is preferably at least 0. Olmg / L / day per tank volume, especially 0.1 to LOmg / L days.
- the first activated sludge tank 21 two or more biological treatment tanks may be provided in series to perform multistage treatment. Further, the first activated sludge tank 21 may be a fluidized bed to which a carrier may be added or a good carrier may be added. As a result, high load processing with a BOD volumetric load of 5 kgZm 3 Z days or more is possible. [0051] In the second activated sludge tank 31, in order to make use of the action of micro-organisms with a slower growth rate than bacteria and the self-degradation of bacteria, operating conditions and treatment equipment that allow micro-organisms and bacteria to remain in the system are used. It is important to adopt it.
- the second activated sludge tank 31 is preferably used in an activated sludge treatment system that returns sludge or a membrane separation activated sludge treatment system!
- the amount of micro-organisms retained in the tank can be increased by adding a carrier to the aeration tank.
- the amount of micro-organisms retained in the tank can be increased by adding a carrier.
- the shape of the carrier added to the first activated sludge tank 21, the second activated sludge tank 31, and the sludge treatment tank 51 is arbitrary, such as a spherical shape, a pellet shape, a hollow cylindrical shape, a thread shape, and the size is also 0. 1 ⁇ : A diameter of about LOmm is acceptable.
- the material of the carrier is arbitrary such as a natural material, an inorganic material, or a polymer material, and a gel material may be used.
- FIG. 2 is a schematic diagram of the treatment device 12, and the treatment device 12 includes an activated sludge tank 22 as a biological treatment tank, a sedimentation basin 41, and a sludge treatment tank 51.
- the activated sludge tank 22 is connected to the sedimentation basin 41 via the first connection pipe 35. That is, the treatment apparatus 12 of the second embodiment does not include the first biological treatment tank 21 unlike the treatment apparatus 11 of the first embodiment, and the return path 68 of the treatment apparatus 12 of the second embodiment is an activated sludge tank. 22 and connected.
- the activated sludge tank 22 of the treatment apparatus 12 is larger than the activated sludge tank 21 of the treatment apparatus 11 of the first embodiment.
- the operating conditions are based on the standard activated sludge method, but can be appropriately adjusted depending on the method such as fluidized bed, multistage activated sludge, membrane activated sludge and the like.
- Bacteria are generated in the activated sludge tank 22, and the generated bacteria are flocked and enter the sedimentation basin 41 in a flocked state. In the sedimentation basin 41, flocs having a large specific gravity are separated from the liquid component by natural sedimentation, and the produced sludge is obtained, and the liquid component is taken out from the treatment channel 55 as treated water.
- FIG. 3 is a schematic diagram of the processing apparatus 13 according to the third embodiment of the present invention.
- the processing apparatus 13 includes a first activated sludge tank 21 and a second activated sludge tank 21 that are the same as the processing apparatus 11 of the first embodiment.
- the activated sludge tank 31, the sedimentation basin 41, and the sludge treatment tank 51 are provided, and have substantially the same configuration as the treatment apparatus 11.
- the bypass path 26 for bypassing the raw water in the treatment apparatus 11 of the first embodiment is not provided in the treatment apparatus 13, but instead a branch path 27 as an adding means is provided.
- One end of the branch path 27 is connected in the middle of the first connection pipe 35, the other end is connected to the sludge treatment tank 51, and sludge is formed using organic substances contained in the effluent flowing out of the first activated sludge tank 21 as a substrate. Supply to treatment tank 51.
- FIG. 4 is a schematic diagram of the treatment apparatus 14 according to the fourth embodiment of the present invention, in which an activated sludge tank 23 as a biological treatment tank, a dispersal bacteria culture tank 24, a sedimentation tank 41, And a sludge treatment tank 51.
- the activated sludge tank 23 is larger than the activated sludge tank 21 of the treatment apparatus 11 of the first embodiment.
- the standard activated sludge method can be applied.
- Bacteria grown in the activated sludge tank 23 enter the sedimentation basin 41 in a flocked state as in the second embodiment, and at least a part of the generated sludge separated in the solid-liquid separation in the sedimentation basin 41 is a sludge channel 66. Then, it is supplied to the sludge treatment tank 51, and the remaining part is returned to the activated sludge tank 23 via the return path 68.
- a second raw water channel 28 is connected instead of the bypass channel 26 of the treatment device 12 of the second embodiment, and the end of the second raw water channel 28 is the dispersal bacteria culture tank 24. It is connected to the entrance side.
- the dispersal cell culture tank 24 is smaller than the first activated sludge tank 21 of the treatment apparatus 11 of the first embodiment, preferably operated at pH 6-8, BOD volume load lkgZm 3 Z days or more, HRT2 4 hours or less. Produce dispersible bacteria.
- the dispersal bacteria culture tank 24 is connected to the sludge treatment tank 51 via the third connection pipe 29, and the dispersible bacteria produced in the dispersal bacteria culture tank 24 are treated with the sludge treatment via the third connection pipe 29.
- the third connecting pipe 29 functions as an adding means.
- Example 1 the treatment device 11 shown in Fig. 1 was used, and simulated wastewater (COD concentration 1,000 mgZL, BOD concentration 660 mgZL)
- the first activated sludge tank 21 has a capacity of 3.6 L, pH 6.8, BOD negative Load 3. 85kg / m day, HRT 4 hours, operation without return sludge.
- the second activated sludge tank 31 has a capacity of 15L, pH 6.8, BOD sludge load with respect to the sludge amount in the tank, 0.022kg / mM LSS / day, and HRT operated for 17 hours.
- almost all organic substances contained in the water to be treated are biodegraded in the first activated sludge tank 21 and the second activated sludge tank 31, and the first activated sludge tank 21 and the second activated sludge tank 21 are activated.
- the treatment conditions for the whole biological treatment tank including the sludge tank 31 were BOD load of 0.75 kg / m day and HRT of 21 hours.
- the sludge treatment tank 51 had a capacity of 3 L, and was operated at pH 5.0, HRT 6 days, and SRT 6 days.
- the sludge extracted from the second activated sludge tank 31 (COD concentration 7, OOOmg ZL) was introduced into the sludge treatment tank 51 at a supply amount of 0.5 LZ.
- the sludge in the sludge treatment tank 51 was extracted in 0.5 LZ days.
- treated water bypassed from the bypass 26 was added at a COD concentration of 10.5 mg / day as a substrate source to be utilized by bacteria.
- the sludge conversion rate of BOD contained in the treated water is. 12kg—MLSSZkg—BOD.
- Example 1 In addition to the configuration of Example 1 'conditions, lecithin was added to the sludge treatment tank 51 as a nutrient once a day so that the concentration in the sludge treatment tank 51 immediately after addition was lmgZL. As a result, the sludge conversion rate of BOD contained in the treated water was 0.08 kg—MLSSZkg—B OD. In addition, the concentration of micro organisms in the sludge treatment tank 51 was more stable than that in Example 1.
- Example 3 the treatment apparatus 14 shown in FIG. 4 was used, and the same simulated wastewater as in Example 1 was used as the treated water.
- the activated sludge tank 23 has a capacity of 15 L, pH 6.8, BOD load of 0.76 kg / m 3 / day and HRT for 20 hours.
- the sludge treatment tank 51 has a capacity of 3L and was operated at pH 5.0, HRT 6 days, SRT 6 days.
- the sludge extracted from the activated sludge tank 23 was introduced at a supply amount of 0.5 LZ days.
- the sludge in the sludge treatment tank 51 was drawn out in 0.5 LZ days.
- Concentrated sludge mainly composed of dispersal bacteria generated in the dispersal bacteria culture tank 24 was added to the sludge treatment tank 51 via the third connection pipe 29. That is, the dispersal bacteria obtained by adding the treated water bypassed from the bypass path 28 as a substrate to the dispersal cell culture tank 24 and producing sludge in the dispersal cell culture tank 24.
- Main concentrated sludge was added to sludge treatment tank 51 at 17.5 mg COD / day.
- lecithin was added to the sludge treatment tank 51 once a day as a nutrient so that the concentration in the sludge treatment tank 51 immediately after addition was lmgZL.
- Example 4 a treatment apparatus 12 shown in FIG. 2 was used, and an experiment was conducted using simulated waste water similar to Example 1 as treated water.
- the activated sludge tank 22 has a capacity of 15L, pH 6.8, BOD load 0.776kg / m day, and HRT 20 hours.
- the sludge treatment tank 51 has a capacity of 3 L, and was operated at pH 5.0, HR T6 days, and SRT 6 days.
- the sludge extracted from the activated sludge tank 22 was introduced at a supply amount of 0.5 LZ.
- the sludge in the sludge treatment tank 51 was drawn out in 0.5 LZ days.
- Example 4 as in Example 1, a part of the water to be treated was bypassed from the bypass path 26 and added as a substrate source. Furthermore, lecithin was added to the sludge treatment tank 51 as a nutrient once a day so that the concentration in the sludge treatment tank 51 immediately after addition was lmgZL. As a result, the conversion rate of BOD contained in the treated water was 0.25 kg / m-MLSS / kg BOD as BOD.
- Example 5 a treatment apparatus 13 shown in FIG. 3 was used, and an experiment was conducted using simulated wastewater similar to Example 1 as treated water.
- the capacities and operating conditions of the first activated sludge tank 21, the second activated sludge tank 31, and the sludge treatment tank 51 were the same as in Example 1.
- the substrate source added to the sludge treatment tank 51 in accordance with the treatment device 13 of FIG. 3 is the one obtained by concentrating the sludge in the tank of the first activated sludge tank 21 that is not treated water.
- the sludge conversion rate of BOD contained in the water to be treated was 0.10 kg / m—MLSS / kg—BOD as BOD.
- Example 6 in addition to the configuration of Example 5 'conditions, lecithin was added as a nutrient to sludge treatment tank 51 once a day so that the concentration in sludge treatment tank 51 immediately after addition was lmgZL. It was. In other cases, the treatment was continued under the same conditions as in Example 5. As a result, the sludge conversion rate of BOD contained in the treated water was 0.15 kg / m—MLSS / kg—BOD as BOD. In addition, the concentration of micro-organisms in the sludge treatment tank 51 was stable compared with Example 5.
- Example 1 As Comparative Example 1, the simulated wastewater used in Example 1 was introduced as treated water into a 15 L activated sludge tank and operated for 1 month at pH 6.8, BOD load of 0.76 kg / m day, and HRT of 20 hours. The quality of the treated water obtained by solid-liquid separation using the same sedimentation basin 41 as in Example 3 at the latter stage of the activated sludge tank was good. The sludge conversion rate of BOD contained in the treated water was 0 as BOD. 40kg / m—MLSS / kg—BOD.
- Example 1 the amount of excess sludge generated could be reduced to less than half that of Comparative Example 1 which is the standard activated sludge method. Moreover, in any of the examples, it was possible to prevent a decrease in micro organisms in the sludge treatment tank that performs sludge reduction, and a stable sludge reduction effect was obtained. Furthermore, in any of the examples, the quality of the treated water obtained from the sedimentation basin 41 was good, and high treatment efficiency was obtained.
- the present invention can be used for biological treatment of organic wastewater such as sewage.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Botany (AREA)
- Biotechnology (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2006234427A AU2006234427B2 (en) | 2005-04-12 | 2006-04-07 | Biological treatment method and device of organic wastewater |
CN2006800168839A CN101175700B (zh) | 2005-04-12 | 2006-04-07 | 有机废水的生物处理方法和生物处理装置 |
JP2007512968A JP5176542B2 (ja) | 2005-04-12 | 2006-04-07 | 有機性廃水の生物処理方法及び生物処理装置 |
US11/910,994 US7879237B2 (en) | 2005-04-12 | 2006-04-07 | Method for biological disposal of organic wastewater and biological disposal apparatus |
EP06731387A EP1878706A4 (en) | 2005-04-12 | 2006-04-07 | PROCESS FOR THE BIOLOGICAL REMOVAL OF ORGANIC WASTEWATER AND BIOLOGICAL DISPOSAL APPARATUS |
Applications Claiming Priority (2)
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JP2005-114326 | 2005-04-12 | ||
JP2005114326 | 2005-04-12 |
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WO2006109715A1 true WO2006109715A1 (ja) | 2006-10-19 |
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PCT/JP2006/307440 WO2006109715A1 (ja) | 2005-04-12 | 2006-04-07 | 有機性廃水の生物処理方法及び生物処理装置 |
Country Status (8)
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US (1) | US7879237B2 (ja) |
EP (1) | EP1878706A4 (ja) |
JP (1) | JP5176542B2 (ja) |
KR (1) | KR101274721B1 (ja) |
CN (1) | CN101175700B (ja) |
AU (1) | AU2006234427B2 (ja) |
TW (1) | TWI388513B (ja) |
WO (1) | WO2006109715A1 (ja) |
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JP2007326067A (ja) * | 2006-06-09 | 2007-12-20 | Kurita Water Ind Ltd | 廃水の生物処理促進剤およびそれを用いた廃水の生物処理方法 |
JP2008188503A (ja) * | 2007-02-01 | 2008-08-21 | Sumitomo Heavy Industries Environment Co Ltd | 排水処理装置及び排水処理方法 |
JP2008246420A (ja) * | 2007-03-30 | 2008-10-16 | Kurita Water Ind Ltd | 多段式生物処理装置および多段式生物処理方法 |
JP2011092811A (ja) * | 2009-10-27 | 2011-05-12 | Asahi Kasei Engineering Kk | 排水処理装置及び排水処理方法 |
WO2012073752A1 (ja) * | 2010-11-30 | 2012-06-07 | 栗田工業株式会社 | 有機性排水の生物処理方法及び装置 |
JP2015512335A (ja) * | 2012-04-03 | 2015-04-27 | ハスケーニッヒディーエイチブイ・ネーデルランド・ビー.ブイ. | ハイブリッド汚水処理 |
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SG193336A1 (en) * | 2011-03-16 | 2013-10-30 | Kurita Water Ind Ltd | Device and method for biological treatment of organic wastewater |
WO2013103124A1 (ja) * | 2012-01-06 | 2013-07-11 | 栗田工業株式会社 | 有機性排水の生物処理方法及び装置 |
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- 2006-04-07 JP JP2007512968A patent/JP5176542B2/ja not_active Expired - Fee Related
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JP2015512335A (ja) * | 2012-04-03 | 2015-04-27 | ハスケーニッヒディーエイチブイ・ネーデルランド・ビー.ブイ. | ハイブリッド汚水処理 |
Also Published As
Publication number | Publication date |
---|---|
EP1878706A1 (en) | 2008-01-16 |
CN101175700A (zh) | 2008-05-07 |
EP1878706A4 (en) | 2013-03-27 |
US20090277832A1 (en) | 2009-11-12 |
KR101274721B1 (ko) | 2013-06-14 |
US7879237B2 (en) | 2011-02-01 |
KR20070119090A (ko) | 2007-12-18 |
CN101175700B (zh) | 2011-04-27 |
AU2006234427B2 (en) | 2011-05-12 |
JP5176542B2 (ja) | 2013-04-03 |
AU2006234427A1 (en) | 2006-10-19 |
TW200635865A (en) | 2006-10-16 |
JPWO2006109715A1 (ja) | 2008-11-13 |
TWI388513B (zh) | 2013-03-11 |
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