CN103228578A - Method and apparatus for biologically treating organic wastewater - Google Patents
Method and apparatus for biologically treating organic wastewater Download PDFInfo
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- CN103228578A CN103228578A CN2011800576561A CN201180057656A CN103228578A CN 103228578 A CN103228578 A CN 103228578A CN 2011800576561 A CN2011800576561 A CN 2011800576561A CN 201180057656 A CN201180057656 A CN 201180057656A CN 103228578 A CN103228578 A CN 103228578A
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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
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological 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
- 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
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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
- Y02W10/20—Sludge processing
Abstract
A sludge reduction tank in which excess sludge from a biological treatment tank is captured and fed upon by microorganisms, wherein the proliferation of microorganisms effective at reducing sludge is promoted and sludge reduction effects are increased. This method for biologically treating organic wastewater comprises the steps of feeding organic wastewater to a biological treatment tank (1) to perform activated sludge treatment, separating the solids and liquids in the biologically treated water, recycling part of the separated sludge to the biological treatment tank (1), removing part of the sludge and/or separated sludge in the biological treatment tank (1), conducting the removed sludge to a sludge reduction tank (3), and subjecting the sludge to biological oxidation treatment under aerobic conditions to reduce the sludge; wherein part of the organic wastewater is conducted to the sludge reduction tank (3).
Description
Technical field
The present invention relates to a kind of bioremediation and device that utilizes the organic drainage in the concentration range that comprises living drainage, water drain water, food factories or the pulp factories processing of organic drainage widely, especially relate to a kind ofly on the basis of keeping high water quality treatment, processing efficiency, can lower the bioremediation and the device of the organic drainage of excess sludge generating capacity.
Background technology
Employed activated sludge process during the biological treatment organic drainage has advantages such as good, the easy maintenance of water quality treatment, therefore, uses widely in water drain water treatment or industrial wastewater processing etc.But, because the BOD volumetric loading of activated sludge process is 0.5～0.8kg/m
3/ d degree needs vast land area.20% of the BOD that decomposes converts thalline to, also promptly converts mud to, so the processing of a large amount of excess sludges also becomes problem.
High loading about organic drainage is handled, the known fluidized bed method that the interpolation carrier is arranged.When using this method, can be at 3kg/m
3The BOD volumetric loading running that/d is above.But in this method, shortcoming is that it is 30% degree of the BOD of decomposition that sludge quantity takes place, than common activated sludge process height.
Put down in writing a kind of method in the Japanese kokai publication sho 55-20649 communique, it is at first handled at first treatment trough organic drainage by bacterium, the contained oxidation operation of draining is decomposed, after converting the thalline of non-coherency bacterium to, at second treatment trough, the predation of anchorage protozoon is removed, can make excess sludge reduction.Further, in this method, but high loaded process, the processing efficiency of activated sludge process also improves.
Propose a large amount of so utilizing and be positioned at the protozoon of bacterium high-order or the method for wastewater treatment of metazoal predation.
For example, in TOHKEMY 2000-210692 communique, a kind of countermeasure that causes handling property to worsen at the water quality change because of former water that becomes the problem reason in the treatment process of Japanese kokai publication sho 55-20649 communique has been proposed.As concrete method, proposed " BOD that adjusts processed water change from average concentration median 50% in ", " through the time ground measure in first treatment trough and the water quality of first treating water ", the method for " during the water quality deterioration of first treating water, adding kind of mud or microbial preparation " etc. at first treatment trough.
Put down in writing a kind of method in the Japanese Patent Publication 60-23832 communique, it is with the primary sludge or the excess sludge of bacterium, yeast, actinomycetes, algae, mould fungi or wastewater treatment, when making protozoon or metazoan (metazoan) predation, by ultrasonic treatment or mechanical stirring, make the clustering size (flock size) of these baits littler than the face of animal.
As the method for the multiple-stage treatment that relates to thermopnore and activated sludge process, the method for putting down in writing is arranged in Japan speciallys permit No. 3410699 communique.In this method, the activated sludge process with the back level turns round under the underload of BOD sludge loading 0.1kg-BOD/kg-MLSS/d, makes mud oneself oxidation, can significantly lower mud taking-up amount.
So utilize the multistage activated sludge process of the predation of animalcule, in fact be used in organic wastewater and handle, can promote processing efficiency according to the object draining, make the sludge quantity decrement takes place.But, the mud decrement effect, and different, still, the decrement effect is the degree that reduces by half with conventional actived sludge generation sludge quantity according to treatment condition or draining water quality, and, keep stable mud decrement between can not be for a long time.
For improving the mud decrement effect, trial will import other biological treatment trough (mud decrement groove) from the excess sludge of biological treatment trough taking-up, prey on the method for decrement mud by making animalcule in this groove.
In TOHKEMY 2006-51414 communique, a kind of bioremediation has been proposed, it imports organic drainage at first biological treating tank, carry out a biological disposal upon by bacterium, import the treatment solution that contains from the bacterium of this first biological treating tank at second biological treating tank, carry out active sludge treatment, with mud in mud in this first biological treating tank and/or this second biological treating tank, carry out solid-liquid separation, the mud of gained is imported the 3rd biological treating tank at the mud decrement groove, carry out oxide treatment under aerobic condition, the handled thing with part or all of the 3rd biological treating tank is recycled to this second biological treating tank.
In this method,, can not cause dysgenic advantage to each processing so have because the biological treatment system that the biological treatment system that usefulness is handled in draining and mud decrement are used separates, still have can not stably maintaining sludge decrement groove in the problem of animalcule number.This be because, the excess sludge that imports the mud decrement groove is made of the bacterium that carries out self-digestion, even with its predation, animalcule still is difficult to breed.
The prior art document
Patent documentation
Patent documentation 1: Japanese kokai publication sho 55-20649 communique
Patent documentation 2: TOHKEMY 2000-210692 communique
Patent documentation 3: Japanese Patent Publication 60-23832 communique
Patent documentation 4: No. 3410699 communique of Japan's special permission
Patent documentation 5: TOHKEMY 2006-51414 communique
Summary of the invention
The problem that invention will solve
Problem of the present invention is, a kind of bioremediation and device of organic drainage are provided, it solves aforementioned problem in the past, at the excess sludge of accepting from biological treating tank, make in the mud decrement groove of animalcule predation, promotion improves the sludge reduction effect to the effective animalcule propagation of mud decrement.
Solve the method for problem
The inventor is for solving aforementioned problems, the result who makes great efforts to study, discovery is at the excess sludge of accepting from biological treating tank, make in the mud decrement groove of animalcule predation, by the organic drainage of dispensing as former water, can in the mud decrement groove, stably keep animalcule, reach the significantly minimizing of mud.
The present invention is based on discovery like this and finishes, and following content is its main idea.
[1] a kind of bioremediation of organic drainage, it imports biological treating tank with organic drainage and carries out active sludge treatment, and biological treatment of water carried out solid-liquid separation, the part of solid-liquid separation mud is recycled to this biological treating tank, and take out the part of interior mud of this biological treating tank and/or solid-liquid separation mud and the mud that takes out is imported the mud decrement groove and under aerobic condition, handle the decrement of carrying out mud by bio-oxidation, it is characterized in that, the part of aforementioned organic drainage is imported this mud decrement groove.
[2] as the bioremediation of [1] described organic drainage, wherein, it is so that the SRT of aforementioned biological treating tank becomes the part that 15～30 days mode is taken out mud in the aforementioned biological treating tank and/or solid-liquid separation mud, handles with the condition that the SRT of aforementioned mud decrement groove became more than 5 days
[3] a kind of bioremediation of organic drainage, its with organic drainage water flowing in regular turn to the multistage biological treating tank that is provided with more than the secondary, with the disposable water flowing of organic drainage to first biological treating tank that is provided with in the multistage biological treating tank, carry out a biological disposal upon by bacterium, to carry out active sludge treatment at second biological treating tank from first biological treatment of water that contains bacterium of first biological treating tank, and the biological treatment of water of the biological treating tank of final level carried out solid-liquid separation, the part of solid-liquid separation mud is recycled to the later biological treating tank of this second biological treating tank, and, the part of mud and/or solid-liquid separation mud imports the mud decrement groove and handle the decrement of carrying out mud by bio-oxidation under aerobic condition in the biological treating tank that this second biological treating tank is later, it is characterized in that
The part of the aforementioned organic drainage and/or first biological treatment of water is imported this mud decrement groove.
[4] as the bioremediation of [3] described organic drainage, wherein, it is so that the SRT of the later biological treating tank of aforementioned second biological treating tank becomes the part that 15～30 days mode is taken out mud in the later biological treating tank of aforementioned second biological treating tank and/or solid-liquid separation mud, handles with the condition that the SRT of aforementioned mud decrement groove became more than 5 days.
[5] as the bioremediation of each described organic drainage in [1] to [4], wherein, it is so that the organic matter sludges load of aforementioned mud decrement groove becomes 0.15g-COD
CrThe following mode of/g-VSS/d imports this mud decrement groove with the aforementioned organic drainage and/or first biological treatment of water.
[6] as the bioremediation of each described organic drainage in [1] to [5], wherein, it intermittently carries out mud in the biological treating tank and/or solid-liquid separation mud are imported aforementioned mud decrement groove, and stop to import mud during in, liquid in this mud decrement groove left standstill carry out precipitate and separate, and will be recycled to aforementioned biological treating tank by the part of the resulting supernatant water of this precipitate and separate or outside system, discharge, will be recycled to aforementioned biological treating tank by the part of the resulting precipitating sludge of this precipitate and separate or outside system, discharge as treating water
[7] a kind of biological treatment device of organic drainage, it possesses: accept organic drainage to carry out the biological treating tank of active sludge treatment, to carry out the equipment for separating liquid from solid of solid-liquid separation from the biological treatment of water of this biological treating tank, will with this equipment for separating liquid from solid the part of isolating solid-liquid separation mud be recycled to the mud send-back device of this biological treating tank, take out the mud withdrawing device of the part of interior mud of this biological treating tank and/or solid-liquid separation mud, and accept the mud that takes out and under aerobic condition, handle the mud decrement groove that carries out mud decrement by bio-oxidation, it is characterized in that
It has the device that the part of aforementioned organic drainage is imported this mud decrement groove.
[8] as the biological treatment device of [7] described organic drainage, wherein, it is so that the SRT of aforementioned biological treating tank becomes the part that 15～30 days mode is taken out mud in the aforementioned biological treating tank and/or solid-liquid separation mud by aforementioned mud withdrawing device, so that the condition that the SRT of aforementioned mud decrement groove became more than 5 days is handled.
[9] a kind of biological treatment device of organic drainage, it possesses: biological treating tank, this biological treating tank be organic drainage water flowing in regular turn be provided with the above multistage biological treating tank of secondary, first biological treating tank in being provided with multistage biological treating tank is the groove that organic drainage is carried out a biological disposal upon by bacterium with disposable water flowing, and second biological treating tank is to have to carry out the groove of active sludge treatment from first biological treatment of water that contains bacterium of first biological treating tank; The biological treatment of water of final grade biological treating tank is carried out the equipment for separating liquid from solid of solid-liquid separation; Will with this equipment for separating liquid from solid the part of isolating solid-liquid separation mud be recycled to the mud send-back device of the later biological treating tank of this second biological treating tank; Take out the mud withdrawing device of the part of interior mud of the later biological treating tank of this second biological treating tank and/or solid-liquid separation mud; And the mud that accept to take out handles the mud decrement groove of the decrement of carrying out mud by bio-oxidation under aerobic condition, it is characterized in that,
It has the device that the part of the aforementioned organic drainage and/or first biological treatment of water is imported this mud decrement groove.
[10] as the biological treatment device of [9] described organic drainage, wherein, it is so that the SRT of the later biological treating tank of aforementioned second biological treating tank becomes the part that 15～30 days mode is taken out mud in the later biological treating tank of aforementioned second biological treating tank and/or solid-liquid separation mud by aforementioned mud withdrawing device, handles with the condition that the SRT of aforementioned mud decrement groove became more than 5 days.
[11] as the biological treatment device of each described organic drainage in [7] to [10], wherein, it is so that the organic matter sludges load of aforementioned mud decrement groove is 0.15g-COD
CrThe following mode of/g-VSS/d imports this mud decrement groove with the aforementioned organic drainage and/or first biological treatment of water.
[12] as the biological treatment device of each described organic drainage in [7] to [11], wherein, it intermittently carries out mud in the biological treating tank and/or solid-liquid separation mud are imported aforementioned mud decrement groove, and stop to import mud during in, liquid in this mud decrement groove left standstill carry out precipitate and separate, and have: the part of supernatant water that will be by this precipitate and separate gained is recycled to the device of aforementioned biological treating tank and/or the device that the part of this supernatant water is discharged outside system as treating water, and the part of precipitating sludge that will be by this precipitate and separate gained is recycled to the device of aforementioned biological treating tank and/or the device that the part of this precipitating sludge is discharged outside system.
The effect of invention
According to the present invention, at the excess sludge of accepting from biological treating tank, make in the mud decrement groove of animalcule predation, by the organic drainage of the former water of dispensing, can supply with becomes the matrix that animalcule propagation goes up effective bait, and animalcule is bred at the mud decrement groove, can stably keep its quantity, reach the significantly minimizing of mud,, can carry out a biological disposal upon efficiently organic drainage based on excellent effect as described later.
The significantly minimizing of the mud that takes place when 1) draining is handled
2), promote processing efficiency by high loaded process
3) keep stable treated water
Description of drawings
Fig. 1 is the system diagram of the embodiment of expression bioremediation of organic drainage of the present invention and device.
Fig. 2 is the system diagram of other embodiments of expression bioremediation of organic drainage of the present invention and device.
Embodiment
Below be with reference to the accompanying drawings, explain the bioremediation of organic drainage of the present invention and the embodiment of device.
Fig. 1, the 2nd, the system diagram of the bioremediation of expression organic drainage of the present invention and the embodiment of device.
In Fig. 1,2,1 is biological treating tank, and 1A is first biological treating tank, and 1B is second biological treating tank, and 2 is settling bath, and 3 is the mud decrement groove, reaches the parts of identical function, indicates same-sign.
[first mode]
Fig. 1 is expression first mode of the present invention, a part that imports organic drainage (former water) is at mud decrement groove 3, import remainder at biological treating tank 1, carry out active sludge treatment, the biological treatment of water that imports this biological treating tank 1 is at settling bath 2, carry out solid-liquid separation, divide and dried uply discharge outside system as treating water.The part separated sludge is as loopback mud, and loopback is at biological treating tank 1, and remainder imports at mud decrement groove 3 as taking out mud, in mud decrement groove 3, handles by bio-oxidation at aerobic condition, carries out mud decrement.
Biological treating tank 1 is pH5.5～8, is preferably pH6.5～7.5 especially, and dissolved oxygen (DO) concentration is preferably more than the 0.5mg/L.
Though biological treating tank 1 can adopt in the past standard activity sludge treatment method or the active sludge treatment groove of these various political reforms, handle for carrying out high loading, preferred biological treating tank 1 is the thermopnore formula of filling carrier.
The support shapes that is added on biological treating tank 1 is spherical arbitrarily, ingot shape (Pellet), hollow tube-shape, thread etc., and size also is advisable with the diameter of 0.1～10mm degree.The material of carrier is natural materials, inorganic materials, macromolecular material etc. arbitrarily, also can use gelatinoid.
Be added on the filling ratio of the carrier of biological treating tank 1, aspect mobile, consider, preferred below 50%.
In the mode of Fig. 1, replacement is recycled to the separated sludge of settling bath 2 activated sludge process of biological treating tank 1, also can adopt in biological treating tank 1, the membrane sepn of impregnated membranes module mud method alive, in the case, also the biological treatment of water of biological treating tank 1 is carried out solid-liquid separation, the loopback separated sludge is to biological treating tank 1.
In the mode of Fig. 1, at mud decrement groove 3, replace the solid-liquid separation mud of settling bath 2, also can import the mud of directly taking from biological treating tank 1, also can import the solid-liquid separation mud of settling bath 2 and take from biological treating tank 1 mud the two.
[second mode]
Fig. 2 is expression second mode of the present invention, imports a part of organic drainage (former water) to mud decrement groove 3, imports remainder at the first biological treating tank 1A, by dispersed bacterium, more than 70% of oxygenolysis organic composition, preferred more than 80%, so that preferred more than 90%.This first biological treating tank 1A is more than the pH6, and is preferred below 8.But oily sub also can be more than the pH8 for a long time in the former water.
The COD of the first biological treating tank 1A
CrVolumetric loading is 1kg-COD
Cr/ m
3More than/the d, 1～20kg-COD for example
Cr/ m
3/ d, HRT are below the 24h, when for example being 0.5～24h, can obtain the dominant treating water of non-coherent dispersed bacterium, in addition, shorten HRT, but high loading are handled the low draining of organic concentration, and be therefore preferred.
The DO concentration of this first biological treating tank 1A is to be controlled at below the 0.5mg/L, especially preferably is controlled at 0.05～0.5mg/L, and thus, the dispersion bacterium of 1～5 μ m degree size is preponderated, and these are at second biological treating tank 1B prey promptly.
In this first biological treating tank 1A, but also the loopback part is from the mud of back level biological treating tank, and first biological treating tank can be the above multistage formation of two grooves.
The HRT of the first biological treating tank 1A is than when long, and thread property bacterium is preponderated or forms clustering, with the generation difficult bacterium that is preyed on by the second biological treating tank 1B of back grade that becomes.Therefore, preferably control the HRT of the first biological treating tank 1A for certain.This suitableeest HRT is according to the water quality of former water and different, and therefore, preferably the HRT that can remove 70～90% organic compositions is obtained in chamber test (lab test) etc. by experiment.As keep HRT just when method, when having the former water yield to reduce, loopback partially disposed water makes the water yield that flows into the first biological treating tank 1A certain, make the stable method of the HRT of the first biological treating tank 1A or cooperate former water yield change, make the method for the fluctuation of water table of the first biological treating tank 1A.The stable amplitude of HRT of the first biological treating tank 1A preferably is included in 0.75～1.5 times the scope of the suitableeest HRT that laboratory test obtains.
Import in first biological treatment of water of the second biological treating tank 1B, during residual a large amount of organism, this oxygenolysis will be carried out at the second biological treating tank 1B.Yet, among a large amount of second biological treating tank 1B that exist of animalcule, when Ruo Fashengyin bacterium and oxidation operation decompose, as the countermeasure of fleeing from the animalcule predation, known bacterium is to be difficult to the form propagation of prey, so the bacterial flora of propagation is not preyed on by animalcule, and these decomposition only rely on self-digestion, and the effect that lowers the mud generating capacity reduces.
Therefore, at the first biological treating tank 1A, preferably decomposing most of organic composition in the former water, also is more than 70% of former water BOD, preferred more than 80%, further preferred more than 90%, stably changes to thalline in advance.Therefore, the first biological treating tank 1A preferably fills the thermopnore formula of carrier.Be added on the carrier filling ratio of the first biological treating tank 1A when too high, do not disperse bacterium because do not generate, bacterial adhesion is at carrier or thread property bacterial multiplication, so being added on the carrier filling ratio of the first biological treating tank 1A is below 20%, be preferably below 10%, for example be preferably 3～10%, thus, do not influence concentration change, can generate the dispersion bacterium of easy predation.
The support shapes that is added on the first biological treating tank 1A is spherical arbitrarily, ingot shape (Pellet), hollow tube-shape, thread etc., and size also is advisable with the diameter of the following degree of 0.1～10mm.The material of carrier is natural materials, inorganic materials, macromolecular material etc. arbitrarily, also can use gelatinoid.
When the first biological treating tank 1A decomposes dissolved organic matter fully, do not generate clustering at the second biological treating tank 1B, and the nutrition of animalcule propagation usefulness is also not enough, becomes the dominant biological treating tank of the low mud of only densification.Therefore, the rate of decomposition of the organic composition of the first biological treating tank 1A is non-100%, is preferably below 95%.
The treating water of the first biological treating tank 1A (first biological treatment of water) water flowing to the second biological treating tank 1B at this, by oneself's decomposition and the animalcule predation of the oxygenolysis of residual organic composition, dispersed bacterium, carries out residual sludge reduction.The DO concentration of this second biological treating tank 1B just keeps the animalcule aspect, more than the preferred 1mg/L, and is preferably pH6～8, preferred especially 6.5～7.5 scope.
The second biological treating tank 1B decomposes because utilize than running of the slow-footed animalcule of bacterial multiplication and the oneself of bacterium, so preferably use animalcule and bacterium to rest on intrasystem operating condition and treatment unit.Therefore, at the second biological treating tank 1B, preferably carry out the activated sludge process of the separated sludge of loopback partly precipitated groove 2.Replace settling bath 2, also can adopt in the second biological treating tank 1B, the impregnated membranes module carries out the membrane sepn formula activated sludge process of solid-liquid separation to the biological treatment of water in the second biological treating tank 1B.Even this moment, the biological treatment of water in the second biological treating tank 1B is through solid-liquid separation, and loopback part solid-liquid separation mud is at the second biological treating tank 1B.
At the second biological treating tank 1B, by in aerator tank, adding or carrier being set, form thermopnore or fixed bed, can improve the interior maintenance dose of groove of animalcule.When making the second biological treating tank 1B form thermopnore, that the shape of adding carrier can be is spherical arbitrarily, ingot shape (Pellet), hollow tube-shape, thread etc., and size also is advisable with the diameter of 0.1～10mm degree.When making the second biological treating tank 1B form fixed bed, the carrier of setting is to use band shape, thread, short-movie shape, tabular etc. arbitrary shape.In thermopnore and the fixed bed any the time, the material of carrier is natural materials, inorganic materials, macromolecular material etc. arbitrarily, also can use gelatinoid.
At the second biological treating tank 1B, because need a large amount of animalcules of keeping to use standing ground, be more than 10% so add the filling ratio of carrier, preferred more than 20%, for example preferred 20～40%.
Among this second biological treating tank 1B,, also,, preferably SRT is made as necessarily 15～30 days scope internal control for drawing back the distance of animalcule or excrement in order to change animalcule groove mud (the second biological treating tank mud) termly.If when the SRT of the second biological treating tank 1B is too short, can not breeds fully mud decrement is effectively filtered predation type animalcule, if when long, aggregate predation type animalcule is taken place, and SS increases in the treating water.SRT by the second biological treating tank 1B is in aforementioned range, and the animalcule in the second biological treating tank 1B is to filter predation type animalcule to become advantage, keeps high water quality treatment, but and decrement mud.
Come since then that the treating water of the second biological treating tank 1B (second biological treatment of water) then carries out solid-liquid separation at settling bath 2, the part separated sludge is as loopback mud, and loopback is at the second biological treating tank 1B, divides dried uply as treating water, discharges outside system.
In the mode of Fig. 2, take out the mud of this settling bath 2 of part through solid-liquid separation, the mud that imports taking-up by oxide treatment, carries out further decrement to mud at aerobic condition at mud decrement groove 3.
In the mode of Fig. 2, mud decrement groove 3 is to replace organic property water, lead-in portion first biological treatment of water, but also lead-in portion organic drainage and part first biological treatment of water.
[treatment condition of mud decrement groove, processing mode]
In Fig. 1,2 mode, in mud decrement groove 3, the solid-liquid separation mud of lead-in portion settling bath 2 (also can be the mud of taking from biological treating tank as previously mentioned.), the mud so that the aerobic condition oxide treatment is imported carries out further decrement to mud.
In Fig. 1,2 the mode,, also can be first biological treatment of water of Fig. 2 mode by adding part at mud decrement groove 3(as previously mentioned as the organic drainage of former water.), give animalcule nutrition in the groove, in addition, in mud decrement groove 3, make the animalcule bacterial multiplication of predation easily, in mud decrement groove 3, make the effective animalcule propagation of mud decrement, can carry out stable mud decrement.
Also promptly, the mud of the biological treating tank 1 of Fig. 1 or the second biological treating tank 1B of Fig. 2 or its solid-liquid separation mud, group's polymer compound is many, so mud is when mud decrement groove 3 if import, and animalcule propagation is slack-off.
Among the present invention, directly add part organic drainage (and/or part first biological treatment of water) at mud decrement groove 3, head it off.
The organic drainage and/or first biological treatment of water are preferably added so that the organic matter sludges load of mud decrement groove 3 becomes 0.15g-COD in the interpolation of mud decrement groove 3
CrBelow/the g-VSS/d, preferred especially 0.05g-COD
CrBelow/the g-VSS/d.The organic matter sludges of mud decrement groove 3 is loaded when too high, and mud will take place.
At mud decrement groove 3, for making the effective animalcule propagation of mud decrement, mud decrement groove 3 is below the pH6, is preferably 5.0～6 especially, and the SRT of mud decrement groove 3 is more than 5 days, preferred especially 5～30 days, and preferred more especially 5～20 days.
Even at mud decrement groove 3, when similarly SRT is too short with aforesaid biological treating tank 1 or the second biological treating tank 1B, can not make and mud decrement is effectively filtered predation type animalcule breed fully, aggregate predation type animalcule is then taken place when long, treating water SS increases.SRT by mud decrement groove 3 is in aforementioned range, and the animalcules in the mud decrement groove 3 are to become advantage to filter predation type animalcule, can keep high water quality treatment, and decrement mud.
For mud decrement groove 3 is maximized, guarantee so long SRT, preferably at mud decrement groove 3, intermittently import mud and/or solid-liquid separation mud in the biological treating tank, stop to import mud during in, leave standstill the liquid in the mud decrement groove 3, carry out precipitate and separate, with the supernatant water of part by the precipitate and separate gained, loopback biological treating tank or discharge outside system as treating water, with the precipitating sludge of part by the precipitate and separate gained, loopback biological treating tank or the semicontinuous mode (SBR) of discharging outside system turn round.
The supernatant water of mud decrement groove 3 is the water of having carried out a biological disposal upon, and has fully good water quality treatment, can be used as treating water and releases.But the supernatant water of also loopback part mud decrement groove 3 is at biological treating tank, and other parts are as outside the treating water discharge system.
The supernatant water of loopback mud decrement groove 3 when biological treating tank, in the mode of Fig. 2, but the loopback first biological treating tank 1A, but the also loopback second biological treating tank 1B, the preferred loopback second biological treating tank 1B.Consider that in the viewpoint that promotes water quality treatment more the supernatant water of preferred loopback mud decrement groove 3 is to biological treating tank.
Because the precipitating sludge of mud decrement groove 3 is through decrement, enriched material fully, thus can directly discharge outside system as excess sludge, for giving processed.At this moment, all excess sludges of vote are only taken from mud decrement groove 3.The precipitating sludge of mud decrement groove 3, but this part of loopback at biological treating tank, and discharge section is outside system.The precipitating sludge of loopback mud decrement groove 3, is considered preferred loopback second biological treating tank in the mode of Fig. 2 from the viewpoint that keeps filtering predation type animalcule when biological treating tank.
To in processing cycle of the semicontinuous mode (SBR) of mud decrement groove 3 so, there is no particular restriction, gets final product with the degree that can guarantee the SRT that mud decrement groove 3 is necessary, but preferably carry out precipitate and separate with 1～2 day 1 time frequency usually.
[other modes]
Fig. 1, the 2nd, an example of expression embodiments of the present invention as long as the present invention is no more than this main idea, is not limited to any illustrated method.
For example, as the equipment for separating liquid from solid of biological treatment of water, except settling bath, also can use membrane separation unit or the floating separator tank etc. of going up.As described above, also can use the film immersion type biological treating tank that has biological treating tank and equipment for separating liquid from solid concurrently, carry out membrane sepn formula active sludge treatment.
Second mode as shown in Figure 2, the biological treating tank of disintegrating system in waste pipe can be more than 2 grooves, and above multistage of 3 grooves also can be set.At this moment, import and take from second biological treating tank biological treating tank afterwards, the mud of the biological treating tank of preferred last level and/or solid-liquid separation mud are to the mud decrement groove.During the precipitating sludge of loopback mud decrement groove, be recycled to the biological treating tank after second biological treating tank, loopback preferably is recycled to first biological treating tank during from the supernatant water of mud decrement groove.
Add organic drainage (and/or first biological treatment of water) when mud decrement groove 3, also can together add other synthetic draining.And then, also can together add nutrition agent described later.
Also can be provided with again accept the organic drainage and/or first biological treatment of water the other biological treatment trough as dispersion slot, therefore, make generation, add this at the mud decrement groove easily for the bacterium that animalcule preyed on, more promote animalcule propagation, also can promote the mud decrement effect more.As long as can disperse the bacterium groove to obtain the dominant treating water of non-coherency bacterium at this, can be method of operation arbitrarily, pH, temperature, residence time etc. are unrestricted.Can be in aerobic treatment, the anaerobic treatment any.Can be cultured continuously, also can be gradation and cultivate.Disperseing the bacterium of bacterium groove is directly to add, and also can concentrate the back and add.
Also can be by the device that the treating water of mud decrement groove is carried out solid-liquid separation is set, carry out the aerobic treatment method of loopback mud, or by thermopnore formula or membrane sepn formula aerobic treatment method to the interpolation carrier of mud decrement groove, the detention time of mud of lengthening mud decrement groove.
Become to be fit to animalcule propagation even set operating condition, if but do not contain the necessary composition that animalcule breeds in the former water, then animalcule does not breed, and the mud decrement effect does not promote yet.Therefore, also can be at second biological treating tank later biological treating tank or mud decrement groove, add nutrition agent, stable and keep animalcule, thus, stablize the effect of mud decrement.At this moment, can use phospholipid, free fatty acids, lysophospholipid matter, sterol or contain these Yelkin TTS as nutrition agent, in addition, can use the wine dregs of rice, the plant oil of liquid sugar, rice bran, beer oil meal, soybean extract, beet pulp, oyster shell whiting, eggshell, vegetables extract, flesh of fish extract, each seed amino acid, various VITAMIN etc. have a nutrition agent that promotes the metazoan cultivation effect.These can use independent a kind, also can mix more than 2 kinds and use.
When adding these nutrition agents, 0.5～10% degree of organism amount in the preferably former water of this addition.
At the mud decrement groove, because the ratio height of animalcule, other grooves of the mud of accepting to take from this mud decrement groove are set, carry out in anaerobic treatment, physical treatment, the chemical treatment any or the processing of making up these, mud can be dissolved, also can reach further minimizing.
Embodiment
Below enumerate embodiment and comparative example, be described more specifically the present invention.
Embodiment 1
As shown in Figure 2, use first biological treating tank (the not loopback mud of connection capacity as 3.6L, once by) 1A, and capacity be 15L second biological treating tank (loopback is from the mud of settling bath 2) 1B, and capacity be 5L settling bath 2, and capacity be the experimental installation of the mud decrement groove 3 of 3L, according to the present invention, handle organic drainage (COD with the flow of 0.9L/h
CrConcentration: 1000mg-COD
Cr/ L).The treatment condition of each biological treating tank as described later.
＜the first biological treating tank 1A＞
DO：0.5mg/L
Carrier filling ratio: 5%
COD
CrVolumetric loading: 6kg-COD
Cr/ m
3/ d
HRT：4h
pH：6.8
＜the second biological treating tank 1B＞
DO：4mg/L
The carrier filling ratio: 0%(does not have)
HRT：16.7h
SRT：23d
pH：6.8
＜mud decrement groove 3＞
DO：4mg/L
HRT：96h
SRT：16d
pH：6.0
In addition, use the carrier of sponge carrier as the first biological treating tank 1A.
In addition, all COD of device
CrVolumetric loading is 1.16kg-COD
Cr/ m
3/ d installs all HRT and turns round with 20.7h.
In the mud decrement groove 3, add the organic drainage of 100mL/d as the former water of conduct of matrix.By adding organic drainage in mud decrement groove 3, the organic matter sludges of mud decrement groove 3 load becomes 0.008g-COD
Cr/ g-VSS/d.
Take out 0.65L/d(2.6g-SS/d by the second biological treating tank 1B, mud (MLSS=4000mg/L) in groove SRT=23d) is added on mud decrement groove 3.But, once-a-day, stop the aeration of mud decrement groove 3, make sludge settling, take out 0.15L/d(1.5g-SS/d, mud (MLSS=10000mg/L) in groove SRT=16d) is discharged outside system.In addition, take out the supernatant liquor of 600mL/d, together release as treating water with the branch of settling bath 2 is dried up.
This result is that in the continuous operation more than month, the mud turnover ratio is 0.07kg-MLSS/kg-COD
Cr, the SS for the treatment of water is below the 20mg/L.
As shown in Figure 1, use connection capacity as the biological treating tank 1 of 15L, capacity as the settling bath 2 of 5L, and capacity as the experimental installation of the mud decrement groove 3 of 3L, according to the present invention, handle organic drainage (COD with the flow of 0.725L/h
CrConcentration: 1000mg-COD
Cr/ L).
＜biological treating tank 1＞
DO：4mg/L
The carrier filling ratio: 0%(does not have)
COD
CrVolumetric loading: 1.16kg-COD
Cr/ m
3/ d
HRT：20.7h
SRT：15d
pH：6.8
＜mud decrement groove 3＞
DO：4mg/L
HRT：60h
SRT：10d
pH：6.0
In the mud decrement groove 3, add the organic drainage of 200mL/d as the former water of conduct of matrix.By adding organic drainage in mud decrement groove 3, the organic matter sludges of mud decrement groove 3 load becomes 0.01g-COD
Cr/ g-VSS/d.
Take out 1.00L/d(4.0g-SS/d by biological treating tank 1, mud (MLSS=4000mg/L) in groove SRT=15d) is added on mud decrement groove 3.Once-a-day, stop the aeration of mud decrement groove 3, make sludge settling, take out 0.20L/d(2.0g-SS/d, precipitating sludge SRT=10d) (MLSS=10000mg/L) is discharged outside system.Take out the supernatant liquor of 1000mL/d, together release as treating water with the branch of settling bath 2 is dried up.
This result is that in the continuous operation more than month, the mud turnover ratio is 0.15kg-MLSS/kg-COD
Cr, treating water SS is 20mg/L.
Comparative example 1
At embodiment 1, be marked with the machine waste water at mud decrement groove 3 except being regardless of, when mud decrement groove 3 stops aeration, the amount of releasing is beyond the 500mL/d outside the system of the supernatant water of institute's precipitate and separate, when similarly handling, though treating water is good, the mud turnover ratio is 0.11kg-MLSS/kg-COD
Cr
Comparative example 2
At embodiment 2, be marked with the machine waste water at mud decrement groove 3 except being regardless of, when mud decrement groove 3 stops aeration, the amount of releasing is beyond the 800mL/d outside the system of the supernatant water of institute's precipitate and separate, when similarly handling, though treating water is good, the mud turnover ratio is 0.20kg-MLSS/kg-COD
Cr
Comparative example 3
At embodiment 2, except the mud decrement groove is not set, the SRT of biological treating tank is beyond the 12.5d, operation similarly, continuous operation is more than one month the time, though water quality treatment is good, but animalcule is taken place in the biological treating tank hardly, and the mud turnover ratio is 0.30kg-MLSS/kg-COD
Cr
Comparative example 4
At embodiment 2, except the mud decrement groove is not set, the SRT of biological treating tank is beyond the 40d, operation similarly, and continuous operation is more than one month the time, and the mud turnover ratio is 0.19kg-MLSS/kg-COD
Cr, reduce a little than comparative example 3, but the sufficient wheel animalcule of palpus that belongs to aggregate predation type animalcule that 20000/mL takes place in the mud in the groove, it is 50mg/L that treating water SS worsens.
Comparative example 5
At embodiment 1, except the mud decrement groove is not set, the SRT of second biological treating tank is beyond the 12.5d, operation similarly, continuous operation is more than one month the time, though water quality treatment is good, runner worm (Rotaria rotatoria) number that filters predation type animalcule belonging in second biological treating tank rests on 3000/mL, and the mud turnover ratio is 0.21kg-MLSS/kg-COD
Cr
Comparative example 6
At embodiment 1, except the mud decrement groove is not set, the SRT of biological treating tank is beyond the 40d, operation similarly, and continuous operation is more than one month the time, and the mud turnover ratio is 0.12kg-MLSS/kg-COD
Cr, reduce a little than comparative example 5, but the sufficient wheel animalcule of palpus that belongs to aggregate predation type animalcule that 30000/mL takes place in the mud in second biological treating tank, it is 70mg/L that treating water SS worsens.
The result of previous embodiment 1,2 and comparative example 1～6 is summarized in table 1.
Table 1
Biological treating tank 1 among the second biological treating tank 1B, Fig. 1 among ※ Fig. 2.
By above result as can be known,, can keep high water quality treatment, processing efficiency, and significantly lower the excess sludge generating capacity according to the present invention.
Industrial applicibility
The bioremediation of organic drainage of the present invention is can utilize in the concentration range that comprises living drainage, water drain water, food factories or the paper pulp workshop processing of organic drainage widely.
Though use ad hoc fashion to explain the present invention, those skilled in the art understand that under the situation of not vagus escape the object of the invention and scope various variations can be arranged.
In addition, the application is based on that the Japanese patent application (the special 2010-267006 of hope) that proposed on November 30th, 2010 proposes, and quotes its all content in this mode by reference.
Claims (12)
1. the bioremediation of an organic drainage, it imports biological treating tank with organic drainage and carries out active sludge treatment, and biological treatment of water carried out solid-liquid separation, the part of solid-liquid separation mud is recycled to this biological treating tank, and take out the part of interior mud of this biological treating tank and/or solid-liquid separation mud and the mud that takes out is imported the mud decrement groove and under aerobic condition, handle the decrement of carrying out mud by bio-oxidation, it is characterized in that
The part of aforementioned organic drainage is imported this mud decrement groove.
2. the bioremediation of organic drainage as claimed in claim 1, wherein,
It is so that the SRT of aforementioned biological treating tank becomes the part that 15～30 days mode is taken out mud in the aforementioned biological treating tank and/or solid-liquid separation mud, handles with the condition that the SRT of aforementioned mud decrement groove became more than 5 days.
3. the bioremediation of an organic drainage, its with organic drainage water flowing in regular turn to the multistage biological treating tank that is provided with more than the secondary, with the disposable water flowing of organic drainage to first biological treating tank that is provided with in the multistage biological treating tank, carry out a biological disposal upon by bacterium, to carry out active sludge treatment at second biological treating tank from first biological treatment of water that contains bacterium of first biological treating tank, and the biological treatment of water of the biological treating tank of final level carried out solid-liquid separation, the part of solid-liquid separation mud is recycled to the later biological treating tank of this second biological treating tank, and, the part of mud and/or solid-liquid separation mud imports the mud decrement groove and handle the decrement of carrying out mud by bio-oxidation under aerobic condition in the biological treating tank that this second biological treating tank is later, it is characterized in that
The part of the aforementioned organic drainage and/or first biological treatment of water is imported this mud decrement groove.
4. the bioremediation of organic drainage as claimed in claim 3, wherein,
It is so that the SRT of the later biological treating tank of aforementioned second biological treating tank becomes the part that 15～30 days mode is taken out mud in the later biological treating tank of aforementioned second biological treating tank and/or solid-liquid separation mud, handles with the condition that the SRT of aforementioned mud decrement groove became more than 5 days.
5. as the bioremediation of each described organic drainage in the claim 1 to 4, wherein,
It is so that the organic matter sludges load of aforementioned mud decrement groove becomes 0.15g-COD
CrThe following mode of/g-VSS/d imports this mud decrement groove with the aforementioned organic drainage and/or first biological treatment of water.
6. as the bioremediation of each described organic drainage in the claim 1 to 4, wherein,
It intermittently carries out mud in the biological treating tank and/or solid-liquid separation mud are imported aforementioned mud decrement groove, and stop to import mud during in, liquid in this mud decrement groove left standstill carry out precipitate and separate, and will be recycled to aforementioned biological treating tank by the part of the resulting supernatant water of this precipitate and separate or outside system, discharge, will be recycled to aforementioned biological treating tank by the part of the resulting precipitating sludge of this precipitate and separate or outside system, discharge as treating water.
7. the biological treatment device of an organic drainage, it possesses: accept organic drainage to carry out the biological treating tank of active sludge treatment, to carry out the equipment for separating liquid from solid of solid-liquid separation from the biological treatment of water of this biological treating tank, will with this equipment for separating liquid from solid the part of isolating solid-liquid separation mud be recycled to the mud send-back device of this biological treating tank, take out the mud withdrawing device of the part of interior mud of this biological treating tank and/or solid-liquid separation mud, and accept the mud that takes out and under aerobic condition, handle the mud decrement groove that carries out mud decrement by bio-oxidation, it is characterized in that
It has the device that the part of aforementioned organic drainage is imported this mud decrement groove.
8. the biological treatment device of organic drainage as claimed in claim 7, wherein,
It is so that the SRT of aforementioned biological treating tank becomes the part that 15～30 days mode is taken out mud in the aforementioned biological treating tank and/or solid-liquid separation mud by aforementioned mud withdrawing device, so that the condition that the SRT of aforementioned mud decrement groove became more than 5 days is handled.
9. the biological treatment device of an organic drainage, it possesses: biological treating tank, this biological treating tank be organic drainage water flowing in regular turn be provided with the above multistage biological treating tank of secondary, first biological treating tank in being provided with multistage biological treating tank is the groove that organic drainage is carried out a biological disposal upon by bacterium with disposable water flowing, and second biological treating tank is to have to carry out the groove of active sludge treatment from first biological treatment of water that contains bacterium of first biological treating tank; The biological treatment of water of final grade biological treating tank is carried out the equipment for separating liquid from solid of solid-liquid separation; Will with this equipment for separating liquid from solid the part of isolating solid-liquid separation mud be recycled to the mud send-back device of the later biological treating tank of this second biological treating tank; Take out the mud withdrawing device of the part of interior mud of the later biological treating tank of this second biological treating tank and/or solid-liquid separation mud; And the mud that accept to take out handles the mud decrement groove of the decrement of carrying out mud by bio-oxidation under aerobic condition, it is characterized in that,
It has the device that the part of the aforementioned organic drainage and/or first biological treatment of water is imported this mud decrement groove.
10. the biological treatment device of organic drainage as claimed in claim 9, wherein,
It is so that the SRT of the later biological treating tank of aforementioned second biological treating tank becomes the part that 15～30 days mode is taken out mud in the later biological treating tank of aforementioned second biological treating tank and/or solid-liquid separation mud by aforementioned mud withdrawing device, handles with the condition that the SRT of aforementioned mud decrement groove became more than 5 days.
11. as the biological treatment device of each described organic drainage in the claim 7 to 10, wherein,
It is so that the organic matter sludges load of aforementioned mud decrement groove is 0.15g-COD
CrThe following mode of/g-VSS/d imports this mud decrement groove with the aforementioned organic drainage and/or first biological treatment of water.
12. as the biological treatment device of each described organic drainage in the claim 7 to 10, wherein,
It intermittently carries out mud in the biological treating tank and/or solid-liquid separation mud are imported aforementioned mud decrement groove, and stop to import mud during in, liquid in this mud decrement groove left standstill carry out precipitate and separate, and have: the part of supernatant water that will be by this precipitate and separate gained is recycled to the device of aforementioned biological treating tank and/or the device that the part of this supernatant water is discharged outside system as treating water, and the part of precipitating sludge that will be by this precipitate and separate gained is recycled to the device of aforementioned biological treating tank and/or the device that the part of this precipitating sludge is discharged outside system.
Applications Claiming Priority (3)
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| JP2010-267006 | 2010-11-30 | ||
| JP2010267006A JP2012115754A (en) | 2010-11-30 | 2010-11-30 | Method and apparatus for biologically treating organic wastewater |
| PCT/JP2011/076863 WO2012073752A1 (en) | 2010-11-30 | 2011-11-22 | Method and apparatus for biologically treating organic wastewater |
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