CN102963976A - Organic wastewater processing method and organic wastewater processing system - Google Patents
Organic wastewater processing method and organic wastewater processing system Download PDFInfo
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- CN102963976A CN102963976A CN2011102641961A CN201110264196A CN102963976A CN 102963976 A CN102963976 A CN 102963976A CN 2011102641961 A CN2011102641961 A CN 2011102641961A CN 201110264196 A CN201110264196 A CN 201110264196A CN 102963976 A CN102963976 A CN 102963976A
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Abstract
The invention provides an organic wastewater processing method and an organic wastewater processing system, which use less energy to keep the water quality of the wastewater to be processed, inhibit the generation of residual sludge or reduce the residual sludge, and is suitable for restriction place existed on the ground such as a metropolis circle. The organic wastewater processing method is characterized in that the organic wastewater and the activated sludge are mixed and stirred, a mixed liquor of the organic wastewater and the activated sludge is performed aeration, the mixed liquor after aeration is performed solid-liquid separation into treating water and the activated sludge, a part or all of the activated sludge after solid-liquid separation and the organic wastewater are performed aeration in a contact mode, wherein the activated sludge after aeration through the aeration process is sent to the above mixing stirring process for mixing and stirring.
Description
Technical field
The present invention relates to a kind for the treatment of process and organic drainage treatment system of organic drainage.More specifically, the present invention relates to a kind of reduction that can solve the removing of nitrogen, excess sludge, and the processing of organic drainage in treatment process and the organic drainage treatment system of organic drainage of the such problem of the reduction of required energy.
Background technology
As family's draining, industrial water drainage etc., water drain water etc. comprise the dirty material of Organic draining (below, in this manual, be called " organic drainage ".) one for the treatment of process, activated sludge process is arranged.Activated sludge process is to use active sludge (mixed systems of the microorganisms such as the bacterium of decomposing organic matter, mushroom, protozoon) to process the method for organic drainage.There is multiple-microorganism (aerobic microorganism, anaerobion etc.) in this active sludge.In the activated sludge process of standard, in the biological reaction tank that is provided with active sludge, supply with organic drainage, the limit is diffusion of oxygen in this biological reaction tank, stir on the limit, thus, make oxygen dissolution in organic drainage, supply with the movable necessary oxygen of above-mentioned aerobic microorganism etc.Need to prove, in this specification sheets, the process that makes oxygen dissolution in liquid is called " aeration ".The uses such as aerobic microorganism are dissolved in the oxygen (dissolved oxygen) in the organic drainage, with organic dirty material (below, in this manual, be called " organism ".) oxygenolysis is CO
2And H
2O simultaneously, breeds and the throw out of formation floatability.The mixed solution of the organic drainage of carrying out a biological disposal upon as mentioned above and active sludge is imported in the settling tank of back segment.Then, leave standstill this mixed solution, making it settlement separate is supernatant liquor and active sludge.After this supernatant liquor carried out disinfection etc., be put in the river etc. as processing current.On the other hand, part or all of the settlement separate active sludge that obtains is back in the biological reaction tank, remainingly processes as excess sludge.
Above-mentioned activated sludge process is widely used in long time in the organic drainage treatment facility centered by metropolitan region.But, produce in the metropolitan region of 100,000 tons～1,000,000 tons of organic drainages in for example every day, follow the variation of rapid social environment in recent years, produced the problem that existing activated sludge process can not be dealt with.For these problems, although various solutions, method have been proposed,, particularly in metropolitan region, exist land used to guarantee restricted problem, the construction of new treatment facility, treatment facility significantly transform or arranging etc. for the treatment of unit is difficult in reality.And organic drainage every day all discharges from family and factory, therefore, and for reforming processing facility significantly or new treatment unit is set and the running that stops treatment facility also is unpractical.That is, particularly in metropolitan region, " how effectively suppressing the problems referred to above in limited land area " is one of large problem in the treatment facility of organic drainage in recent years.In addition,, consider from the viewpoint of cutting down the expense that produces in order to obtain land used etc. and carrying capacity of environment etc. with hard-core place on the ground at present, also wish to develop the method that effectively suppresses the problems referred to above.
At first, first problem removing for nitrogen contained in the draining from family or factory.It is low that the nitrogen of existing treatment facility is removed rate, processes the major cause that remaining nitrogen in the water becomes the water quality deterioration of discharging the river of processing water etc.As the method that addresses this problem, can enumerate so-called biology denitrogenation.But, when aforesaid method is cooperated with activated sludge process, nitration reaction groove and denitrifying tank need to be set in addition, it is relatively more difficult that these devices or reforming processing facility newly are set in the treatment facility of the metropolitan region that is subject to the land used restriction.In addition, in the treatment facility of the metropolitan region that must process in a large number at short notice a large amount of organic drainages, be difficult to adopt as the biology denitrogenation the repeatedly method of aerobic treatment and anaerobic treatment, even perhaps adopt, for such treatment facility that turns round, also need a lot of energy and expense.
Second Problem is for suppressing the generation of excess sludge.Particularly under aerobic condition, aerobic microorganism is when contained oxidation operation decomposes in organic drainage, absorption, predation organism and breed.Generally speaking, the propagation during organic substance decomposing that microorganism causes is inevitably, and therefore, when using the Wastewater Treated by Activated Sludge Process organic drainage, the amount of active sludge increases, and produces excess sludge.In addition, as mentioned above, for except denitrification, need to repeatedly repeat anaerobic treatment, aerobic treatment, therefore, the generation of excess sludge may increase.Because the excess sludge that the processing organic drainage produces is processed via dehydration, drying, burning etc., but this installation cost that need to cost a lot of money and handling.As the method that addresses this problem, following method being disclosed: adds alkaline agent in excess sludge, the method (Japanese Laid-Open Patent Publication: JP 2002-113487 number) of processing with line mixer; And by being set, long pond carries out the autoxidizable method that aeration promotes microorganism; The treatment process such as ozonize, membrane sepn, these methods after all need expense and installation cost, the needed a lot of energy of processing and the place etc. for the treatment of agent.In addition, for example also there is following method: the mud concentrating and digesting groove is set in treatment facility, using membrane separation unit that above-mentioned excess sludge is carried out high density concentrates, with this concentrated excess sludge that obtains aeration and stirring in described mud concentrating and digesting groove, thus the method (Japanese Laid-Open Patent Publication: JP 2000-263093 number) that the solids component amount of excess sludge is reduced.But, the method must arrange the treatment facility mud concentrating and digesting groove that is used for cutting down excess sludge in addition of organic drainage, in addition, in order to reduce the amount of excess sludge, need to be in the mud concentrating and digesting groove for a long time with the active sludge aeration and stir or carry out several aeration and stirring.Therefore, the reduction of excess sludge becomes one of problem great in the environment protection.
The 3rd the needed energy of processing that problem is organic drainage and excess sludge.As mentioned above, the water quality of processing water improves, reaches a lot of energy of processing needs of excess sludge.Particularly in the existing activated sludge process, the aeration in the biological reaction tank needs very many energy.That is, because oxygen generally is difficult to be dissolved in the water, in order in liquid, to supply with the movable needed dissolved oxygen of (dissolving) above-mentioned aerobic microorganism etc., need to spread a large amount of oxygen or spread thin bubble.In addition, in the activated sludge process, in the process of active sludge treatment organic drainage, need aeration, and must continue for a long time aeration.The energy major part that consumes when utilizing as mentioned above the Wastewater Treated by Activated Sludge Process organic drainage is used when aeration, needs very large energy for this reason.And, because these energy 100% be electric energy almost, therefore, the very large expense of the running for the treatment of facility needs.
In sum, keep the water quality of processing water, suppress the generation of excess sludge and cut down these that to process required expense be very difficult.In addition, when wanting to solve any in above-mentioned three problems, will produce other problem.Particularly in the today that requires energy-conservation, power saving, reduction to the load of environment, demand urgently developing a kind of can with few energy keep water quality and the generation that suppresses excess sludge of processing water or cut down excess sludge and also go for metropolitan region such have a method with the place of restriction on the ground.
The look-ahead technique document
Patent documentation
Patent documentation 1: Japanese Laid-Open Patent Publication JP 2002-113487 number
Patent documentation 2: Japanese Laid-Open Patent Publication JP 2000-263093 number
Summary of the invention
The problem that invention will solve
The present invention is in view of the above problems and the invention of carrying out, its purpose is, provides can seek except denitrification, cut down excess sludge, and reduce treatment process and the organic drainage treatment system that organic drainage is processed the organic drainage of needed energy and carrying capacity of environment.
For the scheme of dealing with problems
The invention provides a kind for the treatment of process of organic drainage, it is characterized in that, comprise following operation: the mix and blend operation that organic drainage and active sludge are mixed and stir; Aeration operation with the mixed solution aeration of the organic drainage of this mix and blend gained and active sludge; The mixed solution solid-liquid separation that this aeration is crossed is to process the solid-liquid separation process of water and active sludge; Make part or all of active sludge of this solid-liquid separation gained not carry out contiguously the empty aeration operation of aeration with described organic drainage, wherein, will send back in the described mix and blend operation by the active sludge that this sky aeration operation is carried out aeration and carry out mix and blend.
Further feature of the present invention is, in described empty aeration operation, makes part or all self-digestion of active sludge, makes the nitrogen component that produces by this self-digestion via ammonia-state nitrogen nitrated state or nitric nitrogen for nitrite nitrogen and nitric nitrogen coexistence.Ammonia-state nitrogen contained in the described active sludge that is sent back in the mix and blend operation is preferably less than 20mg/L.
In addition, further feature of the present invention is, in described mix and blend operation, active sludge uses in bonded oxygen contained in the state that produce in described empty aeration operation, the coexistence of nitrite nitrogen and nitric nitrogen or the nitric nitrogen contained bonded oxygen to process organic drainage.And, after preferably contained bonded oxygen is consumed by described active sludge in contained bonded oxygen or the nitric nitrogen in the state of the contained nitrite nitrogen of the mixed solution of mixed stirring and nitric nitrogen coexistence in described mix and blend operation, keep the anaerobic state of certain hour.In addition, more preferably keep this anaerobic state more than 4 hours.
And then, further feature of the present invention is, the treatment process of above-mentioned organic drainage, it further comprises and will carry out the enrichment process that contained moisture is removed in part or all of active sludge of solid-liquid separation gained by described solid-liquid separation process, and, this active sludge of having removed moisture is carried out aeration in described empty aeration operation.
In addition, further feature of the present invention is, the treatment process of above-mentioned organic drainage, its further comprise the active sludge that carries out the solid-liquid separation gained by described solid-liquid separation process part or all carry out the digestion process operation of digestion process, and the supernatant liquor that the active sludge solid liquid that this digestion process is crossed is separating obtained carries out aeration in described empty aeration operation.
In addition, the treatment process of organic drainage of the present invention is characterised in that, comprises following operation: the mix and blend operation that organic drainage and active sludge are mixed and stir; Aeration operation with the mixed solution aeration of the organic drainage of this mix and blend gained and active sludge; The mixed solution solid-liquid separation that this aeration is crossed is to process the solid-liquid separation process of water and active sludge; Part or all of the active sludge of this solid-liquid separation gained carried out the digestion process operation of digestion process; Contained ammonia-state nitrogen is nitrated in the supernatant liquor that the active sludge solid liquid that this digestion process is crossed is separating obtained is nitrite nitrogen and the state of nitric nitrogen coexistence or the nitrated operation of nitric nitrogen, and, send the supernatant liquor of this nitrated mistake back to described mix and blend operation and carry out mix and blend.
And then organic drainage treatment system of the present invention is characterised in that to possess with lower device: with organic drainage water intaking and pretreatment unit that solid matter contained in this organic drainage is removed; The mixed stirring device that the described organic drainage that will send out from this pretreatment unit and active sludge mix and stir; The aerating apparatus of the described organic drainage that will send out from this mixed stirring device and the mixed solution aeration of active sludge; The described mixed solution solid-liquid separation that to send out from this aerating apparatus is to process the equipment for separating liquid from solid of water and active sludge; The concentrating unit that contained moisture is removed part or all of the described active sludge that will send out from this equipment for separating liquid from solid; Make the described active sludge of having removed moisture of sending out from this concentrating unit not carry out contiguously aeration with described organic drainage, and send the empty aerating apparatus of described mixed stirring device back to.
The effect of invention
The present invention has brought into play can realize removing denitrification, cut down excess sludge, reach the reduction organic drainage processes needed energy and the such effect of carrying capacity of environment.
Particularly, according to the present invention, make by solid-liquid separation process carry out the active sludge of solid-liquid separation gained or remove that moisture concentrates the active sludge that obtains or these two kinds of active sludge by enrichment process part or all not with organic drainage carry out contiguously aeration (below, in this manual, such aeration is called " empty aeration ".)。Thus, be in the beginning autoxidation decomposition such as aerobic microorganism contained in the active sludge that does not have under the new organic state, the oxidized decomposition of the part of active sludge.The nitrogen component of stripping this moment changes state or the nitric nitrogen of nitrite nitrogen and nitric nitrogen coexistence into via ammonia-state nitrogen by empty aeration.And when the active sludge that empty aeration is crossed was sent back to the mix and blend operation, contained amphimicrobe utilized bonded oxygen contained in these nitrite nitrogens, the nitric nitrogen to come the oxygenolysis organism in the active sludge.At this moment, in oxygenolysis, generate nitrogen etc. by nitrite nitrogen, nitric nitrogen, cause denitrogenation.Like this, active sludge utilizes described bonded oxygen that the situation of organic substance decomposing is compared the situation of organic substance decomposing with utilizing dissolved oxygen, can significantly suppress the propagation of active sludge.And then, because active sludge uses described bonded oxygen with organic substance decomposing, therefore, need not to carry out the aeration for supplying with dissolved oxygen, can reduce the needed energy of processing of organic drainage.In addition, can together carry out removing of nitrogen with organic oxygenolysis, can effectively process organic drainage.
In addition, although the mixed solution to active sludge and organic drainage carries out aeration in the aeration operation,, based on following two reasons, can suppress the propagation of active sludge.At first, first reason is that in the moment that is transferred to the aeration operation, most of organism contained in the organic drainage is decomposed, adsorbs or predation by active sludge by the mix and blend operation of leading portion.Thus, can suppress the activity of the active sludge in the aeration operation, suppress the propagation of active sludge.Second reason is, in the aeration operation, mainly is the low nitrobacteria of proliferation rate (group) decomposing organic matter.Aeration operation of the present invention mainly is to arrange in order to process the dirty material that can not process in the mix and blend operation (such as ammonia-state nitrogen contained in tensio-active agent, the organic drainage etc.) under aerobic condition, when processing these dirty materials and removing nitrogen component, mainly be that above-mentioned nitrobacteria (group) plays a role, the propagation that also can suppress in this, the active sludge in the aeration operation.
As mentioned above, according to the present invention, do not need treatment agent and unnecessary processing energy to decompose to cut down a certain amount of active sludge by the autoxidation of active sludge in the empty aeration, simultaneously, the propagation that can suppress the active sludge in the treatment process (mix and blend operation, aeration operation) of organic drainage thereafter can suppress the generation of active sludge in the whole treatment process.Need to prove, usually, carried out the active sludge of empty aeration because the throw out disintegration, and cause and be difficult to solid-liquid separation in thereafter the solid-liquid separation process for processing water and the such problem of active sludge, but in the situation of the treatment process of organic drainage of the present invention, by mix and blend operation or the aeration operation of back segment, microorganism forms throw out again, therefore, can suppress such problem.And then, according to the treatment process of organic drainage of the present invention, nitration reaction groove or denitrifying tank are not set in addition can carry out denitrogenation.
Need to prove that above-mentioned biology denitrogenation all is to use contained ammonia-state nitrogen in the organic drainage all the time, (to remove this ammonia-state nitrogen as purpose) produces nitrite nitrogen, nitric nitrogen in nitrifying groove, carry out denitrogenation in denitrifying tank.The present invention makes organic drainage but specially makes active sludge carry out that autoxidation is decomposed and produce ammonia-state nitrogen and make that this ammonia-state nitrogen is nitrated to be nitrite nitrogen, nitric nitrogen, and being used for the processing of the organic drainage that undertaken by active sludge, the present invention has very large difference with simple biology denitrogenation in this.
In addition, usually, excess sludge is the block of microorganism, therefore, it with under the state that air (oxygen) contact is not being buried and wait when processing contained aerobic microorganism death in the excess sludge and generation foreign odor.But, among the present invention, to compare with aerobic microorganism contained in the active sludge, amphimicrobe propagation is more, therefore, when this active sludge is processed as excess sludge, also can suppress the generation because of the dead foreign odor that causes of aerobic microorganism.And then particularly in metropolitan region, the present invention need not significantly to transform existing treatment facility can solve above-mentioned problem.
Description of drawings
Fig. 1 is the figure of an embodiment of the treatment process of conceptual expression organic drainage of the present invention.
Fig. 2 is the figure of other embodiment (1) of the treatment process of conceptual expression organic drainage of the present invention.
Fig. 3 is the figure of other embodiment (2) of the treatment process of conceptual expression organic drainage of the present invention.
Fig. 4 is the figure of other embodiment (3) of the treatment process of conceptual expression organic drainage of the present invention.
Fig. 5 is the figure of other embodiment (4) of the treatment process of conceptual expression organic drainage of the present invention.
Fig. 6 is the figure of other embodiment (5) of the treatment process of conceptual expression organic drainage of the present invention.
Fig. 7 is the sketch chart of the biological culture groove that uses in other embodiment (5) for the treatment of process of organic drainage of the present invention.
Fig. 8 is the sketch chart of expression one embodiment of the invention.
Fig. 9 is the figure of the treatment scheme of the same embodiment of conceptual expression.
Embodiment
Below, with reference to accompanying drawing one embodiment of the present invention is described.
Fig. 1 is the figure of an embodiment of the treatment process of conceptual expression organic drainage of the present invention, and expression comprises mix and blend operation 110, aeration operation 120, solid-liquid separation process 130, and the treatment process of the organic drainage of empty aeration operation 140.
In present embodiment and other embodiment described later, before organic drainage is transferred to mix and blend operation 110, can carry out pre-treatment by pretreatment process.In this pretreatment process, will fetch water from the organic drainage that family or factory etc. discharge, separate wherein contained solid matter.Particularly, for example, use filter screen or settling pit etc. to remove large solid matter contained in the organic drainage, be separated into solid matter and the organic drainage that is transferred in the mix and blend operation.In addition, as required, in further this organic drainage is packed into settling tank or the separating centrifuge, settlement separate residual solid matter.Need to prove, in the pretreatment process, can suitably use other solid separation method.
In the mix and blend operation 110, use the mix and blend groove that for example possesses whipping appts to carry out mix and blend.Particularly, use whipping appts, the active sludge that under the state of ingress of air (oxygen) not, mechanically possesses in advance in mix and blend organic drainage and this mix and blend groove.Thus, make in the mixed solution of above-mentioned organic drainage and active sludge not comprise dissolved oxygen, obtain the condition that has energetically nitrite nitrogen, nitric nitrogen described later.Here, in the existing activated sludge process, usually, in with organic drainage and active sludge aeration, carry out mix and blend, do not carry out aeration in the mix and blend operation 110 in present embodiment and other embodiment described later, therefore, can make the needed energy of mix and blend be reduced to about 1/5th of above-mentioned aeration mix and blend.
In the aeration operation 120, use the aerator tank that for example possesses air-diffuser to carry out aeration.Particularly, in aerator tank, transfer the active sludge of mix and blend gained in the mix and blend operation 110 and the mixed solution of organic drainage, use air-diffuser with this mixed solution aeration.
In the solid-liquid separation process 130, the mixed solution solid-liquid separation that aeration in the aeration operation 120 is crossed is solid matter (active sludge) and processes water.Method as solid-liquid separation has following methods: mixed solution is packed in the settling tank, make the settlement separate method for supernatant liquor (processing water) and solid matter of mixed solution; The use beds of precipitation, filtering membrane, microbial film, separating centrifuge etc. are separated into the method for processing water and active sludge etc.Need to prove, in the solid-liquid separation process 130, can suitably use other solid separation method.The processing water of solid-liquid separation gained can be discharged in the public waters or as miscellaneous waters such as process waters through sterilization and recycle in the solid-liquid separation process 130.In addition, the part of the active sludge of solid-liquid separation gained is shifted in the sky aeration operation 140, for remainder, suitably processes.Need to prove that the active sludge that is transferred to sky aeration operation 140 also can contain moisture.In addition, also the active sludge of solid-liquid separation gained all can be transferred to sky aeration operation 140.
In the empty aeration operation 140, use the empty aerator tank that for example possesses air-diffuser to carry out aeration.Particularly, to the active sludge of solid-liquid separation gained in the solid-liquid separation process 130 part or all, in empty aerator tank, do not carry out contiguously aeration with organic drainage, perhaps, carry out as required aeration and stirring.Then, send the active sludge that has carried out empty aeration in the empty aeration operation 140 back to mix and blend operation 110.Need to prove, also can in above-mentioned empty aerator tank, add in advance moisture (not being organic drainage), together carry out the sky aeration with above-mentioned active sludge.Also can send the mixed solution of this active sludge and moisture back to mix and blend operation 110.
Decomposed by autoxidation by the part that empty aeration operation 140 has been carried out the active sludge of empty aeration, the nitrogen component of stripping this moment is nitrated via ammonia-state nitrogen to be state or the nitric nitrogen of nitrite nitrogen and nitric nitrogen coexistence.The residence time of the active sludge in the empty aeration operation 140, and aeration intensity according to the character of the character of organic drainage and active sludge and difference is preferably adjusted less than the mode of 0.5mg/L with ammonia-state nitrogen contained in the active sludge that is sent back to mix and blend operation 110.When contained ammonia-state nitrogen is less than 0.5mg/L in the active sludge, can judge, produce nitrite nitrogen or nitric nitrogen that active sludge in mix and blend operation 110 (in contained amphimicrobe) decomposes the required sufficient amount such as organism contained in the organic drainage.
In the mix and blend operation 110 of sending the active sludge that in empty aeration operation 140, has carried out empty aeration back to, in the mix and blend groove, there are energetically nitrite nitrogen, nitric nitrogen.The active sludge that is present in the mix and blend groove decomposes organism contained in the organic drainage with bonded oxygen contained in above-mentioned nitrite nitrogen, the nitric nitrogen.As mentioned above, during the active sludge decomposing organic matter, active sludge is bred by adhering to, prey on organism.But amphimicrobe utilizes the situation of bonded oxygen decomposing organic matter to compare the amount of the active sludge that can suppress to breed with the situation of the use dissolved oxygen decomposing organic matters such as aerobic microorganism.
Fig. 2 is illustrated in the mix and blend operation 110 of Fig. 1, after active sludge consumes above-mentioned bonded oxygen by organic decomposition or predation etc., and the treatment process of the organic drainage of the anaerobic state of maintenance certain hour.Except the mix and blend operation, the treatment process of all the other and organic drainage shown in Figure 1 is same, therefore, gives prosign and have the operation of same function that description thereof is omitted.
In the mix and blend operation 210 of Fig. 2, same with the mix and blend operation 110 of Fig. 1, use the mix and blend groove that possesses whipping appts to carry out mix and blend.And, for the active sludge in utilizing the mix and blend groove consumes the anaerobic state that keeps certain hour behind the contained above-mentioned bonded oxygen of the mixed solution of organic drainage and active sludge, partition 211 is set in the mix and blend groove.Thus, can obtain above-mentioned state and the anaerobic state that has bonded oxygen.Keep like this certain hour anaerobic state the reasons are as follows described: namely, as mentioned above, in the mix and blend groove, do not have dissolved oxygen.At this moment, particularly aerobic microorganism can not breathe, organic decomposition, and the predation, be absorbed in starvation.Therefore, rapidly active sludge is being transferred in the situation of aeration operation 120 subsequently, contained dissolved oxygen carries out the burst breeding in the aerator tank of aerobic microorganism use aeration operation 120, and the generation of excess sludge is increased.
In addition, the mix and blend groove preferably is made as the capacity (residence time of the mixed solution of active sludge and organic drainage) of mix and blend groove that above-mentioned bonded oxygen contained in the mix and blend groove is consumed the anaerobic state of rear maintenance certain hour.And then more preferably above-mentioned anaerobic state keeps more than 4 hours.Need to prove, under the above-mentioned anaerobic state, in fact do not detect nitrite nitrogen and nitric nitrogen, also is the trace degree even detect.
In the present embodiment, in order in the mix and blend groove, to obtain above-mentioned state and the anaerobic state that has bonded oxygen, partition 211 is set in the mix and blend groove.But, except partition 211 is set, can also obtain aforesaid state by for example adjusting the residence time of active sludge in the mix and blend groove.
Fig. 3 represents the part of carrying out the active sludge that solid-liquid separation obtains in solid-liquid separation process 130 of Fig. 1 and Fig. 2 is transferred to enrichment process 350, after removing moisture contained in the active sludge, be transferred to the treatment process of the organic drainage of sky aeration operation 140.Except enrichment process 350, same with the treatment process of Fig. 1 or organic drainage shown in Figure 2, therefore, give prosign and description thereof is omitted.
As the dewatering that carries out in the enrichment process 350, such as the centrifugal separation that machineries such as using vacuum hydroextractor, centrifuge, pressure filter is arranged, filtration method etc.Need to prove, in the enrichment process 350, can suitably use other dewatering.And, remove in the enrichment process 350 that moisture concentrates and the part of the active sludge that obtains is transferred to sky aeration operation 140, for remainder, suitably process.The concentrated active sludge that obtains reduces with concentrated front phase specific volume in the enrichment process 350, and it is large that the proportion of solids component (microorganism) becomes.Therefore, compare with the situation that comprises moisture, can make in the sky aeration operation 140 residence time of microorganism in empty aerator tank elongated.The autoxidation that thus, can improve the microorganism in the empty aeration operation 140 is decomposed and the nitrated nitrated rate for nitrite nitrogen, nitric nitrogen of ammonia-state nitrogen.Need to prove, can all be transferred to sky aeration operation 140 with concentrating the active sludge that obtains.
Fig. 4 represents the part of carrying out the active sludge that solid-liquid separation obtains in solid-liquid separation process 130 of above-mentioned Fig. 1 to Fig. 3 is carried out digestion process by digestion process operation 460, and the supernatant liquor that the active sludge that digestion process is crossed is carried out the solid-liquid separation gained by the second solid-liquid separation process 470 is transferred to the treatment process of the organic drainage of sky aeration operation 140.Except digestion process operation 460 and the second solid-liquid separation process 470, all the other and Fig. 1 are same to the treatment process of organic drainage shown in Figure 3, give prosign and description thereof is omitted.
As the digestion process method of in digestion process operation 460, carrying out, for example can enumerate following method: the maintenance both do not had dissolved oxygen also not have bonded oxygen the has been set digestion process groove of certain temperature, add therein active sludge, stir a few days to tens of days the time, make its delay, thus, make this active sludge be decomposed into the method for nitrated gas, supernatant liquor, digested sludge.By this digestion process, can cut down the amount of active sludge.Need to prove, in the digestion process operation 460, can suitably use other digestion process method.
And the above-mentioned active sludge that digestion process is crossed uses the solid-liquid separating methods such as centrifugation, filtration, precipitation to be solid matter and supernatant liquor by solid-liquid separation in the second solid-liquid separation process 470.Owing to comprise a large amount of ammonia-state nitrogens in this supernatant liquor, by it being transferred to sky aeration operation 140, can be in empty aeration operation 140 effectively with this ammonia-state nitrogen nitrated be nitrite nitrogen, nitric nitrogen.
Fig. 5 represents to comprise the treatment process of the organic drainage of mix and blend operation 110, aeration operation 120, solid-liquid separation process (the first solid-liquid separation process) 130, digestion process operation 460, the second solid-liquid separation process 470 and nitrated operation 580.In the present embodiment, sky aeration operation 140 is set unlike the treatment process of Fig. 1 to Fig. 4, but will be transferred to nitrated operation 580 by the supernatant liquor that digestion process operation 460 and the second solid-liquid separation process 470 obtain.Then, in nitrated operation 580, make ammonia-state nitrogen contained in this supernatant liquor nitrated state or nitric nitrogen for nitrite nitrogen and nitric nitrogen coexistence, and they are transferred to mix and blend operation 110.In the mix and blend operation 110, the active sludge that has in the mix and blend groove is processed organism contained in the organic drainage with bonded oxygen contained in above-mentioned nitrite nitrogen or the nitric nitrogen.Therefore, with sky aeration operation 140 is set that the situation of the empty aeration of active sludge is same, can suppress the propagation of active sludge in the mix and blend operation 110.Need to prove, among the figure, for the operation with function identical with Fig. 1 to Fig. 4, give prosign and description thereof is omitted.
Fig. 6 represents to comprise the treatment process of the organic drainage of mix and blend operation 110, aeration operation 120, solid-liquid separation process 130, empty aeration operation 140 and biological culture operation 690.Among the figure, for the operation with function identical with Fig. 1 to Fig. 5, give prosign and description thereof is omitted.
In the biological culture operation 690, use the biological culture groove that for example possesses the biological culture material to carry out biological culture and process.Particularly, part or all of active sludge that will carry out empty aeration in empty aeration operation 140 is transferred to the biological culture groove, and it is contacted with the biological culture material, makes the organic substance decomposing functional activation of microorganism contained in the active sludge.More specifically, for example, use biological culture groove 700 shown in Figure 7, carry out biological culture and process.This biological culture groove 700 is provided with the rotor 706 for generation of up stream U and downstream D that flows into oral area 702, outflow oral area 704, is positioned at its substantial middle section, the pressure plate 714 that makes the force enhancing of above-mentioned up stream U and downstream D.And, in empty aeration operation 140, carried out empty aeration active sludge part or all and be not that the water of organic drainage is imported in the biological culture groove 700 from flowing into oral area 702.Here, adopt following structure, namely, rotor 706 uses the dynamic rotation of engine M708, rotor 706 inboard produce in the biological culture groove 700 the bottom towards the up stream U on top and on the top of rotor 706 outsides generation in the biological culture groove 700 the downstream D towards the bottom.
And, utilize such structure, even also can easily produce up stream U and downstream D in the situation that the solids component of the contained active sludge of this mixed solution was many when the above-mentioned active sludge in will importing biological culture groove 700 and water mixed.Thus, the mixed solution in the biological culture groove 700 is detained, and keeps even and aerobic state in the biological culture groove 700 always, and therefore, the microorganism that contains in the above-mentioned mixed solution is activated.And then, in this downstream D, be provided with biological culture material 710.Biological culture material 710 is filled in the biological culture material holding device 712 that for example has the mesh structure, by microorganism contained in the above-mentioned active sludge is suitably contacted with biological culture material 710, this microbic activity can be improved, the odorless modification of mixed solution can be carried out simultaneously.
As the biological culture material 710 that uses in the biological culture operation 690, preferred vegetable mould, andosols (kuroboku soil), volcanic ash soil (Andosol), iron(ic) chloride, silicate, float stone etc., for example more preferably making, the saccharoid of the particle diameter about 15mm～50mm uses.By using such biological culture material 710, can decompose or adsorb the repugnant substances such as mercaptan, thioether, ketone, improve foul smell and the dehydration property of the contained active sludge of mixed solution.And then the mixed solution that has carried out processing in biological culture groove 700 is discharged from by flowing out oral area 704, is back to sky aeration operation 140.
[embodiment]
Below, with reference to Fig. 8 and Fig. 9 one embodiment of the invention are elaborated.
Fig. 8 represents that diagrammatically the organic drainage treatment system is whole, uses pretreatment tank 800, mix and blend groove 810, aerator tank 820, solid-liquid separation tank 830, thickener 840, empty aerator tank 850 to process organic drainage.
At first, will be from the organic drainage of each family or factory's discharge be fetched water pretreatment tank 800.In pretreatment tank 800, be provided with filter screen 801 and settling bath 802.Contained solids component uses filter screen 801 to filter and remove in the organic drainage of fetching water.Then, the organic drainage after filtering is injected settling bath 802, leave standstill a few hours, thus, make solid matter residual in the organic drainage settlement separate (S900 of Fig. 9).The organic drainage that has carried out solid-liquid separation in the settling bath 802 is transferred to mix and blend groove 810.
In mix and blend groove 810, possess in advance active sludge, be provided with whipping appts 811 that the organic drainage transferred from pretreatment tank 800 and this active sludge are stirred and mix and blend groove 810 be divided into the one the second partition 815 and the two or three partitions 816 of 3 cells (the 1st groove 812, the 2nd groove 813, and the 3rd groove 814).The organic drainage of transferring from pretreatment tank 800 is from the edge side water filling of the mix and blend groove 810 relative with the one the second partitions 815 of the 1st groove 812.In the mix and blend groove 810, use whipping appts 811, with contact with air ground organic drainage and the active sludge that injects mix and blend groove 810 do not carried out mechanically mix and blend.Thus, make in the mixed solution of above-mentioned organic drainage and active sludge and do not comprise dissolved oxygen (S902 of Fig. 9).Carry out the organic drainage of mix and blend gained and the mixed solution of active sludge is transferred to aerator tank 820 by mix and blend groove 810.
Be provided with in aerator tank 820 that mixed solution to the organic drainage that is transferred to aerator tank 820 and active sludge carries out the first air-diffuser 821 of oxygen aeration and to the first gas blower 822 of these the first air-diffuser 821 delivering oxygens.The contained active sludge of above-mentioned mixed solution of transferring from mix and blend groove 810 uses the aeration by the first air-diffuser 821 to be dissolved in dissolved oxygen the mixed solution, processes organism contained in the organic drainage, does not namely have contained dirty materials such as ammonia-state nitrogen in the part, organic drainage of the tensio-active agent that active sludge can not be processed in the mix and blend groove 810 of dissolved oxygen.Need to prove, the residence time of above-mentioned mixed solution in aerator tank 820, and suitably determine (S904 of Fig. 9) by the amount of the oxygen of the first air-diffuser 821 aerations etc. by the character of organic drainage and the character of active sludge.The above-mentioned mixed solution that carries out aeration by aerator tank 820 is transferred to solid-liquid separation tank 830.
In solid-liquid separation tank 830, be provided with the pump 831 be used to the active sludge of extracting settlement separate gained out.Be transferred to the above-mentioned mixed solution of solid-liquid separation tank 830 by in solid-liquid separation tank 830, leaving standstill a few hours to tens of hours, be separated into fallout (active sludge) and supernatant liquor (processing water) (S906 of Fig. 9).Thickener 840 is extracted and be transferred to fallout out by pump 831.Supernatant liquor is banished public waters or is recycled (S908 of Fig. 9) as miscellaneous waters such as process waters after chlorine etc. carries out disinfection.
In thickener 840, be provided with the thickened sludge extractor pump 841 as the pump of extracting concentrated active sludge out.Be transferred to the above-mentioned active sludge of thickener 840 by in thickener 840, leaving standstill a few hours to tens of hours, further be separated into concentrated active sludge and supernatant liquor (S910 of Fig. 9).Concentrated active sludge uses thickened sludge extractor pump 841 to extract out, is transferred to sky aerator tank 850.
In empty aerator tank 850, be provided with the active sludge that is transferred to sky aerator tank 850 from thickener 840 is carried out the second air-diffuser 851 of oxygen aeration and to the second gas blower 852 of these the second air-diffuser 851 delivering oxygens.By concentrated active sludge being added into the sky aerator tank 850 apart from mix and blend groove 810 edge farthest from empty aerator tank 850 of thickener 840.The active sludge (S912 of Fig. 9) after not carrying out aeration contiguously with organic drainage that is transferred to this sky aerator tank 850 is sent back to mix and blend groove 810.In empty aerator tank 850, a part of autoxidation of the active sludge that empty aeration is crossed is decomposed, and the nitrogen component of stripping this moment is nitrated via ammonia-state nitrogen to be state or the nitric nitrogen of nitrite nitrogen and nitric nitrogen coexistence.The residence time of the active sludge in the empty aerator tank 850, and aeration intensity according to the character of the character of organic drainage and active sludge and difference is adjusted less than the mode of 0.5mg/L with ammonia-state nitrogen contained in the active sludge that is sent back to mix and blend groove 810.Need to prove, be transferred to microorganism contained in the active sludge of sky aerator tank 850 and mainly comprise polyose and protein, for example form and use C
5H
7NO
2Expression.This microorganism is take weight ratio about 12% as nitrogen, therefore, by send ammonia-state nitrogen contained the active sludge of mix and blend groove 810, nitrite nitrogen, and the amount of nitric nitrogen back to from empty aerator tank 850, can calculate the amount roughly that autoxidation is decomposed the active sludge of (reduction) in empty aerator tank 850.
The above-mentioned active sludge that has carried out empty aeration is sent back to mix and blend groove 810 from the edge side of the mix and blend groove 810 relative with the one the second partitions 815 of the 1st groove 812.Thus, send back in the 1st groove 812 of this active sludge and become the state that has energetically nitrite nitrogen or nitric nitrogen.Need to prove that organic drainage and the above-mentioned active sludge that is sent back to be not to be loaded in the mix and blend groove 810 with the mode of contact with air.
As mentioned above, in mix and blend groove 810, do not carry out aeration, and then do not stir with the mode of contact with air with organic drainage and active sludge yet.Therefore, become the state that does not have dissolved oxygen in the mixed solution of organic drainage in mix and blend groove 810 and active sludge.On the other hand, as mentioned above, at the 1st groove 812 interior nitrite nitrogen or the nitric nitrogens of existing, therefore, contained active sludge was stated in the use bonded oxygen contained in nitrite nitrogen or the nitric nitrogen and is decomposed the contained organic while in the organic drainage during the 1st groove 812 was interior, carried out denitrogenation.Here, this active sludge comes decomposing organic matter with above-mentioned bonded oxygen.Therefore, compare with come the situation of decomposing organic matter with dissolved oxygen, the cell turnover ratio (mud turnover ratio) that organism is being shot when getting in the active sludge (microorganism) can be suppressed at low-levelly, can suppress the proliferative amount of active sludge.Need to prove, the capacity of mix and blend groove 810, and the residence time of organic drainage, active sludge suitably determined by the character of organic drainage and the character of active sludge.
In the 1st groove 812, because organic decomposition, active sludge consumes above-mentioned bonded oxygen.Thus, become in the mixed solution of the active sludge that is transferred to the 2nd groove 813 and organic drainage the state that inspection does not measure above-mentioned bonded oxygen.Therefore, become anaerobic state in the 2nd groove 813 and the 3rd groove 814.Here, this anaerobic state preferably was made as more than 4 hours.Then, this mixed solution is transferred to aerator tank 820.
In aerator tank 820, the contained dirty materials such as ammonia-state nitrogen are processed in the tensio-active agent that can not process active sludge in the mix and blend groove 810 that does not have as mentioned above dissolved oxygen, the organic drainage.In aerator tank 820, mainly be that nitrobacteria (group) contained in the active sludge is decomposed above-mentioned dirty material.The proliferation rate of this nitrobacteria (group) is low, can suppress the propagation of aerator tank 820 interior active sludge.
Need to prove, in above-mentioned embodiment and embodiment, be provided with sky aerator tank, mix and blend groove and aerator tank, still, also can be by such as separating a groove with partition etc., thus sky aerator tank (section), mix and blend groove (section) and aerator tank (section) are set.
Utilizability on the industry
In sum, utilize treatment process and the organic drainage treatment system of organic drainage of the present invention, compare with the treatment process of the organic drainage that utilizes aeration to carry out, can significantly suppress this and process needed energy, simultaneously, can be except the generation of denitrification and inhibition active sludge.In addition, can also seek to reduce load to environment.
Claims (10)
1. the treatment process of an organic drainage is characterized in that, comprises following operation:
The mix and blend operation that organic drainage is mixed with active sludge and stirs;
The aeration operation of the organic drainage that this mix and blend is obtained and the mixed solution aeration of active sludge;
The mixed solution solid-liquid separation that this aeration is crossed is to process the solid-liquid separation process of water and active sludge;
Part or all of the active sludge that this solid-liquid separation is obtained do not carried out the empty aeration operation of aeration contiguously with above-mentioned organic drainage,
Wherein, will send back in the above-mentioned mix and blend operation by the active sludge that this sky aeration operation is carried out aeration and carry out mix and blend.
2. the treatment process of organic drainage according to claim 1, it is characterized in that, in described empty aeration operation, make part or all self-digestion of active sludge, make the nitrogen component that produces by this self-digestion via ammonia-state nitrogen nitrated state or nitric nitrogen for nitrite nitrogen and nitric nitrogen coexistence.
3. the treatment process of organic drainage according to claim 1 and 2 is characterized in that, ammonia-state nitrogen contained in the described active sludge that is sent back in the mix and blend operation is less than 20mg/L.
4. the treatment process of each described organic drainage in 3 according to claim 1, it is characterized in that, in described mix and blend operation, active sludge uses in bonded oxygen contained in the state that produce in described empty aeration operation, the coexistence of nitrite nitrogen and nitric nitrogen or the nitric nitrogen contained bonded oxygen to process organic drainage.
5. the treatment process of each described organic drainage in 4 according to claim 1, it is characterized in that, after contained bonded oxygen is consumed by described active sludge in contained bonded oxygen or the nitric nitrogen in the state of the contained nitrite nitrogen of the mixed solution of mixed stirring and nitric nitrogen coexistence in described mix and blend operation, keep the anaerobic state of certain hour.
6. the treatment process of each described organic drainage in 5 according to claim 1, it is characterized in that, after contained bonded oxygen is consumed by described active sludge in contained bonded oxygen or the nitric nitrogen in the state of the contained nitrite nitrogen of the mixed solution of mixed stirring and nitric nitrogen coexistence in described mix and blend operation, keep anaerobic state more than 4 hours.
7. the treatment process of each described organic drainage in 6 according to claim 1, it is characterized in that, the treatment process of described organic drainage further comprises and will carry out the enrichment process that contained moisture is removed in part or all of active sludge of solid-liquid separation gained by described solid-liquid separation process, and, this has been removed active sludge aeration in described empty aeration operation of moisture.
8. the treatment process of each described organic drainage in 7 according to claim 1, it is characterized in that, the treatment process of described organic drainage further comprise the active sludge that carries out the solid-liquid separation gained by described solid-liquid separation process part or all carry out the digestion process operation of digestion process, and the supernatant liquor that the active sludge solid liquid that this digestion process is crossed is separating obtained carries out aeration in described empty aeration operation.
9. the treatment process of an organic drainage is characterized in that, comprises following operation:
The mix and blend operation that organic drainage and active sludge are mixed and stir;
Aeration operation with the mixed solution aeration of the organic drainage of this mix and blend gained and active sludge;
The mixed solution solid-liquid separation that this aeration is crossed is to process the solid-liquid separation process of water and active sludge;
Part or all of the active sludge of this solid-liquid separation gained carried out the digestion process operation of digestion process;
Contained ammonia-state nitrogen is nitrated in the supernatant liquor that the active sludge solid liquid that this digestion process is crossed is separating obtained is nitrite nitrogen and the state of nitric nitrogen coexistence or the nitrated operation of nitric nitrogen,
And, send the supernatant liquor of this nitrated mistake back to described mix and blend operation and carry out mix and blend.
10. an organic drainage treatment system is characterized in that, possesses with lower device:
With organic drainage water intaking and pretreatment unit that solid matter contained in this organic drainage is removed;
The mixed stirring device that the described organic drainage that will send out from this pretreatment unit and active sludge mix and stir;
The aerating apparatus of the described organic drainage that will send out from this mixed stirring device and the mixed solution aeration of active sludge;
The described mixed solution solid-liquid separation that to send out from this aerating apparatus is to process the equipment for separating liquid from solid of water and active sludge;
The concentrating unit that contained moisture is removed part or all of the described active sludge that will send out from this equipment for separating liquid from solid;
Make the described active sludge of having removed moisture of sending out from this concentrating unit not carry out contiguously aeration with described organic drainage, and send the empty aerating apparatus of described mixed stirring device back to.
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