CN102428043A - Method and apparatus for reducing sludge amount - Google Patents
Method and apparatus for reducing sludge amount Download PDFInfo
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- CN102428043A CN102428043A CN2009801593995A CN200980159399A CN102428043A CN 102428043 A CN102428043 A CN 102428043A CN 2009801593995 A CN2009801593995 A CN 2009801593995A CN 200980159399 A CN200980159399 A CN 200980159399A CN 102428043 A CN102428043 A CN 102428043A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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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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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
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- Treatment Of Sludge (AREA)
- Activated Sludge Processes (AREA)
Abstract
A method of reducing the amount of a sludge, wherein some of the sludge generated in an aeration tank is safely and efficiently converted to a substrate with hypochlorous acid and the substrate is returned to the aeration tank and digested. Dilute hydrochloric acid or dilute sulfuric acid is injected into some of a sludge withdrawn from a sedimentation tank (4), and the mixture is stirred to make the sludge weakly acidic. Subsequently, an aqueous sodium hypochlorite solution is injected into the sludge having a sludge concentration of 2,000-26,000 mg/L, in such an amount as to result in an effective chlorine concentration of 300-1,600 mg/L, and the mixture is stirred to convert the sludge into a substrate. According to need, an aqueous sodium sulfite solution or an aqueous sodium thiosulfate solution is injected into the substrate sludge, and the mixture is stirred. This mixture is returned to the aeration tank (3) and aerated to digest the sludge. Thus, the amount of a sludge is reduced.
Description
Technical field
The present invention relates to the cutting method of mud and the cutting device of mud, more particularly, the present invention relates to the cutting method of following mud and the cutting device of mud; Wherein, make in aerator tank and react, can carry out the matrix processing through the state of microbiological degradation to comprising a part of mud and the weakly acidic hypochlorous acid that produce when active sludge treatment is carried out in organic draining; Turn back to it in aerator tank once more; Carry out active sludge treatment, digested sludge, the generation of inhibition excess sludge.
Background technology
As comprising one of treatment process of organic draining, people know has activated sludge process.This activated sludge process is following method, wherein, as the past known; With the so-called organic sludge that swims of lives such as aerobic bacteria, protozoon, that is, active sludge remains in the aerator tank; Then; Send into enough air, and drop into and to comprise handled organic draining, make the organism that is contained in the draining inhabited the mikrobe predation of aerobic bacteria in the active sludge, protozoon etc.The water of in aerator tank, handling and the mixture flow of active sludge, separate into active sludge and supernatant, i.e. treating water here in settling bath.Treating water is discharged in public waters etc.Sedimentary active sludge turns back in the aerator tank as foldback mud.According to this method, because the organism in the draining is decomposed into water and dioxide gas, so have the advantage that acquisition comprises organic treating water hardly.
But because the mikrobe of aerobic bacteria etc. breeding in large quantities in aerator tank, so if place same as before, then active sludge excessively increases, in settling bath, active sludge can't separate with treating water.So, handle the remaining active sludge that produces through aeration and extract out termly as excess sludge from settling bath.For the excess sludge of extracting out, form water ratio through dewatering unit and be about 85% dehydration piece, then burn, discarded then.Or the piece that directly will dewater is imbedded and is buried underground in the ground.But, owing to, require a large amount of heavy oil in the occasion that the dehydration piece is burned, thus the cost cost, and, produce the methane gas of so-called greenhouse gases in the occasion of burying underground.In addition, also has the insufficient day by day problem in ground itself of burying underground.So, in the processing that comprises organic draining, require the reduction of mud consumingly.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2005-305222 communique
Patent documentation 2: TOHKEMY 2007-7546 communique
Patent documentation 3: No. 4183737 communique of japanese
In patent documentation 1, record the cutting method of following mud, wherein, from the mud of settling bath pump drainage, adding ozonize, give aerator tank with its foldback once more.If in mud, add ozone, the microbial cell wall that then produce to constitute mud destroys because of oxidation, and the tenuigenin of cell interior is separated out, or with the aggregate of mikrobe, that is, and and the dissolving of the so-called mud of agglomerate segmentation.Because this liquefiable mud is easily by the mikrobe of bacterium etc. predation, so if once more foldback to aerator tank to carry out active sludge treatment, then digested, can cut down mud.In addition, in patent documentation 1, beyond the deozonize, also record the hypochlorite of soda of further injection as oxygenant, i.e. Youxiaolin promotes the liquefiable method of mud.
Owing to also can mud be carried out dissolving processing, in aerator tank, carries out active sludge treatment once more, so affirmation can be cut down the effect of mud through the cutting method of the mud of record in patent documentation 1.But, also have problem.Such as, owing to, necessarily require a large amount of ozone, so large-scale especially ozonizer must be set for mud is carried out dissolving processing.In addition, also have, necessarily require many electric power, the problem that initial cost and operation cost all uprise in order to produce a large amount of ozone.
Be not auxiliary use, weakly acidic hypochlorous acid be injected in the mud mud to be carried out the matrix Treatment Technology also be known as ozone, such as, in patent documentation 2, propose to have this technology.In addition, mud is handled, be in the state this point that can in aerator tank, digest and generally explain through liquefiable term.But, judge according to the inventor's research, if make sludge reaction,, still become the composition that can in aerator tank, digest even then be not under the situation of so-called liquefiable state at mud through hypochlorous acid.So, replace the term of " can dissolve ", in this manual, through term statement as " matrixization " of the statement that meets actual form more.In addition, about the appearanceization that subtracts of mud, be expressed as " reduction of mud " as tighter statement.
The occasion of the method for record in implementing patent documentation 2 is that small-sized so initial cost is low, the price of chemical reagent is also low and simple owing to inject weakly acidic hypochlorous equipment, and operation cost is also little, is favourable thus.But, in patent documentation 2, in the method for record, also have following shortcoming; That is, the relative mud of hypochlorous effective chlorine density that is injected is in the scope of 150～250mg/L; Concentration is not high, and the matrix processing of mud is insufficient, and mud can't be cut down fully.If mud is carried out the matrix processing fully; Merely inject the hypochlorous acid of high density; Can exist hypochlorous acid directly to turn back to the possibility in the aerator tank,, then the mikrobe of aerator tank caused to seriously influence if like this at unreacted state; Thus, it is believed that and to inject high concentration hypochlorous acid.In patent documentation 3, record following matrix makeup and put, wherein, the reactive tank of placed in-line a plurality of grooves is set, in such reactive tank, consume hypochlorous acid fully, can prevent influence really to the mikrobe of aerator tank.Because the matrix makeup through such is put, safety is guaranteed, so can inject the hypochlorous acid of high density, mud is carried out the matrix processing.That is, in patent documentation 3 in the matrix method of record, in the groove at the upper reaches of reactive tank, be that the high density mode of 100～3000mg/L is injected in the mud according to effective chlorine density with weakly acidic hypochlorous acid, stir.Then, deliver in the groove in downstream side and stir, further deliver in the groove in downstream side more and stir, reaction is more than 5 minutes.If handle like this, then can carry out the matrix processing to mud fully, hypochlorous acid also consumes fully.So, can cut down mud safely.In addition, it is believed that in the past that residual hypochlorous acid is returned to it that this point is dangerous in aerator tank, but confirms through experiment, if implement this method, even then be returned under the situation in the aerator tank at the hypochlorous acid with some amounts, does not still impact.Its reason possibly be by inference because: if react more than 5 minutes, then consume the high free chlorine of sterilizing power reliably, the hypochlorous acid of foldback is in the state of combined chloride, or is in and state that the mud bonded is in the past unknown, and sterilizing power reduces fully.
Summary of the invention
According to the cutting method of the mud of record in the patent documentation 3,,, can cut down fully so can carry out the matrix processing to mud fully owing to weakly acidic hypochlorous acid is injected in the mud according to the mode that forms high density.In addition, because hypochlorous acid and mud reacts fully, so the mikrobe of aerator tank is not caused disadvantageous effect.So, can be referred to as the cutting method of good mud.But it is also believed that should improved aspect, and specifically, weakly acidic hypochlorous modulator approach or method for implanting have should improved aspect.
In the cutting method of the mud of in patent documentation 3, putting down in writing; Weakly acidic hypochlorous acid is through the following manner modulation; This mode is: the hypochlorite of soda aqueous solution below 12% and Hydrogen chloride are mixed, dilute through water in the mode of 500～15000mg/L according to effective chlorine density.If form like this, then obtain pH at the weakly acidic hypochloric acid water solution more than 4.0, in the scope of less than 7.0.In fact, if effective chlorine density increases, even then under pH is about 6.5 situation, the smell of chlorine is grow also, must take taste removal, exhaust countermeasure.In addition, also have reactivity and uprise, the problem of the seriously corroded of the parts of the pipe of the setting device of the adjustment aqueous solution etc.The easy to handle effective chlorine density is preferably in the aqueous solution below the 5000mg/L in the formation practical application below 10000mg/L.If so weakly acidic hypochloric acid water solution is injected in the mud in large quantities, then hypochlorous acid is diluted because of mud, and concentration reduces, and oxidizing power dies down.In addition, owing to require the necessary water of modulation of a large amount of aqueous solution, so cost is high.In addition, because foldback increases for the total amount of the mud of aerator tank, so can be to the aerator tank applying load.In the occasion that the mud that sludge concentration is surpassed the higher concentration of 20000mg/L is handled, it is obvious that such problem becomes.Also have anticipation and dilute, modulate the method for the hypochloric acid water solution that the pH value is low and concentration is high in advance through mud.But,, then produce the problem of above-mentioned that kind if hypochlorous effective chlorine density increases; In addition, if effective chlorine density is more than 5000mg/L, then as above-mentioned; Oxidizing power increases, and the preparation facilities of the modulation aqueous solution, injection device, pipeline etc. in early days can variation.In addition, if pH, then has the serious security problem that generates deleterious chlorine below 4.0.So it is unpractical adopting such method.
Another important problem is the danger and the economy of device.Effective chlorine density surpasses the complex structure of modulator of the weakly acidic hypochloric acid water solution of 1000mg/L, in addition, the subsidiary facility of auxiliary tank etc. must be set, or the condition of adjustment modulator periphery.In such modulator, keep the management expectancy hi-tech, then be attended by idle in the danger of keeping management, leaving to turn round.Particularly, if effective chlorine density surpasses 5000mg/L,, must carry out parts inspection and replacing continually then in order to keep safety.Not only initial cost is high, and keeps management and also spend many expenses.
The present invention be directed to above-mentioned such problem and propose, specifically, the objective of the invention is to a kind of cutting method and cutting device of mud; Wherein, do not require a large amount of water, the load of aerator tank does not increase yet; Do not take the danger of special taste removal, exhaust measure or equipment, pipeline variation yet, can under the pH of the best condition, make the hypochlorous acid and the sludge reaction of high effective chlorine density, so; Can carry out the matrix processing to mud fully, cut down mud, in addition; The modulator of the hypochloric acid water solution of the danger with plant failure generation needn't be set especially, so, the desired initial cost of equipment can be cut down; Keep management easily, say that synthetically cost can be cut down significantly.
Be used to solve the technical scheme of problem
To achieve these goals, in the present invention, when mud is carried out the matrix processing, in mud, inject Hydrogen chloride or dilute sulphuric acid, stir or mix.Then, in the mud in the scope of sludge concentration, inject aqueous sodium hypochlorite solution in the mode of 300～1600mg/L according to effective chlorine density at 2000～26000mg/L.Perhaps, in mud, inject aqueous sodium hypochlorite solution according to the mode of the effective chlorine density of 3～20% the value that forms sludge concentration.Then, according to stirring more than 5 minutes, the mode of mud being carried out the matrix processing constitutes.In addition; According to as required; In mud, inject sodium sulfite aqueous solution, or sodium thiosulfate solution stirs, its mode that turns back to aerator tank is constituted through the matrix processing; Mud to turning back to the process matrix processing in the aerator tank carries out active sludge treatment, digests.That is, cut down mud.In addition; The cutting device of such mud is made up of the sour mixing head of specified length or the sour tempering tank and the stirred tank of specified volume; In this acid mixing head or sour tempering tank, inject Hydrogen chloride or dilute sulphuric acid; This stirred tank is arranged at the downstream of this pipe or groove, and aqueous sodium hypochlorite solution is injected in the mud, and whipping appts is set in stirred tank.In addition, as required, the residual chlorine decomposer is set, in mud, injects sodium sulfite aqueous solution or sodium thiosulfate solution in the downstream of stirred tank.In addition, pH meter is set in stirred tank, whether sour mixing head or sour tempering tank and stirred tank are normally kept watch on.
That is, to achieve these goals, the described invention of claim 1 is a kind of cutting method of mud; In the method, in aerator tank,, extract a part of mud out to comprising in the mud that produces when active sludge treatment is carried out in organic draining; Through hypochlorous acid it is carried out the matrix processing, the mud that will pass through the matrix processing turns back in the aerator tank, digests through active sludge treatment; Cut down mud, this method constitutes according to this mode, and this mode is: when above-mentioned a part of mud is carried out the matrix processing; In above-mentioned a part of mud, inject dilute sulphuric acid or dilute sulphuric acid, stir or mix, then inject aqueous sodium hypochlorite solution; Stir more than 5 minutes, mud is carried out the matrix processing.
The described invention of claim 2 relates to the described method of claim 1, and it constitutes in the following manner, and this mode is: the mode of pH value in 3.5～6.5 scope when above-mentioned Hydrogen chloride or dilute sulphuric acid carry out the matrix processing to above-mentioned a part of mud injected.
The described invention of claim 3 relates to claim 1 or 2 described methods; It constitutes in the following manner, and this mode is: above-mentioned aqueous sodium hypochlorite solution is that the mode in the scope of 300～1600mg/L is injected in the mud of sludge concentration 2000～26000mg/L according to effective chlorine density.
The described invention of claim 4 relates to the cutting method of claim 1 or 2 described mud, and it constitutes in the following manner, and this mode is: above-mentioned aqueous sodium hypochlorite solution injects according to the mode of the effective chlorine density of 3～20% value of sludge concentration.
The described invention of claim 5 relates to the cutting method of any one the described mud in the claim 1～4; It constitutes in the following manner; This mode is: in the mud of above-mentioned process matrix processing, inject sodium sulfite aqueous solution or sodium thiosulfate solution; It is stirred, it is turned back in the aerator tank.
The described invention of claim 6 relates to a kind of cutting device of mud; It is arranged in the treatment facility that comprises organic draining, and this equipment is made up of aerator tank and settling bath, and this aerator tank carries out active sludge treatment to comprising organic draining; The water sepn that this settling bath will be included in the mud of handling in the above-mentioned aerator tank is supernatant and mud; The cutting device of this mud constitutes in the following manner, and this mode is: the cutting device of above-mentioned mud is made up of the sour mixing head of specified length or the sour tempering tank and the stirred tank of specified volume, in this acid mixing head or sour tempering tank; Discharge isolating a part of mud in above-mentioned settling bath; Inject Hydrogen chloride or dilute sulphuric acid, mix, this stirred tank is arranged at the downstream of above-mentioned sour mixing head or above-mentioned sour tempering tank, and aqueous sodium hypochlorite solution is injected in the mud; The whipping appts of regulation is set in above-mentioned stirred tank, and the mud that is injected with above-mentioned aqueous sodium hypochlorite solution stirred more than 5 minutes, and foldback is given above-mentioned aerator tank.
The described invention of claim 7 relates to the cutting device of the described mud of claim 6; It constitutes in the following manner; This mode is: in the downstream of above-mentioned stirred tank the residual chlorine decomposer is set; Inject sodium sulfite aqueous solution or sodium thiosulfate solution in the mud in above-mentioned residual chlorine decomposer, give above-mentioned aerator tank its foldback.
The described invention of claim 8 relates to the cutting device of claim 6 or 7 described mud; It constitutes in the following manner; This mode is: in above-mentioned stirred tank, pH meter is set, keeps watch on the Hydrogen chloride that in above-mentioned sour mixing head or above-mentioned sour tempering tank, injects or the IR of dilute sulphuric acid according to the mode of pH value in 3.5～6.5 scopes of the mud of above-mentioned stirred tank.
The described invention of claim 9 relates to the cutting device of any described mud in the claim 6～8, and it constitutes in the following manner, and this mode is: above-mentioned stirred tank is made up of placed in-line two a plurality of grooves more than the groove.
As above-mentioned; The present invention constitutes in the following manner; This mode is: be in the aerator tank to carry out extracting a part of mud out in the mud that active sludge treatment produces to comprising organic draining, when it is carried out the matrix processing, in mud, inject Hydrogen chloride or dilute sulphuric acid; Stir or mix, then inject aqueous sodium hypochlorite solution.That is, constitute, thus, do not inject the situation of the machine or the pipeline degradation of usefulness, also do not adopt a large amount of water to accomplish according to the mode of directly injecting Hydrogen chloride or dilute sulphuric acid, aqueous sodium hypochlorite solution respectively.In addition, even mud is being turned back under the situation of aerator tank, still can the load of aerator tank be suppressed at irreducible minimum.In addition, owing to constitute according to the mode of directly injecting Hydrogen chloride or dilute sulphuric acid, aqueous sodium hypochlorite solution respectively, so can reduce the pH value easily or improve hypochlorous effective chlorine density.In addition, since aqueous sodium hypochlorite solution be injected into be injected with Hydrogen chloride or dilute sulphuric acid and stir, in the mixed mud, so acquisition can not produce the distinctive effect of the present invention of chlorine.That is, if, inject Hydrogen chloride or dilute sulphuric acid in advance aqueous sodium hypochlorite solution being injected after mud stirs; Because the pH value moment ground of the part of injecting reduces, and has the danger that produces chlorine, but according to method of the present invention; When injecting aqueous sodium hypochlorite solution; Because mud forms uniform pH value, thus extremely low pH value can not produced, so can not produce chlorine.Therefore be safe.Like this, can reduce the pH value of mud safely or improve hypochlorous effective chlorine density, in addition, owing to constitute according to the mode that stirs with the degree more than 5 minutes, so can carry out the matrix processing to mud fully.So, digest if turn back to aerator tank, then can cut down mud fully.
In addition, according to the another one invention, because Hydrogen chloride or dilute sulphuric acid are to inject according to the mode of pH in 3.5～6.5 scope of reacted mud, so under the situation of after this injecting aqueous sodium hypochlorite solution, still produce the situation of chlorine even can prevent really.In addition; Accordinging in sludge concentration is in the mud of 2000～26000mg/L; The invention that aqueous sodium hypochlorite solution injects according to the mode of effective chlorine density in the scope of 300～1600mg/L; Or, then can make the hypochlorous acid and the sludge reaction of abundant amount according to the invention that aqueous sodium hypochlorite solution injects with the thinning ratio of the effective chlorine density of 3～20% value of sludge concentration, ensure mud is carried out matrix processing fully.In addition; Stir according to injection sodium sulfite aqueous solution or sodium thiosulfate solution in through the mud of matrix processing; It is turned back to the invention of aerator tank, because it is fully low to ensure that foldback is got back to the residual chlorine of mud of aerator tank, so the mikrobe in the aerator tank is not impacted.
In addition, according to sour mixing head or the sour tempering tank of specified volume and the invention that stirred tank constitutes of the cutting device of mud by specified length, because device constitutes simply, thus can provide fault few, the device that cost can reduce significantly.The sour tempering tank of the sour mixing head of this specified length or specified volume is extracted isolating a part of mud in settling bath out; Inject Hydrogen chloride or dilute sulphuric acid and mix; This stirred tank is arranged at the downstream of sour mixing head or sour tempering tank, and aqueous sodium hypochlorite solution is injected in the mud.
Description of drawings
Fig. 1 is the figure of the treatment unit of the organic drainage of representing form of implementation of the present invention in a schematic way; Fig. 1 (a) has the side-view of treatment facility of the organic drainage of the mud cutting device of this form of implementation for expression in a schematic way, and Fig. 1 (b) is for represent the side-view of the mud cutting device of this form of implementation in a schematic way;
Fig. 2 is the side-view of the mud cutting device of the 2nd form of representing this enforcement in a schematic way.
Embodiment
Describe in the face of form of implementation of the present invention down.The treatment facility 1 that comprises organic draining in this form of implementation; That kind shown in the image pattern 1 (a); Constitute by the mud cutting device 6 of flow adjustment groove 2, aerator tank 3, settling bath 4, this form of implementation etc., in this flow adjustment groove 2, flow into and comprise organic draining and adjustment flow; In aerator tank 3, carry out active sludge treatment to comprising organic draining; In settling bath 4, comprise mud inflow through the treating water of active sludge treatment, it is separated into the treating water and the mud of supernatant; The mud cutting device 6 of this form of implementation is connected with regulation pipeline in being arranged at settling bath 4, and a part of mud of from settling bath 4, discharging is carried out the matrix processing.
Flow adjustment groove 2 is a kind of groove that cushions usefulness, from draining supply-pipe 8 supply with comprise organic draining be according to the rules the time be stranded in the flow adjustment groove 2, carry out homogenizing, control according to the flow that is fit to, give aerator tank 3.Also there is the situation by known former puddle (pit) formation in past in such flow adjustment groove 2.In aerator tank 3, as the past known, offer a plurality of air jet holes in its bottom.From being arranged at outside hair-dryer forced air is supplied to these airports.In addition, also in the inside of aerator tank 3, agitating vane is set as required.At the outlet end of the aerator tank 3 that constitutes like this, connect settling bath 4.Cultivate the mikrobe that aerobic bacteria etc. is arranged in the inside of aerator tank 3.
In this form of implementation, settling bath 4 constitutes the settling bath of sludge settling through gravity, is funnel-form on the whole, in its bottom, connects the mud pump drainage pipe 5 of extracting precipitating sludge out.This mud pump drainage pipe 5 turns back to aerator tank via foldback sludge pump 10 with mud.
That kind shown in mud cutting device 6 image patterns 1 (b) of form of implementation of the present invention is made up of placed in-line a plurality of grooves.Getting into the mud scale tank 11 through sludge pump 9 of the foldback sludge pipe 12 that is connected with settling bath 4 at first midway or from mud pump drainage pipe 5.Shown in Fig. 1 (b), it is not made up of the container that is the case shape the concrete structure of mud scale tank 11.A plurality of division plates of the breach of the inside of this container through offering regulation are divided into a plurality of chambers, in the division plate in downstream side, form V-notch weir.In addition, will supply to the chamber of upstream side from the precipitating sludge that settling bath 4 is extracted out.In the chamber of this upstream side, the door that slides along the vertical direction is set, this height location is according to adjusting for the mode of setting height.From this and the precipitating sludge of overflow meets at mud foldback pipe 12, turn back in the aerator tank 3.The mud of discharging from V-notch weir in addition, is given mud cutting device 6 through mud supply-pipe 13.Mud cutting device 6 is by the sour tempering tank 15 at the upper reaches that are connected with mud supply-pipe 13, towards downstream and the stirred tank rapidly 16 that connects successively, slow stirred tank 17, residual chlorine decomposer 18 constitute.In sour tempering tank 15, the Hydrogen chloride injection device that is made up of Hydrogen chloride holding vat 20 and Hydrogen chloride injection pump 21 is set, Hydrogen chloride is injected in the mud in the sour tempering tank 15.In addition, in the inside of sour tempering tank 15, the whipping appts 22 of the agitating vane with regulation is set.This Hydrogen chloride injection pump 21 and whipping appts 22 are connected with controlling board 24 through the SW of regulation, to detecting unusually of the various pumps of sludge pump 9 grades, whipping appts etc.
Stirred tank 16 and slow stirred tank 17 be for being injected with aqueous sodium hypochlorite solution rapidly, and mud is carried out the groove of matrixization, in this form of implementation, is made up of two grooves independently.Stirred tank rapidly 16 so also can be made up of single groove with slow steel basin 17, and slow stirred tank is made up of plural groove, even be made up of the groove that amounts to more than 3, still can likewise implement.In this form of implementation, stirred tank 16 is made up of the less groove of capacity rapidly, and slow stirred tank 17 is made up of jumbo groove.In such stirred tank rapidly 16, hypochlorous acid is set receives injection device, it is received holding vat 25 and hypochlorous acid by hypochlorous acid and receives injection pump 26 and constitute, and injects hypochlorous acid in the mud in groove and receives the aqueous solution.In addition, owing in the stirred tank 16 whipping appts 28 is being set rapidly,, give slow stirred tank 17 so receive the mud of the aqueous solution and stir apace, mix to being injected with hypochlorous acid.Equally also in slow stirred tank 17, whipping appts 29 is being set, when the mud of sending here from stirred tank 16 rapidly stirs slow stirred tank 17, is being detained more than 5 minutes, mud carry out matrixization fully.Near the relief outlet of slow stirred tank 17, pH meter 31 is set, will sends controlling board 24 to through the pH value that pH meter 31 is measured through the SW of stipulating.So, according to the mode of pH value in specialized range of in controlling board 24, measuring it is kept watch on automatically, detecting unusual occasion, device integral body is stopped or integral body stops the pump class.In addition, also can pass through the pH value, the IR of control Hydrogen chloride still, in this occasion, must be noted that pH meter is not used in the detection of unusual condition in sour tempering tank 15.In addition, hypochlorous acid is received injection pump 26, whipping appts 28,29 also through specified signal line and being connected with controlling board 24, detects the occasion that pump or whipping appts stop, stop gear at controlling board 24.In addition, best detecting unusual occasion, add and notify gerentocratic device from controlling board.
18 pairs of hypochlorous acid that residue in the mud of residual chlorine decomposer decompose, and adjust to not the groove of the concentration that the mikrobes in the aerator tank 3 are impacted.In residual chlorine decomposer 18, the S-WAT injector that is made up of S-WAT holding vat 32 and S-WAT injection pump 33 is set, the mud of sending here from slow stirred tank 17, inject sodium sulfite aqueous solution.In addition, as knowing,,, still the mikrobe of aerator tank 3 is not impacted even react under the situation of about 2～5 times amount of necessary amount injecting with residual hypochlorous acid for sodium sulfite aqueous solution through the experiment of embodiment 9.In addition, as knowing according to embodiment 10 and embodiment 11, even the IR of sodium sulfite aqueous solution is few, problem can not take place yet.So, inject be scheduled to a certain amount of for sodium sulfite aqueous solution.Whipping appts 34 is set in residual chlorine decomposer 18, mud is stirred.Such S-WAT injection pump 33 is connected with controlling board 24 with the SW of whipping appts 34 through regulation, detects abnormal signal.The pipeline of discharging from residual chlorine decomposer 18 is connected with mud foldback pipe 12, and the mud of in residual chlorine decomposer 18, handling turns back to aerator tank 3, handles through the aerobic mikrobe once more.
According to the treatment facility that comprises organic draining 1 of this form of implementation, mud cutting device 6 comprises controlling board 24, and the IR of sending mud amount, various chemical of sludge pump 9, the action of whipping appts etc. are kept watch on.So,, stop mud cutting device 6 in principle detecting certain unusual occasion.For what adopt that hypochlorous mud cutting device must pay attention to most is the unusual of running, a large amount of outflows that promptly produce chlorine and residual chlorine.In the treatment facility that comprises organic draining 1 of this form of implementation, in fact not because of the stopping of chemical injection pump, whipping appts stops etc. the possibility that causes producing chlorine unusually.Such as, can be through stopping affirmation security and its conditions such as experiment in the experiment of back illustrated example 3～5, the stirring of embodiment 6.But in order further to improve security, importantly in various devices, setting can detect unusual assembly, takes detecting when unusual, the Security Countermeasures that shut down etc.
For a large amount of outflows of residual chlorine, also must the following situation of supposition, according to circumstances promptly, loss, before the activation recovering, can not carry out draining for a long time and handle the situation that the running of factory stops at the active sludge of aerator tank 3.In this form of implementation, by each chemical injection pump employing pump of constant delivery type of label 22,28,29 expressions.For such pump of constant delivery type, price is low to be difficult for breaking down, even take place still can stop unusually, is difficult to produce the accident that chemical too much causes of injecting.In addition, as explaining, keeping watch on through controlling board 24 unusually of pump, whipping appts is stopped running, the possibility that does not have problems when unusual.
Also can pass through feedback control, implement the automatic control of the IR of control chemical rationally, be not only this method of passing through to inject a certain amount of chemical that adopts.Also can carry out such as, detect the pH value, control the IR of rational dilute sulphuric acid or according to the sludge stream value of measuring through the mud discharge meter, the processing of the dilute sulphuric acid that control is necessary, the IR of Youxiaolin etc.But, in the occasion of controlling automatically,, have the danger of the chemical that injects abnormal amount in the unusual occasion of surveying instrument generation of pH meter, under meter etc., in this occasion, cause the danger of mud cutting device to uprise.Must be noted that security.
Down the effect in the face of the treatment facility that comprises organic draining 1 of the mud cutting device 6 of form with this enforcement describes.Begin to describe from the state that gets into steady running.Flow in the flow adjustment groove 2 if comprise organic draining, then after the time is stranded in the flow adjustment groove 2 according to the rules, control, give aerator tank 3 according to the flow that is fit in draining.In aerator tank 3, as the past known, handle through active sludge.That is, spray because the air that blower is supplied with is air bubble-shaped, in the mikrobe of active sludge, the organism that is contained in the draining is preyed on by mikrobe with oxygen supply, is decomposed into water and carbonic acid gas.Owing to microorganism cells division is bred,, form new mud so the mikrobe that breeds forms agglomerate with undecomposed organism etc.The mud that produces is like this given next settling bath 4 with treating water.
At the influx of settling bath 4, inject flocculation agent as required.Cohesions such as agglomerate, difference and gravity separation through proportion are mud and treating water.Through such separation, obtain supernatant, i.e. treating water in the top position of settling bath 4.Because treating water comprises organism hardly, so can be discharged in the river.On the other hand, sedimentary mud is from the mud pump drainage pipe 5 of the bottom that is arranged at settling bath 4 and pump drainage turns back to aerator tank 3 through foldback sludge pump 10.In addition, its part is given mud scale tank 11 through sludge pump 9.In addition, give the groove of regulation as excess sludge termly, after dehydration, suitably transport to handling field etc. from the mud of mud pump drainage pipe 5 pump drainages.But, if cut down mud fully, so also have the situation of not discharging excess sludge through mud cutting device 6.
Because the door of mud scale tank 11 is adjusted to specified altitude, from V-notch weir, amount is discharged precipitating sludge according to the rules at every turn, gives mud cutting device 6 via mud supply-pipe 13.On the other hand, meet at mud foldback pipe 12, turn back to aerator tank 3 as foldback mud from the precipitating sludge of door overflow.Thus, suitably keep the organic concentration in the aerator tank 3, the activity of active sludge does not reduce.
The mud that transports from mud supply-pipe 13 supplies to sour tempering tank 15.In sour tempering tank 15, mud is injected normality, the Hydrogen chloride such as 8.5% with Hydrogen chloride injection pump 21.Stir, mix through 22 pairs of mud of whipping appts, the acidity of mud is adjusted in the scope of pH2.5～7.0, preferably adjust to the interior acidity of scope of pH3.5～6.5.In addition, measure the pH value of mud through being arranged at pH meter 31 in the slow stirred tank 17, still; Because in stirred tank 16 rapidly; If the injection aqueous sodium hypochlorite solution becomes near neutral, so measured pH value is higher than the pH value of the mud in the sour tempering tank 15.So, in controlling board 24, consider the variation of such pH value, set dangerous values, detect outlier.
The mud that in sour tempering tank 15, injects Hydrogen chloride is given stirred tank 16 rapidly.In stirred tank 16 rapidly, mud hypochlorous sodium injection pump 26 is injected normalitys, such as, 12% aqueous sodium hypochlorite solution.The example of this implantation concentration provides in embodiment 7, embodiment 8.The sludge concentration of the mud in the groove is in the scope such as 2000～26000mg/L, and the aqueous sodium hypochlorite solution that is injected, is preferably in the thinning ratio in the scope of 400～1200mg/L and injects in the scope of 300～1600mg/L according to effective chlorine density.Perhaps, in 3～20% the scope according to the value of sludge concentration, be preferably in 3～16% the scope, particularly be preferably in the thinning ratio of the effective chlorine density in 3～12% the scope and inject.In stirred tank 16 rapidly, mix through 22 pairs of mud of whipping appts, be detained about 1～5 minute.If like this, in adjusting to weakly acidic mud, inject aqueous sodium hypochlorite solution, mix, then as following formula, form hypochlorous acid.
HCl+NaOCl → HOCl+NaCl formula (1)
Perhaps also can consider that hypochlorite ion becomes hypochlorous acid under solutions of weak acidity as following formula.
H
++ OCl
-→ HOCl formula (2)
Because hypochlorous oxidizing power is strong, receive oxidation so constitute microbial cell film, a part of hard-decomposed organic of mud.That is, mud carry out matrixization.Know that in addition hypochlorous acid for the mode shown in the following formula is reacted, produces chlorine according to when being acid below the pH4.0.
HCl+HOCl → Cl
2+ H
2O formula (3)
But,,, still do not produce chlorine even under the acidic conditions below the pH4.0 as knowing according to the experiment of embodiment 3, embodiment 4 etc.Its reason is uncertain, and still, in comprising organic mud, the reaction that provides owing to following formula has precedence over the reaction shown in the following formula to be carried out, so infer and do not produce chlorine.
HOCl+ organism → oxidation of organic compounds+HCl formula (4)
The mud of in stirred tank 16 rapidly, handling is given slow stirred tank 17.
Method of the present invention and pass through are in the past directly injected the comparison of effect of method and the matrixization of hypochloric acid water solution, in embodiment 1 and embodiment 2, carry out.According to embodiment 1, there is not difference in the occasion of seeing according to the reacting weight of chlorine.Cut down in the experiment at the mud of embodiment 2, mud reduction rate of the present invention is high.The reason that the reduction rate is high is uncertain, but not poor at least.
In slow stirred tank 17, mud stirs more than 5 minutes through whipping appts 28, preferably is detained more than 30 minutes the time.If like this, then mud receives the matrix processing fully through hypochlorous acid.Detect the pH value through pH meter 31.In the occasion that is measured to unusual pH value, stop sludge pump 9, Hydrogen chloride injection pump 21, Youxiaolin injection pump 26, S-WAT injection pump 33 etc. Whipping appts 28,29,34 also can stir.If like this, even take place still aerator tank not to be impacted under the unusual situation at mud cutting device 6.
To in slow stirred tank 17, give residual chlorine decomposer 18 by the mud of abundant matrixization.In the mud of residual chlorine decomposer 18, inject S-WAT (Na
2SO
3) aqueous solution.If form like this, unreacted state and residual residual chlorine decomposes in mud then.After fully stirring, the mud of matrixization is turned back to aerator tank 3 through whipping appts 34.If in aerator tank 3, carry out active sludge treatment, then the mud of matrixization digests through the aerobic mikrobe.That is, can cut down mud.
The mud cutting device 6 of this form of implementation can have various distortion.Such as, sour tempering tank 15 also can be made up of the pipe of specified length.Fig. 2 representes to replace sour tempering tank 15 and mud cutting device 6 ' that the 2nd form of implementation of sour mixing head 36 is set.For device or the parts identical with constructional device, the structure unit of front form of implementation, mark identical label, do not carry out bright specifically.At the mud cutting device 6 of the 2nd form of implementation, in, because the length setting according to the rules of sour mixing head 36, so if Hydrogen chloride is injected in the mud then mixing in pipe easily at the upstream side of sour mixing head 36.If so sour mixing head 36 is made up of a plurality of curved tubes, then mix easily, the fast occasion of flow velocity of, mud big at caliber, Reynolds number increases, and forms turbulent flow, further promotes thus to mix.
In the mud cutting device 6 of this form of implementation, also has even without residual chlorine decomposer 18 still enforceable situation.That is, owing to the amount of the aqueous sodium hypochlorite solution that passes through to be injected, the hypochlorous acid that almost will residue in the mud consumes, so in such occasion, residual chlorine decomposer 18 is unwanted.In this form of implementation, also deformable of the chemical that is injected.Such as, in sour tempering tank 15 or sour mixing head 36, be illustrated according to the mode of injecting Hydrogen chloride, still,, can adjust the pH value of mud equally even be dilute sulphuric acid.Also can replace Hydrogen chloride, and adopt 35% sulfuric acid.In addition, according in residual chlorine decomposer 18, the mode of injecting sodium sulfite aqueous solution is illustrated, still, even be Sulfothiorine (Na
2S
2O
3) aqueous solution, still can the hypochlorous acid that residue in the mud be decomposed.
Respectively to being pre-mixed the aqueous solution that forms by Hydrogen chloride and aqueous sodium hypochlorite solution; Be that biological mother liquor (biomaster) is injected into the occasion in the mud; Inject the occasion of Hydrogen chloride and aqueous sodium hypochlorite solution respectively, all confirm the whether discrepant experiment of effect of the matrixization of mud.
Biological mother liquor is modulated in the following manner, and this mode is: 12% aqueous sodium hypochlorite solution of 8.5% Hydrogen chloride of specified amount and specified amount is mixed, and then, water dilutes, and the pH value is 6, effective chlorine density is 4000mg/L.
Amount is that the active sludge of 15300mg/L joins among 4 container A 1, A2, A3, the A4 with sludge concentration according to the rules.Then, in the mud of container A 1 and container A 2, effective chlorine density is respectively the biological mother liquor of the amount of 600mg/L and 1200mg/L when being infused in dilution, stirs 40 minutes.On the other hand, in the corresponding mud of container A 3 and container A 4, inject 8.5% Hydrogen chloride, its amount be injected into container A 1 and container A 2 in corresponding container in Hydrogen chloride identical.Then, in container A 3 and container A 4 corresponding mud, inject 12% aqueous sodium hypochlorite solution, its amount is identical with Youxiaolin in flowing into container A 1 and A2 respectively, stirs 40 minutes.
The indicator that employing is formed by potassiumiodide; Through sodium sulfite aqueous solution, the hypochlorous concentration in the corresponding container that residues in container A 1, A2, A3, A4 is carried out quantitatively the hypochlorous ratio of investigation and sludge reaction; It is reactivity; Reactivity is 91 ± 2% in container A 1 and container A 3, and in container A 2 and container A 4, reactivity is 79 ± 1%.
Can know the occasion of in mud, injecting biological mother liquor, with the occasion of injecting Hydrogen chloride and aqueous sodium hypochlorite solution respectively, reactivity does not have difference.The effect that can know the matrixization of mud does not have difference.
Embodiment 2
Respectively to the occasion of in mud, injecting biological mother liquor; Corresponding occasion with the occasion of injecting Hydrogen chloride and aqueous sodium hypochlorite solution respectively; Through the bulge test that the former water of taking from water drain is handled, the experiment whether effect of the reduction rate of enforcement investigation mud has difference.
Aerator tank * 1 of 3 grooves of outfit, * 2, * 3, add active sludge respectively with amount, add the former water of taking from water drain according to the mode that is respectively 180L.Be aerator tank * 1, * 2, * carry out in each groove of 3 stopping aeration after the aeration 21 hours, make sludge settling.After deposition, from aerator tank * 1, * 2, * 3 remove supernatant, that is, treating water not all only stays the mud of 50L in each groove.Extract the mud of 10L out from aerator tank * 2; Take among the container Y2; According to effective chlorine density is that the mode of 360mg/L is added on that synthetic effective chlorine density is the biological mother liquor of 4000mg/L among the embodiment 1, stirs 30 minutes, then; In S-WAT, decompose residual chlorine, it is turned back in aerator tank * 2.Extract the mud of 10L from aerator tank * 3 out, take among the container Y3, inject and the Hydrogen chloride that makes an addition to the biological mother liquor same amount of container Y2, stir, then, inject and the aqueous sodium hypochlorite solution that makes an addition to the biological mother liquor same amount of container Y2.After in container Y3, stirring 30 minutes, in S-WAT, decompose residual chlorine, it is turned back in aerator tank * 3.Special processing is not implemented in aerator tank * 1.
Such aerator tank * 1, * 2, * 3 in, add the former water from water drain, take respectively, reach 180L, carry out 30 minutes aeration, precipitate once more, only stay mud 50L respectively, discharge supernatant.Then, in aerator tank * 1, * 2, * drop into the former water of taking from water drain in 3, carry out 21 hours aeration.
Implement 3 weeks of such operation repeatedly, carry out adaptive debugging running, then, implemented repeatedly for 3 weeks again.Measurement in aerator tank * 1, * 2, * excess sludge that produces in each groove in 3, obtain aerator tank * 2, * the mud reduction rate of 3 relative aerator tank * 1, at this moment, be respectively 71%, 89%.Occasion in the aerator tank that injects Hydrogen chloride and aqueous sodium hypochlorite solution respectively * 3 is mixed Hydrogen chloride and aqueous sodium hypochlorite solution, and compares through aerator tank * 2 of injecting as biological mother liquor, and mud reduction rate is high.The reason that the reduction rate is high is unclear.But, if after mixing, inject aqueous sodium hypochlorite solution injecting Hydrogen chloride; Because at the lower state of the pH of mud value injection aqueous sodium hypochlorite solution, so according to the iso-electric point of mud, promptly near the pH value of pH2.5～3.0; Make the hypochlorous acid effect; If like this, consider also that then mud is neutral charge, the possibility that hypochlorous acid is more prone to react.Like this, the reason that the reduction rate is high is indefinite, still, belongs to the method that is not worse than the biological mother liquor of injection at least that is no better than really though inject the method for dilute sulphuric acid and aqueous sodium hypochlorite solution respectively.Also can be easily mud be adjusted near the pH value the iso-electric point, also can after adjustment like this, inject aqueous sodium hypochlorite solution, thus, be called good method.
Embodiment 3
In adjusting to tart mud, when injecting aqueous sodium hypochlorite solution, investigate the experiment that whether produces chlorine.
With sludge concentration is that the mud of 17100mg/L is taked in the 500mL beaker, when stirring through whipping appts, injects 8.5% the Hydrogen chloride of 0.9mL, and the pH value is 3.5.Then, according to the aqueous sodium hypochlorite solution of 1mL titration 12%, confirm whether to produce chlorine at every turn, also measure the pH value of this moment.Experimental result provides in table.
(table 1)
The chlorine of high concentration sludge produces experiment (SS 17100mg/L adds 500mL, beginning pH3.5)
| Titer, mL | 0 | 1 | 2 | 3 | 4 | 5 |
| pH | 3.5 | 4.4 | 5.3 | 6.2 | 7.0 | 7.8 |
| Produce chlorine | - | Do not have | Do not have | Do not have | Do not have | Do not have |
Shown in table 1 and know,, inject under the situation of aqueous sodium hypochlorite solution, still do not produce chlorine even in the mud of pH3.5.In addition, if make Hydrogen chloride and aqueous sodium hypochlorite solution reaction, then as formula (1), produce hypochlorous acid.Should reaction if consider, 8.5% of 0.9mL Hydrogen chloride relatively then, the equivalent of 12% aqueous sodium hypochlorite solution is 1.2mL.According to table 1, even under the situation of titration above the Youxiaolin of the 3mL of this 1.2mL, the pH of mud still is 6.2 slightly acidic.Even like this, surpass under the situation of equivalent injection aqueous sodium hypochlorite solution, the reason that the pH value still becomes alkaline side is that kind reaction shown in the image pattern (4), produces hydrochloric acid.Since the hydrochloric acid that generates once more with sodium hypochlorite reaction, so generation hypochlorous acid.Even like this, under the situation that hydrochloric acid consumes because of the reaction with Youxiaolin, if having the organic sludge that is reacted, it is generated by hypochlorous acid once more, and thus, the concentration of hydrochloric acid in the mud is stable, and mud is kept slightly acidic.
Embodiment 4
When in higher tart mud, injecting aqueous sodium hypochlorite solution, investigate the experiment that whether produces chlorine.
With sludge concentration is that the mud of 17100mg/L is taked in the 500mL beaker, when stirring through whipping appts, injects 8.5% the Hydrogen chloride of 3.4mL, and pH is 2.5.Then, according to the aqueous sodium hypochlorite solution of 1mL titration 12%, confirm whether to produce chlorine at every turn, also measure the pH value of this moment.Experimental result provides in table.
(table 2)
The chlorine of high concentration sludge produces experiment (SS 17100mg/L adds 500mL, beginning pH2.5)
| Titer, mL | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7.2 |
| pH | 2.5 | 2.8 | 2.9 | 3.2 | 3.6 | 4.2 | 5.0 | 5.8 |
| Produce chlorine | - | Do not have | Do not have | Do not have | Do not have | Do not have | Do not have | Do not have |
People know that pH is below 4.0, and particularly pH is in the occasion below 3.0, and hypochlorous acid becomes deleterious chlorine, it is believed that it is dangerous forming so stronger acid this point.But, through this experiment, even the situation of pH under the acidic conditions of 2.5～the last 4.0 confirms not produce chlorine.It is believed that its reason is that the occasion that becomes chlorine with hypochlorous acid compares, preferentially by the organic reaction consumes in the mud.
Occasion fully supplying with the mud of matrixization promptly, is comprising organic occasion fully, and when in the mud of pH2.5, injecting aqueous sodium hypochlorite solution, whether discussion has because of IR is different, and the possibility that causes chlorine to produce.Result according to table 2 can know, in the few occasion of the IR of aqueous sodium hypochlorite solution, does not have problems.Occasion to IR is many is inquired into.With the equivalent of the aqueous sodium hypochlorite solution of the Hydrogen chloride reaction of injecting be 5mL, even but such amount is being injected under the situation in the mud, pH still keeps 4.2 slightly acidic, does not produce chlorine.In addition, owing to aqueous sodium hypochlorite solution transports preservation for alkalescence,, produce the situation of chlorine so, the pH value does not still take place rise even the aqueous sodium hypochlorite solution more than the equivalent is being injected under the situation in the mud.That is, when supplying with the mud of matrixization fully,, can not produce chlorine if the pH of mud more than 2.5, does not then rely on the IR of aqueous sodium hypochlorite solution.
Below following occasion is inquired into, this occasion refers to the factor because of the fault of sludge pump etc., and the mud that flows in the stirred tank rapidly reduces, and, does not comprise enough organic matters that is.Even in this occasion, a spot of hypochlorous acid that when injecting aqueous sodium hypochlorite solution on a small quantity, generates and organism react and consume.At this moment, shown in table 2, the pH value is followed the injection of aqueous sodium hypochlorite solution, slightly rises.Re-inject aqueous sodium hypochlorite solution.If it is like this,, residual so hypochlorous acid does not consume with the organism disappearance of the hypochlorous acid reaction that generates.But because hypochlorous acid does not react with organism, so do not produce hydrochloric acid, the pH value rises sharp.That is, become alkalescence.If like this, then do not produce chlorine.If the mud cutting device through this form of implementation injects Hydrogen chloride and aqueous sodium hypochlorite solution, then the pH of mud does not produce chlorine 2.5 when above.
Confirm under stronger acidity the following experiment of the security when injecting aqueous sodium hypochlorite solution.
With sludge concentration is that the mud of 17100mg/L is taked in the 500mL beaker, when stirring through whipping appts, injects 8.5% the Hydrogen chloride of 9.6mL, and pH is 2.0.Then, press the aqueous sodium hypochlorite solution of 1mL titration 12% at every turn, confirm whether to produce chlorine, also measure the pH value of this moment.Experimental result provides in table.
(table 3)
The chlorine of high concentration sludge produces experiment (SS 17100mg/L adds 500mL, beginning pH2.0)
△: produce zero slightly: produce
Before the titer of aqueous sodium hypochlorite solution arrives 4mL, do not produce chlorine, if but surpassing above-mentioned value carries out titration, then produce chlorine.Originally titrating, with the reaction of organism in the mud, hypochlorous acid is consumed fully, still, carry out titration if surpass 4mL, the organism in the mud of residual reaction hardly then, so, it is believed that to have produced chlorine.Knowing, is 2.0 occasion at the pH of mud, dimension sodium chlorate aqueous solution's IR and to produce chlorine be dangerous.
In the mud cutting device of this form of implementation, must estimate the occasion that breaks down at whipping appts, whether can produce the danger of chlorine.Do not stir and in mud, inject aqueous sodium hypochlorite solution, confirm the experiment that the generation of chlorine has or not.
To the condition that embodiment 3 is implemented, change a part of condition, and being identical conditions, other aspect experimentizes.The condition that changes is when the injection of aqueous sodium hypochlorite solution and after injecting, to stop whipping appts.As result of experiment, do not produce chlorine.Affirmation is in the mud cutting device of this form of implementation, even under the situation that the whipping appts of steel basin breaks down rapidly, still be safe from danger.
Embodiment 7
Be used to investigate and be suitable for the following experiment of IR that mud carries out the aqueous sodium hypochlorite solution of matrixization.
With sludge concentration is that the mud of 25600mg/L is taked in the specified amount beaker, when stirring through whipping appts, generates necessary amount according to hypochlorous acid and injects 8.5% Hydrogen chloride.This mud is taked respectively among container B 1, B2, B3, the B4.In such container B 1, B2, B3, B4, according to the effective chlorine density after the dilution be respectively 400,800,1200, the mode of 1600mg/L injects 12% aqueous sodium hypochlorite solution.After in container B 1, B2, B3, B4, stirring through whipping appts, measure concentration of residual chlorine, investigate having or not of free chlorine.Experimental result provides in table.
(table 4)
The reaction experiment of foldback mud (SS 25600mg/L)
Know according to this experiment, in container B 4, detect free chlorine, if effective chlorine density is 1600mg/L, then sludge concentration is the mud of 25600mg/L relatively, and is superfluous slightly.The hypochlorous acid that must not consume relatively like this, the reductive agent through S-WAT etc. decomposes, and turns back to aerator tank.Know that in the mud that in experiment, adopts, inject the occasion of aqueous sodium hypochlorite solution according to the mode of effective chlorine density below 1200mg/L, S-WAT is unwanted.
In order to investigate the IR that is suitable for mud is carried out the aqueous sodium hypochlorite solution of matrixization, also carried out following experiment.
With sludge concentration is that the mud of 2000mg/L is taked in the specified amount beaker, when stirring through whipping appts, injects 8.5% Hydrogen chloride, to reach the essential mole that waits with generating hypochlorous acid.This mud is taked respectively to inject 12% aqueous sodium hypochlorite solution respectively among container C 1, C2, C3, C4, the C5.5%, 6%, 10%, 12%, 20% the mode of being respectively according to the relative sludge concentration of the effective chlorine density after the dilution among container C 1～C5 is injected.That is, according to the effective chlorine density after the dilution be respectively 100,120,200,240, the mode of 400mg/L injects.In container C 1～C5, stirring 30 minutes the state of the matrixization of investigation mud through whipping appts.
If container C 1, container C 2, container C 3 are compared, know that then the IR of Youxiaolin is many more, then mud carry out matrixization more.But if container C 3 and container C 4 are compared, the state of the matrixization of mud is not big to be changed, and in container C 4, residual chlorine increases.In container C 5, detect free chlorine, with the mud full bleaching.Know,, when the IR of aqueous sodium hypochlorite solution is injected according to the thinning ratio of the effective chlorine density of the value below 12% of sludge concentration, suitably carry out matrixization in the occasion of this mud.If according to surpassing above degree, inject aqueous sodium hypochlorite solution, because residual hypochlorous acid so must decompose through reductive agents such as S-WATs, turns back to aerator tank with it.
Embodiment 9
Carry out when too much injecting the hypochlorous sodium sulfite aqueous solution of decomposition, investigating the experiment of the influence that aerator tank is caused.
According to except too much injecting the aspect of S-WAT, other condition and embodiment 2 identical modes experimentize.That is, except from aerator tank * 2, * 3 and take, in the mud of container Y2, Y3 mesostromaization, inject too much S-WAT aspect beyond, test according to identical condition.For S-WAT, according in container Y2, Y3, measuring concentration of residual chlorine, for the mode of the necessary 2 times amount of the decomposition of concentration of residual chlorine is injected respectively.Carry out 3 weeks of such processing continuously, in aerator tank * 2, * do not see in 3 unusual.Compare with aerator tank * 1, settleability is also good.
In addition, carry out according to from aerator tank * 2, * 3 to take the mud container Y2, the Y3 be 7L, is injected into hypochlorous concentration in these mud and is the experiment that the mode of effective chlorine density 290mg/L is reacted.3～5 times mode according to the IR of the S-WAT of necessity for the concentration of residual chlorine of in the corresponding container of container Y2, Y3, measuring is added S-WAT.Then,, take out these a part of active sludge, it is observed through microscope in that aerator tank was turned round after 2 weeks.For protozoon, be that 100 times opticmicroscope makes the sample that is placed with sample move 72mm through multiplying power, observe.Consequently, for protozoic kind and quantity, aerator tank * 3 are maximum, are aerator tank * 2 secondly.Protozoon is minimum in untreated aerator tank * 1.Even under the situation of the sodium sulfite aqueous solution of necessary 3～5 times of amounts of decomposition of injecting residual chlorine, still can confirm not the aerobic mikrobe of the mud in the aerator tank is impacted.
According to top description; After handling mud, under the situation of residual chlorine being decomposed, still be safe from danger through unnecessary S-WAT even not only can confirm through Hydrogen chloride and Youxiaolin; Even and can confirm under the situation of injecting unnecessary S-WAT; In Youxiaolin is handled, still improve the settleability of the mud of aerator tank, or the phenomenon that microorganism active increases does not change yet.
Do not injecting the few occasion of sodium sulfite aqueous solution or IR, the mud that will comprise residual chlorine turns back to aerator tank.In this occasion, estimate the experiment of the influence that residual chlorine causes aerator tank.
Be equipped with aerator tank E1, E2, E3, E4, in each groove, add sludge concentration according to 5L is the mud of 5000mg/L at every turn.Carry out following operation 1 time every day.From corresponding aerator tank E1～E4, each 1L ground extraction mud is injected among container F 1～F4, in container F 1～F4, injects Hydrogen chloride, then, is that the mode of 400mg/L is injected aqueous sodium hypochlorite solution according to effective chlorine density, stirs 30 minutes.Investigating the concentration of residual chlorine of each container F 1～F4, all is 135mg/L.Mud in the container F 1 directly turns back among the aerator tank E1 same as before.In the mud of container F 2～F4, inject to decompose respectively the necessary sodium sulfite aqueous solution of residual chlorine amount 30%, 60%, 100%, stir, respectively it is turned back to aerator tank E2～E4 then.Then, in aerator tank E1～E4, carrying out aeration handles.Carry out such operation in 10 days repeatedly.
After 10 days, observe the protozoon of the mud in aerator tank E1, E2, E3, the E4, protozoic kind is compared.Consequently, in aerator tank E1, do not find protozoon, can in aerator tank E2～E4, confirm protozoon.In aerator tank E2, protozoic kind is less than aerator tank E3 slightly, and still, the quantity of the protozoic kind of aerator tank E3 and aerator tank E4 is basic identical.Know, though the injection of sodium sulfite aqueous solution be residual chlorine the necessary amount of decomposition 30%, be still enough, still, if, then aerator tank is not impacted in fact more than 60%.
Embodiment 11
In the treatment facility of the organic drainage of real-world operation, carry out the real example experiment.At water displacement 1200m
3In the treatment facility in/sky, the sludge substrate makeup is set puts, turned round 1 year.Sludge substrate makeup is put by the device of the biological mother liquor of modulation of record among the embodiment 1 and its injection device, the sodium sulfite aqueous solution injection device in the downstream that are injected with stirred tank that biological female mud stirs, are arranged at stirred tank etc. is constituted.The mud that from settling bath, extracts specified amount is put in the sludge substrate makeup, and mud carry out matrixization, and the mud of process matrixization turns back in the aerator tank.In addition, be that the mode of 15mg/L turns round according to the residual chlorine in the mud that is injected with after the sodium sulfite aqueous solution.
As the result in 1 year of running, with past, mud is cut down greatly, and in addition, the activity of mud also improves, and settleability is also improved.
Label declaration
Label 3 expression aerator tanks;
Label 4 expression settling baths;
The sour tempering tank of label 15 expressions;
Label 16 is represented stirred tank rapidly;
The slow stirred tank of label 17 expressions;
Label 18 expression residual chlorine decomposers;
Claims (9)
1. the cutting method of a mud, in the method, in aerator tank to comprising in the mud that produces when active sludge treatment is carried out in organic draining; Extract a part of mud out; Through hypochlorous acid it is carried out the matrix processing, the mud that will pass through the matrix processing turns back in the aerator tank, digests through active sludge treatment; Cut down mud, it is characterized in that:
When above-mentioned a part of mud is carried out the matrix processing, in above-mentioned a part of mud, inject Hydrogen chloride or dilute sulphuric acid, stir or mix, then inject aqueous sodium hypochlorite solution, stir more than 5 minutes, mud is carried out the matrix processing.
2. the cutting method of mud according to claim 1 is characterized in that, above-mentioned Hydrogen chloride or the dilute sulphuric acid mode of pH value in 3.5～6.5 scope when above-mentioned a part of mud is carried out the matrix processing injected.
3. method according to claim 1 and 2 is characterized in that, above-mentioned aqueous sodium hypochlorite solution is that the mode in the scope of 300～1600mg/L is injected in the mud of sludge concentration 2000～26000mg/L according to effective chlorine density.
4. the cutting method of mud according to claim 1 and 2 is characterized in that, above-mentioned aqueous sodium hypochlorite solution injects according to the mode of the effective chlorine density of 3～20% value of sludge concentration.
5. according to the cutting method of any one the described mud in the claim 1～4; It is characterized in that; In the mud of above-mentioned process matrix processing, inject sodium sulfite aqueous solution or sodium thiosulfate solution, it is stirred, it is turned back in the aerator tank.
6. the cutting device of a mud; It is arranged in the treatment facility that comprises organic draining; This equipment is made up of aerator tank and settling bath; This aerator tank carries out active sludge treatment to comprising organic draining, and the water sepn that this settling bath will be included in the mud of handling in the above-mentioned aerator tank is supernatant and mud, it is characterized in that:
The cutting device of above-mentioned mud is made up of the sour mixing head of specified length or the sour tempering tank and the stirred tank of specified volume; In this acid mixing head or sour tempering tank; Discharge isolating a part of mud in above-mentioned settling bath, inject Hydrogen chloride or dilute sulphuric acid, mix; This stirred tank is arranged at the downstream of above-mentioned sour mixing head or above-mentioned sour tempering tank, and aqueous sodium hypochlorite solution is injected in the mud;
The whipping appts of regulation is set in above-mentioned stirred tank, and the mud that is injected with above-mentioned aqueous sodium hypochlorite solution stirred more than 5 minutes, and foldback is given above-mentioned aerator tank.
7. the cutting device of mud according to claim 6; It is characterized in that; In the downstream of above-mentioned stirred tank the residual chlorine decomposer is set, injects sodium sulfite aqueous solution or sodium thiosulfate solution in the mud in above-mentioned residual chlorine decomposer, give above-mentioned aerator tank its foldback.
8. according to the cutting device of claim 6 or 7 described mud; It is characterized in that; In above-mentioned stirred tank, pH meter is set, keeps watch on the Hydrogen chloride that in above-mentioned sour mixing head or above-mentioned sour tempering tank, injects or the IR of dilute sulphuric acid according to the mode of pH value in 3.5～6.5 scope of the mud of above-mentioned stirred tank.
9. according to the cutting device of any described mud in the claim 6～8, it is characterized in that above-mentioned stirred tank is made up of placed in-line two a plurality of grooves more than the groove.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009120916A JP4523989B2 (en) | 2009-05-19 | 2009-05-19 | Sludge reduction method and reduction device |
| JP2009-120916 | 2009-05-19 | ||
| PCT/JP2009/006298 WO2010134143A1 (en) | 2009-05-19 | 2009-11-24 | Method and apparatus for reducing sludge amount |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102428043A true CN102428043A (en) | 2012-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801593995A Pending CN102428043A (en) | 2009-05-19 | 2009-11-24 | Method and apparatus for reducing sludge amount |
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| Country | Link |
|---|---|
| JP (1) | JP4523989B2 (en) |
| KR (1) | KR20120025361A (en) |
| CN (1) | CN102428043A (en) |
| WO (1) | WO2010134143A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507876A (en) * | 2012-07-31 | 2015-04-08 | 巴斯夫欧洲公司 | Concentration of suspensions |
| CN110240375A (en) * | 2019-05-20 | 2019-09-17 | 同济大学 | A kind of processing method suitable for excess sludge anaerobic digestion |
| CN113651505A (en) * | 2021-08-23 | 2021-11-16 | 上海市政工程设计研究总院（集团）有限公司 | Multifunctional excess sludge tank and sludge treatment method thereof |
| CN114804555A (en) * | 2022-04-15 | 2022-07-29 | 中国地质大学（武汉） | Control method for killing pathogenic microorganisms and toxic byproducts in sludge by strengthening chlorine disinfection |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5950668B2 (en) * | 2012-04-16 | 2016-07-13 | 四国化成工業株式会社 | Reduction method of excess sludge |
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- 2009-11-24 WO PCT/JP2009/006298 patent/WO2010134143A1/en active Application Filing
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| CN110240375B (en) * | 2019-05-20 | 2021-02-12 | 同济大学 | Method for promoting pre-alcoholization and enhanced anaerobic digestion of excess sludge based on isoelectric points |
| CN113651505A (en) * | 2021-08-23 | 2021-11-16 | 上海市政工程设计研究总院（集团）有限公司 | Multifunctional excess sludge tank and sludge treatment method thereof |
| CN114804555A (en) * | 2022-04-15 | 2022-07-29 | 中国地质大学（武汉） | Control method for killing pathogenic microorganisms and toxic byproducts in sludge by strengthening chlorine disinfection |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4523989B2 (en) | 2010-08-11 |
| WO2010134143A1 (en) | 2010-11-25 |
| KR20120025361A (en) | 2012-03-15 |
| JP2010029842A (en) | 2010-02-12 |
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Application publication date: 20120425 |