CN102786138B - Sectionalized sewage treatment tank using cyclic activated sludge system - Google Patents
Sectionalized sewage treatment tank using cyclic activated sludge system Download PDFInfo
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- CN102786138B CN102786138B CN201210257819.7A CN201210257819A CN102786138B CN 102786138 B CN102786138 B CN 102786138B CN 201210257819 A CN201210257819 A CN 201210257819A CN 102786138 B CN102786138 B CN 102786138B
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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
Abstract
The invention discloses a sectionalized sewage treatment tank using a cyclic activated sludge system. The sewage treatment tank comprises a tank body; the tank body is provided with a water inlet, a water outlet and a surplus sludge discharge outlet and is partitioned by division plates into a pre-anaerobic zone, an anaerobic zone, an anoxic zone and an aerobic zone which are of different volumes, wherein the volume of the aerobic zone is greater than the volume of the anoxic zone, and the volume of the anoxic zone is greater than the volume of the anaerobic zone; stirrers are respectively arranged in the pre-anaerobic zone, the anaerobic zone and the anoxic zone; an aeration device, an aerobic sludge circulating pump and a water decanter are installed in the aerobic zone; sludge flows back in two stages, wherein the sludge is recycled from the aerobic zone to the anoxic zone in the first stage and then flows back from the anoxic zone to the pre-anaerobic zone in the second stage. According to the invention, sectionalized and staged cycling of the sludge enables anaerobic and anoxic states to be optimal, phosphorus accumulating organisms, anti-denitrifying bacteria and nitrobacteria in the sludge can realize phosphorus removal and nitrogen removal under optimal conditions, and therefore, a good nitrogen, phosphorus and organic matter removal effect is achieved.
Description
Technical field
The present invention relates to a kind of sewage Wastewater Treated by Activated Sludge Process pond, particularly a kind of subregion circulating active sludge method treatment tank, this treatment tank is more suitable for biological denitrificaion and the dephosphorization of sanitary sewage or municipal effluent.
Background technology
Circulating active sludge method (Cyclic Activated Sludge System, claims again CASS) is one of main method of sanitary sewage and municipal sewage treatment.This technique is invented in 1989 by the Goronszy of U.S. Trans Enviro company, to sequencing batch active sludge (Sequencing Batch Reactor, claim again SBR) significant improvement, retained the characteristic that SBR technology investment is little, working cost is low, flexible and changeable, simultaneously owing to having increased selection pond, suppressing the ubiquitous thread fungus of active sludge expands, therefore, can obtain the better active sludge of sedimentation function, be one of main technique of current sanitary sewage and municipal effluent Wastewater Treated by Activated Sludge Process.
But this technique is in operation and also has some problems, be mainly to select pond owing to being only provided with, without obvious subregion, denitrification mainly passes through to control flco yardstick in the inner oxygen-starved area that forms of flco under good oxygen condition, by synchronous nitration-denitrification, carries out denitrification.In this case, even if formed good in big flocculating body in CASS pond, but because the required carbon source of denitrification (organism) need be by diffusing through the aerobic layer of flco, could arrive flco inner, in this process, organism is consumed in a large number by aerobic microbiological, therefore, in fact denitrification mainly completes by endogenous respiration, and mainly by aerobic microbiological, be oxidized for denitrifying organism, not only consumed a large amount of dissolved oxygens, cause energy wastage, and nitric efficiency is lower, this point is particularly outstanding for the lower sewage of C/N.
In addition, because the nitric efficiency of circulating active sludge method is low, in water outlet and mud, contain a large amount of nitrate, when sludge reflux is during to anaerobic selection pond, nitrate is also brought into and selected pond, cause anaerobic selection pond in fact not enter anaerobic state (for anoxic condition), reduced the release of polyP bacteria to phosphorus, then affect the phosphor-removing effect of whole system.
Summary of the invention
In order to overcome the problem that the denitrogenation of circulating active sludge method and dephosphorization efficiency by using are lower, energy consumption is high, the object of the invention is to, a kind of subregion circulating active sludge method treatment tank is provided, by different regions is set in pond, create respectively polyP bacteria, denitrifying bacteria and nitrifier adapt circumstance and condition the most, active sludge circulates according to subregion in pond simultaneously, completes respectively release, the denitrification and nitrated of phosphorus, thereby reaches the object of efficient denitrification and dephosphorization.
In order to realize above-mentioned task, the technical solution that the present invention adopts is as follows:
A kind of subregion circulating active sludge method treatment tank, comprise pond body, on the body of pond, there are water-in, water outlet and excess sludge discharge mouth, it is characterized in that, described pond body is divided into volume different pre-anaerobic zone, anaerobic zone and oxygen-starved area and aerobic zone by dividing plate, wherein, the volume of aerobic zone is greater than oxygen-starved area, and the volume of oxygen-starved area is greater than anaerobic zone; In pre-anaerobic zone, anaerobic zone and oxygen-starved area, be respectively equipped with agitator, in aerobic zone, be provided with aerating apparatus, aerobic sludge recycle pump and strain hydrophone;
Mud divides two-stage to reflux, and the first step is that mud is circulated to oxygen-starved area through aerobic zone, and the second stage is back to pre-anaerobic zone through oxygen-starved area.
Subregion circulating active sludge method treatment tank of the present invention, in pre-anaerobic zone, anaerobic zone and oxygen-starved area, agitator is set respectively, for making mixed solution in district in suspended state, the microorganism of being convenient in mixed solution fully contacts with pollutent, the mud of aerobic zone precipitation returns to aerobic zone again through oxygen-starved area, form nitrated-denitrification denitrogenation; The mud of oxygen-starved area removes after remaining nitrate through pre-anaerobic zone, entering anaerobic zone mixes with former water again, thereby create best anaerobic environment, at this, polyP bacteria in mud is released phosphorus by being hydrolyzed the poly-phosphorus self forming, and the organic synthesis PHA in the former water of energy absorption of acquisition, enters follow-up oxygen-starved area and aerobic zone, polyP bacteria utilizes nitrate and oxygen oxidation, and in anaerobic zone, synthetic PHA gathers phosphorus fully, thereby obtains higher enhanced biological phosphorus removal efficiency.
Compare with existing circulating active sludge method, because treatment tank of the present invention has adopted the form of subregion, by segmentation circulating active sludge, thereby can in reaction tank, build strict anaerobism, anoxic and aerobic zone, form best anaerobic phosphorus release, denitrification phosphorus-collecting and aerobic phosphorous accumulating, the environment of aerobic nitrification, the polyP bacteria in mud, denitrifying bacteria and nitrifier Ke Ge district carry out corresponding biological respinse with best state.Simultaneously, in order to improve the effect of dephosphorization, the mode of its subregion circulation, having overcome original circulating active sludge method sludge reflux mode is that aerobic zone mixed solution is once directly back to anaerobic selection pond, nitrate in aerobic zone is brought back to anaerobic pond, affect the defect of anaerobic phosphorus release.
The backflow of mud is carried out in two steps, first the mixed solution with nitrate being refluxed by aerobic zone is back to anoxic pond and carries out denitrification, nitrate concentration in mixed solution is significantly reduced, and then be back to pre-anaerobic zone, at this, denitrifying bacteria utilizes the endogenous carbon of self that the nitrate in mixed solution is removed completely, then enter anaerobic pond, guaranteed the best anaerobic state of anaerobic pond, for the anaerobic phosphorus release of polyP bacteria has been created the suitableeest condition, therefore, phosphor-removing effect is also expected to be further improved simultaneously.It is core of the present invention that the substep of the subregion of biological reaction tank and mud (or mixed solution) refluxes.Subregion is not increasing under the condition of original reaction zone volume, has created best biological respinse environment, and therefore, biological respinse (denitrogenation, dephosphorization and removal COD) efficiency can increase substantially; And substep backflow is only that an original step is refluxed, be decomposed into two steps, the quantity of reflux of the first step is with original identical, and the quantity of reflux of second step also can reduce, total lift height does not become, therefore, the energy consumption of mixed-liquor return (or power) does not only increase, and also decreases on the contrary.
Accompanying drawing explanation
Fig. 1 is the structural map of the circulating active sludge method treatment tank of prior art employing, and wherein (a) is orthographic plan, is (b) sectional drawing.
Fig. 2 is the structural map of subregion circulating active sludge method treatment tank of the present invention, and wherein (a) is orthographic plan, is (b) and (c) sectional drawing.
Fig. 3 is the another kind of structural map (oxygen-starved area 5 adopt combination types) of subregion circulating active sludge method treatment tank of the present invention, and wherein (a) is orthographic plan, is (b) and (c) sectional drawing.
Label in figure represents respectively: 1, pond body, 2, dividing plate, 3, pre-anaerobic zone, 4, anaerobic zone, 5, oxygen-starved area, 6, aerobic zone, 7, agitator, 8, aerating apparatus, 9, aerobic sludge recycle pump, 10, anoxic sludge recycle pump, 11, strain hydrophone, 12, water-in, 13, water outlet, 14, sludge pump.Solid arrow in figure represents water (flow) direction, and dotted arrow represents sludge reflux direction.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment
Referring to accompanying drawing 2, subregion circulating active sludge method treatment tank of the present invention, comprise pond body 1, on pond body 1, there are water-in 12 and water outlet 13 and mud discharging mouth 14, pond body 1 is divided into the different pre-anaerobic zone 3 of cross-sectional area, anaerobic zone 4, oxygen-starved area 5 and aerobic zone 6 by dividing plate 2, wherein, the area of aerobic zone 6 is greater than oxygen-starved area 5, and the area of oxygen-starved area 5 is greater than anaerobic zone 4.In pre-anaerobic zone 3, anaerobic zone 4 and oxygen-starved area 3, agitator 7 is housed, in oxygen-starved area 3, is provided with anoxic sludge recycle pump 11; In aerobic zone 6, there are aerating apparatus 8, aerobic sludge recycle pump 9 and strain hydrophone 11.
The principle of work of subregion circulating active sludge method treatment tank of the present invention is: first sewage enter the anaerobic zone 4 in pond body 1 by water-in 12, mix with the mud refluxing from pre-anaerobic zone 3, polyP bacteria in mud absorbs the organism in water inlet fast, releases phosphorus simultaneously, then enter oxygen-starved area 5, at this, the mud refluxing with aerobic zone 6 carries out hypoxia response, on the one hand, polyP bacteria utilizes the nitrate in mixed solution to carry out denitrification phosphorus-collecting, on the other hand, the denitrifying bacteria in returned sluge utilizes remaining organism in former water to carry out denitrification, realizes denitrification phosphorus-collecting and denitrification simultaneously, mixed solution small portion after anoxic is back to pre-anaerobic zone 3 and further carries out denitrification, remove the nitrate in mud completely, for anaerobic phosphorus release is created good condition, residue major part enters aerobic zone 6, the airborne oxygen that polyP bacteria in this mud utilizes aerating apparatus 8 to provide, oxidation is 4 organism that absorb in anaerobic zone, carry out aerobic suction phosphorus, simultaneously, nitrifier also utilizes the airborne oxygen that aerating apparatus 8 provides to carry out nitrated, for denitrification phosphorus-collecting and denitrification denitrogenation provide condition, treat the nitrogen in water, phosphorus and organism are all reduced to after the concentration of requirement, aerating apparatus 8 stops air feed, precipitate, water outlet is discharged through water outlet 13 by straining hydrophone 11, excess sludge is discharged by sludge pump 14, maintain the balance of whole reaction.So move in circles.The pollutents such as the organism in sewage, nitrogen and phosphorus are removed, and reach the object of simultaneously removing organism, nitrogen and phosphorus.
In technique scheme, width according to pond body 1, oxygen-starved area 5 can adopt discrete (Fig. 2), be that oxygen-starved area consists of two reaction tanks, or combination type, oxygen-starved area forms (Fig. 3) by a reaction tank, and the former is suitable for the wider occasion of pond body, the latter is suitable for the narrower occasion of pond body, to meet different design requirementss.
Be below the embodiment that contriver provides, it should be noted that, following embodiment is some preferably examples, and main purpose is to understand better the present invention, the invention is not restricted to these embodiment.
Embodiment 1:
Certain university's park design adopts subregion circulating active sludge method of the present invention to process campus district sanitary sewage, and reaction tank is long is 24m, and wide is 8m, depth of water 5.5m, and cubic capacity is 1056m
3wherein the volume of pre-anaerobic zone 3 and anaerobic zone 4 is respectively 88m3, the volume of oxygen-starved area 5 is 176m3, aerobic zone 6 volumes are 704m3, the volumetric ratio of anaerobic zone and oxygen-starved area sum and aerobic zone is 1:2, oxygen-starved area 5 adopts the separated structure shown in Fig. 2, by two reaction tanks, forms oxygen-starved area, respectively configures 1, the agitator that 1 power is 0.5KW in four reaction tanks of anaerobic zone and oxygen-starved area.The COD of sewage concentration that enters treatment system is 300~500mg/L, total nitrogen 40~60mg/L, total phosphorus 3~6mg/L.After processing, the COD concentration of water outlet is 30~50mg/L, total nitrogen 10~15mg/L, and total phosphorus 0.2~0.5mg/L, can meet the one-level A standard in national urban wastewater treatment firm pollutant emission standard GB18918-2002.
Embodiment 2:
Certain Designing Sewage Treatment Plant adopts circulating active sludge method (CASS) Treating Municipal Sewage shown in Fig. 1, and the volumetric ratio of design anaerobic zone 4 and aerobic zone 6 is 1:8.The municipal effluent COD concentration that enters treatment system is 300~500mg/L, total nitrogen 40~60mg/L, total phosphorus 3~6mg/L.Owing to containing a large amount of nitrate in the mud refluxing, therefore, nitrate concentration in anaerobic zone maintains 3mg/L left and right, almost do not release phosphorus, after processing, the COD concentration of water outlet is 30~50mg/L, total nitrogen 15~20mg/L, total phosphorus 1~2mg/L, only can meet the secondary standard in national urban wastewater treatment firm pollutant emission standard GB18918-2002.
Adopt the structure (Fig. 3) of subregion circulating active sludge method treatment tank of the present invention to transform, the volumetric ratio of improved anaerobic zone 4 and oxygen-starved area 5 sums and aerobic zone 6 is 1:2, oxygen-starved area 5 adopts combination type, be a reaction tank, sludge reflux transform secondary of the present invention as by original once backflow and refluxes.Nitrate concentration in anaerobic zone 4 significantly reduces, and is generally less than 1mg/L, has obtained good anaerobic phosphorus release, and nitric efficiency also increases substantially.After transformation under same flooding velocity and water quality, the COD concentration of water outlet is 30mg/L~50mg/L, total nitrogen 10mg/L~15mg/L, total phosphorus is less than 0.5mg/L, can meet the one-level A standard in national urban wastewater treatment firm pollutant emission standard GB18918-2002.
Claims (1)
1. a subregion circulating active sludge method treatment tank, comprise pond body (1), on pond body (1), there are water-in (12), water outlet (13) and excess sludge discharge mouth (14), it is characterized in that, described pond body (1) is divided into the different pre-anaerobic zone (3) of volume, anaerobic zone (4) and oxygen-starved area (5) and aerobic zone (6) by dividing plate (2), wherein, the volumetric ratio of anaerobic zone (4) and aerobic zone (6) is 1:8; The volumetric ratio of anaerobic zone (4) and oxygen-starved area (5) sum and aerobic zone 6 is 1:2;
In pre-anaerobic zone (3), anaerobic zone (4) and oxygen-starved area (5), there is respectively agitator (7), in oxygen-starved area (5), be provided with anoxic sludge recycle pump (10), in aerobic zone (6), have aerating apparatus (8), aerobic sludge recycle pump (9) and strain hydrophone (11);
Principle of work is: first sewage enter the anaerobic zone (4) in pond body (1) by water-in (12), mix with the mud refluxing from pre-anaerobic zone (3), polyP bacteria in mud absorbs the organism in water inlet fast, releases phosphorus simultaneously, then enter oxygen-starved area (5), at this, the mud refluxing with aerobic zone (6) carries out hypoxia response, on the one hand, polyP bacteria utilizes the nitrate in mixed solution to carry out denitrification phosphorus-collecting, on the other hand, the denitrifying bacteria in returned sluge utilizes remaining organism in former water to carry out denitrification, realizes denitrification phosphorus-collecting and denitrification simultaneously, mixed solution small portion after anoxic is back to pre-anaerobic zone (3) and further carries out denitrification, remove the nitrate in mud completely, for anaerobic phosphorus release is created good condition, residue major part enters aerobic zone (6), the airborne oxygen that polyP bacteria in this mud utilizes aerating apparatus (8) to provide, the oxidation organism that (4) absorb in anaerobic zone, carry out aerobic suction phosphorus, simultaneously, the airborne oxygen that nitrifier also utilizes aerating apparatus (8) to provide carries out nitrated, for denitrification phosphorus-collecting and denitrification denitrogenation provide condition, treat the nitrogen in water, phosphorus and organism are all reduced to after the concentration of requirement, aerating apparatus (8) stops air feed, precipitate, water outlet is discharged through water outlet (13) by straining hydrophone (11), excess sludge is discharged by sludge pump (14), maintain the balance of whole reaction, so move in circles, the pollutents such as the organism in sewage, nitrogen and phosphorus are removed, and reach the object of simultaneously removing organism, nitrogen and phosphorus,
Described oxygen-starved area (5) is combination type, a reaction tank, consists of, and forms different subregions.
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CN103787498B (en) * | 2013-11-03 | 2015-03-04 | 北京工业大学 | Rapid starting method of low-temperature low C/N sewage improvement A2/O process |
CN104310587A (en) * | 2014-10-29 | 2015-01-28 | 广州华浩能源环保集团有限公司 | Denitrification and dephosphorization wastewater treatment system and process |
CN105668940A (en) * | 2016-03-31 | 2016-06-15 | 武汉绿明利环能股份有限公司 | Ecological ICPS municipal domestic sewage treatment method |
CN106830322A (en) * | 2017-03-02 | 2017-06-13 | 南京市市政设计研究院有限责任公司 | It is a kind of suitable for low CN than modified form AAO ponds that sewage/wastewater is administered |
CN107601669A (en) * | 2017-11-01 | 2018-01-19 | 济宁市孚源环保科技有限公司 | A kind of method based on MBBR technique upgrade expanding biochemistry pools |
CN107698025B (en) * | 2017-11-08 | 2023-06-02 | 中机国际工程设计研究院有限责任公司 | Integrated sewage denitrification and dephosphorization device |
CN107651753B (en) * | 2017-11-08 | 2023-06-02 | 中机国际工程设计研究院有限责任公司 | Sewage denitrification and dephosphorization device |
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