CN103663696B - A kind of membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal - Google Patents
A kind of membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal Download PDFInfo
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Abstract
The invention discloses a kind of membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal, it is by A
2the integrated reactor that/O technique, biomembrane process and membrane bioreactor form, is made up of anaerobic pond, anoxic pond, Aerobic Pond, water inlet system, aerating system, water exhaust system and robot.All be equipped with half soft biofilm packing in anaerobic pond, anoxic pond, Aerobic Pond, membrane module is placed in Aerobic Pond and does not establish membrane separation zone separately.This reactor carries out the poly-phosphorus in anaerobic phosphorus release and Aerobic Pond by the mud on biologic packing material in anaerobic pond, improve the total tp removal rate in sewage, preserved szechuan pickle waste water carries out hydrolysis of organic matter acidifying after anaerobic pond, and organonitrogen carries out ammonification; Nitrification liquid in Aerobic Pond is back to anoxic pond, in anoxic pond, forms denitrification.The present invention has that structure is simple, process pollutent usefulness is high, and fouling membrane is light, can process the pollutent such as organism, total nitrogen, total phosphorus, SS of high-salt wastewater simultaneously.
Description
Technical field
The invention belongs to sewage disposal, environmental protection technical field, be specifically related to a kind of membrane bioreactor processing the enhanced biological phosphorus removal denitrogenation of high salt height nitrogen phosphorus preserved szechuan pickle waste water.
Background technology
Along with the fast development of reservoir area of Three Gorges economy, the industrial scale of its mainstay industry hot pickled mustard tube is increasing, every year will to the undressed high salt height nitrogen phosphorus organic wastewater of reservoir area of Three Gorges discharge about 500 ten thousand steres in its production process, namely the pollutent organism (in COD) entering reservoir is every year 2,225 ten thousand tons, 800,000 tons, nitrogen and 130,000 tons, phosphorus, forms serious threat to Water Environment of Three Gorges.The waste water salinity that hot pickled mustard tube industry produces is up to 2% ~ 15%, and organic contamination substrate concentration is up to 3 ~ 20g/L, and concentration of suspension up to 7g/L, and has very high concentration of nitrogen and phosphorus.High salt preserved szechuan pickle waste water has restraining effect to microorganism active, causes microorganism in the settleability of traditional biological process active sludge variation, bio-reactor to be difficult to assemble, therefore, adopts traditional biological facture to process preserved szechuan pickle waste water and has larger difficulty.So the sewage disposal technology developing a kind of applicable process high salt height nitrogen preserved szechuan pickle waste water pollutes solution reservoir area of Three Gorges hot pickled mustard tube sewage discharge and is significant.
Membrane bioreactor (MBR) is a kind of efficient biochemical sewage disposal technology biologic treating technique and film high efficiency filter technology combined, also referred to as membrane separation activated sludge process.Membrane bioreactor has and efficiently retains feature, makes system water outlet concentration of suspension extremely low, but also have make pollutent fast, the efficient advantage removed.In preserved szechuan pickle waste water process, carry out MBR technology, a large amount of gathering dominant bacteria microorganism in reactor can be made and not by the restriction of Effects of Salinity, add sludge concentration in Iarge-scale system, make microorganism more thorough to organic degraded.
Anaerobism-anoxic-aerobic activated sludge process (A
2/ O) be a kind of simultaneous phosphorus and nitrogen removal technique efficiently, be made up of anaerobic pond, anoxic pond and Aerobic Pond three pond bodies.A
2/ O has simple structure, total hrt is short, controlling run simple.
Chinese patent literature (CN102285715A) discloses a kind of hybrid mbr for the treatment of preserved szechuan pickle waste water, this technology utilizes single aerobic biologic membrane (bio-reaction zone)+membrane bioreactor (membrane separation zone) to process saliferous preserved szechuan pickle waste water, although can degradable organic pollutant effectively, but it to the total nitrogen (TN) of high nitrogen phosphorus preserved szechuan pickle waste water and total phosphorus (TP) clearance on the low side, and aerobic reactor zone and membrane separation zone are provided separately by this technology, floor space is comparatively large, adds the aeration rate of system.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of waste disposal plant for the treatment of high salt height nitrogen phosphorus preserved szechuan pickle waste water, it can reduce the restraining effect of waste water salinity to microorganism, increase the concentration of mud in reactor, strengthen microorganism to organic degradation capability, the removal efficiency of TN, TP can be improved again, and can floor space be reduced.
In order to the above-mentioned technical problem solved, the present invention includes tactic anaerobic pond, anoxic pond and Aerobic Pond, sewage enters anaerobic pond through water inlet pipe, anaerobic pond is communicated with by the prosopyle that partition wall is offered with anoxic pond, anoxic pond is communicated with by the prosopyle that partition wall is offered with Aerobic Pond, nitrification liquid in Aerobic Pond to be pumped through return line by reflux pump and is back to anoxic pond, anoxic pond is built-in with whipping appts, the membrane module that Aerobic Pond is built-in with is connected with header, sewage after process is discharged by header, anaerobic pond, half soft biofilm packing is equipped with in anoxic pond and Aerobic Pond.
Due to the combination of anaerobic pond-anoxic pond-Aerobic Pond and membrane bioreactor, sludge settling property in reactor can be made on the one hand not to be subject to the impact of salinity, the inefficient shortcoming of single aerobic biological film method process height nitrogen phosphorus preserved szechuan pickle waste water denitrogenation phosphorus can be overcome on the other hand, improve system to the removal efficiency of total nitrogen total phosphorus.In Aerobic Pond, membrane module is set, does not set up membrane separation zone separately, reduce floor space.
So technique effect of the present invention is: reduce the restraining effect of waste water salinity to microorganism, add the concentration of mud in reactor, enhances microorganism to organic degradation capability, improve the removal efficiency of TN, TP, reduce floor space.
Accompanying drawing explanation
Fig. 1 is floor map of the present invention;
Fig. 2 is the 1-1 sectional view of Fig. 1;
Fig. 3 is the 2-2 sectional view of Fig. 1.
In figure: 1. anaerobic pond, 2. anoxic pond, 3. Aerobic Pond, 4. water inlet pipe, 5 prosopyles, 7. membrane module, 8. header, 9. reflux pump, 10. return line, 11. half soft biofilm packings, 12. agitators, 13. boring aeration pipes, 14. pneumatic pumps, 15. suction pumps, 16.PLC controlling box, 19. valves, 20 partition walls.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Design of the present invention is, by A
2the integral process that/O technique, biomembrane process and membrane bioreactor combine, for the treatment of the preserved szechuan pickle waste water of high salt height nitrogen phosphorus.
As Fig. 1, shown in Fig. 2, the present invention includes tactic anaerobic pond 1, anoxic pond 2 and Aerobic Pond 3, sewage enters anaerobic pond through water inlet pipe 4, anaerobic pond 1 is communicated with by the prosopyle 5 that partition wall 20 is offered with anoxic pond 2, anoxic pond 2 is communicated with by the prosopyle 5 that partition wall 20 is offered with Aerobic Pond 3, nitrification liquid in Aerobic Pond 3 to be pumped through return line 10 by reflux pump 9 and is back to anoxic pond 2, anoxic pond 2 is built-in with whipping appts 12, the membrane module 7 that Aerobic Pond 3 is built-in with is connected with header 8, sewage after process is discharged by header 8, anaerobic pond 1, half soft biofilm packing 11 is equipped with in anoxic pond 2 and Aerobic Pond 3.
The mixed liquid recycle ratio being back to anoxic pond 2 from Aerobic Pond 3 is 100% ~ 300%.Above-mentioned membrane module 7 is hollow fiber film assembly.
Be equipped with half soft biofilm packing 11 in above-mentioned anaerobic pond 1, anoxic pond 2 and Aerobic Pond 3, biofilm density is respectively 30%, 30%, 40%, for the mud of the dominant bacteria in fixing each pond, decreases conventional A
2sludge refluxing apparatus in/O technique.
Be provided with boring aeration pipe 13 at the bottom of described Aerobic Pond 3 pond, hole position connects porous aeration head, and boring aeration pipe 13 is connected with the pneumatic pump 14 outside pond, in pond, form aerating system; Aerobic Pond 3 and membrane module 7 share a set of aerating system.
As shown in Figure 3, the header 8 that each membrane module 7 connects is respectively equipped with valve 19.By the open degree control treatment water yield of valve 19, membrane module 7 is connected by the suction pump 15 that header 8 and pond are external; Under the film silk inside and outside differential pressure effect that the suction of suction pump 15 is formed, sewage is clamp-oned membrane module 7 inner, the sewage after process discharges this reactor by header 8.Suction pump 15 adopts periodic running mode, takes out, is controlled by PLC control cabinet 16 between the stopping time.
Working process of the present invention is:
Sewage enters anaerobic pond 1 through water inlet pipe 4, under anaerobic, the polyphosphoric acid salt stored in polyP bacteria releasing body, active absorption voltaile fatty acid (VFA) simultaneously, and store in vivo, so partial organic substances is removed at anaerobic pond with the form of polyhydroxyalkanoate (PHA); The water outlet of anaerobic pond 1, by the prosopyle 5 on the partition wall 20 between anaerobic pond 1 and anoxic pond 2, enters anoxic pond 2.The nitrification liquid that the carbon source that denitrifying bacteria utilizes water inlet to provide refluxes for electron donor and Aerobic Pond 3 carries out denitrification for electron acceptor(EA), and NO3-N and NO2-N is converted into gaseous nitrogen, to reach the object improving TN clearance.Anoxic pond 2 is communicated with by the prosopyle 5 that partition wall 20 has with Aerobic Pond 3, and sewage enters the aerobic sludge contacting high density in Aerobic Pond 3, and in sewage, most of organism is removed.Sewage after process clamp-ons membrane module 7 under the suction function of suction pump 15, and membrane module 7 is connected with header 8, is discharged outside system by sewage.
Compared with the prior art, the present invention has the following advantages as follows:
1, the present invention is equipped with half soft biofilm packing in anaerobic pond, anoxic pond and Aerobic Pond, make mud be fixed on biologic packing material, its advantage has, and one is to assemble a large amount of dominant bacteria microorganism in each pond, increase the quantity of microorganism in reactor, improve the treatment efficiency of preserved szechuan pickle waste water; Two is the sludge bulking slowed down under high salt condition; Three be Microorganism incubation on biologic packing material, the impact that mud pollutes membrane module can be alleviated; Four is to existing A
2/ O process pool, can cancel the reflux of mud.
2, the present invention is by A
2/ O technique and membrane bioreactor organically combine, and have the advantage of two kinds of techniques concurrently, efficiently can process the preserved szechuan pickle waste water of high salt height nitrogen phosphorus.On the one hand, utilize the efficient crown_interception of membrane module, improve sludge concentration in reactor, make contaminant degradation more thorough; , hydraulic detention time (HRT) is separated completely with sludge retention time (SRT) meanwhile, the concentration of the nitrifier that generation time is long in system can be improved, improve nitrification efficiency; And membrane module replaces second pond to carry out mud-water separation, can reduce the impact of salinity on sludge settling property.On the other hand, because preserved szechuan pickle waste water water inlet TN is very high, single aerobic membrane bioreactor denitrification percent is on the low side.Phosphorus, the excessive suction phosphorus of Aerobic Pond is released, A by anaerobic pond
2the removal of phosphorus not only can be strengthened in/O technique, and by the nitrification liquid in Aerobic Pond is back to anoxic pond, intensified anti-nitrated in anoxic pond, the clearance of TN can be increased substantially.
3, the present invention inserts membrane module in Aerobic Pond, and does not establish separately membrane separation zone, can save the floor space of reactor; Meanwhile, aerobic reaction pond and membrane module share a set of aerating system, can reduce aeration rate, under the effect that aeration washes away, can clean in fenestra and mud, the organism of film surface deposition, alleviate the degree of fouling membrane, make membrane flux maintain a maintenance level.
4, the biologic packing material in described anaerobic pond, anoxic pond and Aerobic Pond, continuous collision and friction, the biologic packing material of aerobic zone is also subject to the effect that aeration washes away simultaneously, wash away the mud that filling surface is aging, make the activity that on microbial film, the maintenance of microorganism is higher, improve the removal usefulness of microbe.
Embodiment
Main technical details is:
Total nitrogen load: 0.07 ~ 0.1kgTN/ (kgMLVSSd)
Working time: suction pump is opened 9min and stopped 2min
Biofilm density: anaerobic zone, oxygen-starved area, aerobic zone are respectively 30%, 30%, 40%
Dissolved oxygen: anaerobic zone is <0.5mg/L, oxygen-starved area is 0.5 ~ 1.0mg/L, and aerobic zone is 3 ~ 4mg/L
Mean hydraulic residence time: anaerobic zone is 1.5h, oxygen-starved area is 1.5 ~ 2.5h, and aerobic zone is 8 ~ 9h
Constructing variable:
Available depth: 4 ~ 6m
The volume ratio of anaerobic zone, oxygen-starved area, aerobic zone is 1: 2: 5.
This embodiment is when best hydraulic load, the clearance of its COD, ammonia nitrogen, TN, soluble phosphate and SS is respectively 91.67%, 90.61%, 68.46%, 40.54% and 98%, contrast single aerobic biologic membrane+membrane bioreactor and process saliferous preserved szechuan pickle waste water, its total nitrogen total phosphorus removal effect is better.
What adopt in the present invention is combined semi soft cellulose filler, be evenly distributed on the periphery of grog ring plate, tow can not come off, avoid the phenomenon of filler center conglomeration simultaneously, in the middle of plastics ring plate, flakes acupuncture spline structure can play again good water distribution, gas distribution effect, advantages such as making this filler have mass transfer effect good, do not block, shock-resistant, process is stable.
Claims (5)
1. the membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal, it is characterized in that: comprise tactic anaerobic pond (1), anoxic pond (2) and Aerobic Pond (3), sewage enters anaerobic pond (1) through water inlet pipe (4), anaerobic pond (1) is communicated with by the prosopyle (5) that partition wall (20) is offered with anoxic pond (2), anoxic pond (2) is communicated with by the prosopyle (5) that partition wall (20) is offered with Aerobic Pond (3), nitrification liquid in Aerobic Pond (3) is pumped through return line (10) by reflux pump (9) and is back to anoxic pond (2), anoxic pond (2) is built-in with whipping appts (12), the membrane module (7) that Aerobic Pond (3) is built-in with, membrane module (7) is connected with header (8), sewage after process is discharged by header (8), anaerobic pond (1), half soft biofilm packing (11) is equipped with in anoxic pond (2) and Aerobic Pond (3).
2. a kind of membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal according to claim 1, is characterized in that: in anaerobic pond (1), anoxic pond (2) and Aerobic Pond (3), the biofilm density of half soft biofilm packing (11) is respectively 30%, 30%, 40%.
3. a kind of membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal according to claim 2, it is characterized in that: at the bottom of described Aerobic Pond (3) pond, be provided with boring aeration pipe (13), hole position connects porous aeration head, and boring aeration pipe (13) is connected with the pneumatic pump (14) outside pond.
4. a kind of membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal according to claim 1,2 or 3, it is characterized in that: the header (8) that membrane module (7) connects is provided with valve (19), membrane module (7) is connected by the suction pump (15) that header (8) is external with pond.
5. a kind of membrane bioreactor for the treatment of the denitrogenation of preserved szechuan pickle waste water enhanced biological phosphorus removal according to claim 4, is characterized in that: the volume ratio of described anaerobic pond, anoxic pond, Aerobic Pond is 1: 2: 5.
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