A kind of facultative aerobic membrane bioreactor is processed the method for livestock breeding wastewater
Technical field
The present invention relates to a kind for the treatment of process of livestock breeding wastewater, especially relate to a kind of method of utilizing facultative aerobic membrane bioreactor to process livestock breeding wastewater.
Background technology
Livestock breeding wastewater suspended substance is many, ammonia nitrogen concentration is high, organic concentration is high, stink is large, but also contains the characteristics such as pathogenic agent that excrete with livestock and poultry, and intractability is difficult to qualified discharge greatly and after traditional technology processing.
Breeding wastewater adopts the biological treatments such as natural biology treatment technology, Anaerobic Methods in Treating, aerobic treatment technology, combination treatment technology at present mostly.For single aerobic, anaerobic treatment effect is unsatisfactory, plant's waste water generally adopts anaerobism+aerobic biochemical combination treatment technology at present.
Conventional Anaerobic Methods in Treating has: UASB, AF, UBF, USR, two phase anaerobic method;
Conventional aerobic treatment technology has: active sludge, biological filter, catalytic oxidation, SBR, blodisc;
Conventional advanced treatment technology: oxidation pond, artificial swamp, soil sanitation.
Fig. 1 is shown in the technical process of tradition anaerobism+aerobic biochemical combination treatment.
tradition anaerobism+aerobic biochemical combination treatment technique is not enough: complex process, anaerobism natural pond slag be good utilisation not; Surplus sludge volume is many; Effluent quality difficulty is up to standard; Investment is large, and energy consumption is high; Level of automation is low, and operation is complicated.
Membrane bioreactor is the new type water treatment technology that high performance membrane isolation technique combines with active sludge, the tool potentiality of generally acknowledging as 21 century and the environmental improvement technology of competitive power, become at present in the desirable technique processed of water reuse field and high concentrated organic wastewater.Yet traditional aerobic membrane bioreactor Process on Ammonia Nitrogen treatment effect is unsatisfactory, and energy consumption is high, is difficult to realize discharged wastewater met the national standard.
Summary of the invention
The object of this invention is to provide a kind of method of utilizing facultative aerobic membrane bioreactor to process livestock breeding wastewater, overcome existing routine biochemistry treatment process and general membrane biological reactor process treatment effect is not good, energy consumption is high, and sludge creation amount is large, floor space is large, invests high defect.
Technical scheme of the present invention, a kind of method of utilizing facultative aerobic membrane bioreactor to process livestock breeding wastewater, comprises the following steps:
1. livestock breeding wastewater is first through aerobic or anaerobic technique pre-treatment;
2. water outlet after pretreatment enters the equalizing tank regulating water quality water yield;
3. water quality and quantity regulates rear sewage to enter facultative aerobic membrane bioreactor.
In step 3, by optimizing aerating system intensity distribution, middle and lower part, facultative aerobic membrane bioreactor film district is aerobic zone particularly, and dissolved oxygen remains on 2-5mg/L; Region beyond middle and lower part, facultative aerobic membrane bioreactor film district is oxygen or the anaerobic environment of holding concurrently, and dissolved oxygen concentration is lower than 0.5mg/L.
In whole system, form the flow location form that is alternately distributed of the aerobic-oxygen-anaerobism of holding concurrently, waste water in facultative aerobic membrane bioreactor can be continuously alternately through the aerobic-oxygen-anaerobic zone of holding concurrently, constantly carry out the Biodegradation and biotransformation of pollutent, principal pollutant (organic loading, ammonia nitrogen and the SS) degraded that strengthened.
Particularly in step 3, crown_interception due to film, in reaction zone, form the active sludge of high density, facultative aerobic membrane bioreactor system activity sludge concentration 15000-20000mg/L, facultative aerobic membrane bioreactor hydraulic detention time is 8-10 hour, mud is in low organic loading running status, and whole facultative aerobic membrane bioreactor can be realized organic excess sludge near zero release.
In step 3, in reactor, form and take amphimicrobe as main particularly, the aerobic bacterium phase morphology coexisting with amphimicrobe is realized Anammox denitrogenation in same facultative aerobic membrane bioreactor.
The present invention is mainly usingd facultative aerobic membrane bioreactor as the main process of processing breeding wastewater, solve the problem that is difficult to qualified discharge after livestock breeding wastewater is processed, simplified technical process simultaneously, reduced construction investment and floor space, improved treatment effect, maintenance of the equipment is simple; Effluent quality can reach < < urban sewage reutilization city miscellaneous water water quality > > (GB/T18920-2002) road-cleaning, fire-fighting, the reuse of greening water water quality standard.
Accompanying drawing explanation
Fig. 1 tradition anaerobism+aerobic biochemical combination treatment process flow sheet.
Fig. 2 process flow diagram of the present invention.
Fig. 3 facultative aerobic membrane bioreactor inside is aerobic-oxygen-anaerobism of holding concurrently be alternately distributed flow location form figure.
Embodiment
Embodiment 1
Treatment scale: 100m
3/ d; Adopt treatment process of the present invention: " pre-treatment (A/O pond)+equalizing tank+facultative aerobic membrane bioreactor ".Livestock breeding wastewater first after pretreatment, enter the equalizing tank regulating water quality water yield, after water quality and quantity regulates, sewage enters facultative aerobic membrane bioreactor, crown_interception due to film, in reaction zone, form the active sludge of high density, concentration is controlled at 15000-20000mg/L, and the reactor waterpower residence time is 10 hours.In facultative aerobic membrane bioreactor, by optimizing aerating system intensity distribution, middle and lower part, film district is aerobic zone, and dissolved oxygen remains on 2-5mg/L; Region beyond middle and lower part, film district is oxygen or the anaerobic environment of holding concurrently, and dissolved oxygen concentration, lower than 0.5mg/L, is answered in device and formed and take amphimicrobe as main, the aerobic bacterium phase morphology coexisting with amphimicrobe.Waste water in reactor alternately through the aerobic-oxygen-anaerobic zone of holding concurrently, constantly carries out the Biodegradation and biotransformation of pollutent continuously, and principal pollutant (organic loading, ammonia nitrogen and the SS) degraded that strengthened realizes Anammox denitrogenation in same reactor.Whole reactor can be realized organic excess sludge near zero release, and effluent quality can reach < < urban sewage reutilization city miscellaneous water water quality > > (GB/T18920-2002) road-cleaning, fire-fighting, the reuse of greening water water quality standard.
table 1 is respectively controlled project discharge value and discharge index comparison sheet