Study On Treatment Of The High Concentration Industry Of Fine Chemical Waste Water By Anaerobic Baffled Reactor

ABR (Anaerobic Baffled Reactor), the biggest feature of the reactor is set next baffled in the direction of flow - turn into a series of chambers so that the microbial populations along the length direction of achieving different compartment acid production and the production of methane phase separation. The reactor is simple in structure, a strong ability to retain sludge, treatment system stability, facilitate the operation and management advantages. Currently, at home and abroad on ABR reactor research and has been more reported in the literature. But to deal with the high concentration of refractory wastewater fine chemicals, in particular the practical application there is a lack of in-depth and systematic research, more a lack of engineering design and engineering debugging data.In this paper, a chemical industry enterprises in Jiangsu for the production of wastewater is studied as object, we had been in progress ABR dealing with the high concentration of fine chemical wastewater laboratory research, engineering design and engineering debugging works. Priority has studied ABR reactor starting, activated discussion of the degradation of COD and volume load, influent concentration, HRT, alkalinity, volatile acid, pH right degradation of pollutants; all of the sludge compartment different stages of the operation characteristics; meanwhile the chemical raw water for the anaerobic toxicity tests confirmed the presence of toxic size and toxicity. The research results showed:①In the upper compartment added flexibility fiber filler, which can effectively prevent the loss of sludge, played intercepting pollution and increasing efficiency.②ABR to the chemical company sewage plant anaerobic sludge and sludge mixed laboratory hypoxia-like sludge as inoculation sludge, can be achieved with the rapid inoculation. Against the properties of waste-water, recommended low-load starting, commencement of the influent concentration control in 1500~2000mg/L, study found that the sludge concentration of 20g/L , temperature of 35±2°C, HRT for 48 hours ,under this conditions, the ABR reactor started faster; gradually to not more than 30% increase COD, after about 7-8 weeks to complete practice sludge domestication, stable COD removal efficiency of about 50%.③In fixed HRT for 48 hours, temperature of 35±2℃,COD degradation rate stabilized at around 50%. Go a step further research ABR classification compartment of the ability to remove organics found that the different compartments of the removal of organic matter with different abilities: No.1 compartment removed about 5.2%, No.2 compartment about 5.2%, No.3 compartment of about 16.6% ,No. 4 compartment by about 25%.Changing HRT and changing in the influent COD concentration of volume load test showed that ABR experimental chemical wastewater, HRT 48h was to be better.Load Control recommendations in 1.5~3.8 kgCOD/ (m3 ? d), should not exceed 4.0 kgCOD/ (m3 ? d).④Test results showed entered ABR reactor t COD concentration should not exceed 8000mg/L, 5000~7000mg/L suitable control. At this time, the wastewater is a good activity of anaerobic biological treatment, ABR reactor can form a good grade anaerobic bacterial communities : in the NO.1 compartment the bacillus occupies the superiority and the sludge interspersed with a filamentous fungus; in the NO.2 compartment the coccus occupies the superiority, and also has large number of bacilli; in the NO.3 compartment of fungus and bacilli; in the NO.4 compartment main Contain fungus and bacilli. Study found that 1,2-class compartment of the hydrolysis acidification will lead to over-acidification, affecting system operation. To prevent over-acidification, adding the necessary alkalinity can effectively reduce the excessive accumulation of VFA. adding about 2000mg/L.⑤Wastewater toxicity tests proved the existence of toxic wastewater, with inhibition of biological, and the concentration of 4520mg/L system methanogenic activity dropped to 50%. Therefore, the original workshop process wastewater should not directly enter the ABR plant, ABR in front it was necessary to set up Fe/C micro-electrolysis pretreatment , to a certain degradation of the toxicity and improve biodegradability.⑥ABR structure design refers to achievements and hydraulic loading surface q from 2.0 m3/ (m2 ? h), up-flow compartment from 1.8m wide, down-flow compartment from 1.4m wide, baffled angle of 45 o, baffled 50cm from the bottom. Operating parameters based on test data, the design flow of the bench, HRT for 72 hours. COD control 5000~7000mg/L. Otherwise, not more than 8000mg/L will show significant toxicity.⑦During debugging, using secondary adding anaerobic sludge to vaccine inoculation, 100t each adding moisture content of 80% of the anaerobic sludge digestion, dosing interval of two months. Due to the early stage of the system is not operating at full capacity, there will be sludge settlement, therefore increase temporary sewage return and use nitrogen stripping sludge. monthly. Influent add trace elements, because the sewage return and the effective control of the flooded pH6.5~7.5,adding sodium bicarbonate alkalinity 1000mg/L, during the commissioning VFA didn't emerge accumulation. The chemical of raw water Without pretreatment reached COD 4000mg/L that show obvious toxicity, system fluctuated significantly ,at this time must start the Fe/C micro-electrolysis pretreatment system.