| With the rapid development of industry, industrial waste water discharge is increasing.High concentration of organic pollutants in industrial waste water and a lot of water eutrophication matters(ammonia nitrogen) make industrial waste water a great harm to the ecological environment. Therefore, it is urgent to develop efficient and cheap high Organic loading industrial waste water treatment process with high ammonia and nitrogen. This paper intends to carry out experimental research on Simulated industrial waste water with high ammonia nitrogen and organic loading with Packed type F-CASS combined process, play its advantages of F-CASS stable operation and low price of the membrane module (non-woven fabric), at the same time, strengthen its biological treatment efficiency by adding fillers.Through the start-up and operation of packed type F-CASS reactor system,its removal efficiency of CODcr, ammonia nitrogen) pollutants in the Simulated industrial waste water was studied and the optimum operating conditions of the system were investigated. In addition, the biological community of the reactor was monitored and analyzed to explore its composition and distribution.The activated sludge in the packed type F-CASS reactor was cultivated and acclimatized through Inoculation sludge culture method. After 24 days,the reactor system was into stable operation stage. CODcr of inflow was reduced from 850mg/L to 15mg/L and the removal rate of CODCr reached 98.2%, Ammonia nitrogen of inflow were reduced from 80mg/L to 18mg/L and the removal rate of ammonia nitrogen reached 77.5%. For the Filamentous sludge expansion happening in the Packed type F-CASS process, 30% 0.5?gL/L hydrogen peroxide solution was added to effectively kill the filamentous bacteria in reactor and, at the same time,90mg/L polyaluminum chloride was added to increase the sludge settle ability, which can rapidly control sludge expansion. After 7 days, the reactor system recovered normal operation.The effects of hydraulic retention time, aeration time and drainage ratio on the removal efficiency of F-CASS process for high Organic loading industrial waste water treatment process with high ammonia nitrogen were investigated. With the increase of hydraulic retention time, the removal efficiency of CODCr was gradually enhanced, and the removal efficiency of ammonia and nitrogen was best when the hydraulic retention time was 8h; The removal rate of CODCr,ammonia nitrogen was in direct proportion to the length of aeration time, but the difference of removal rate was small when the aeration time was 4H and 5h, The removal efficiency of the reactor decreased with the increase of the drainage ratio through through the study of drainage ratio. The reactor system runs in the best condition when the aeration time is 4h, drainage ratio of 1:3 and hydraulic residence time is 8h by central composite design and response surface analysis method. At that time, CODCr, ammonia nitrogen, total nitrogen and total phosphorus of inflow were reduced from 823.56mg/L,79.02mg/L, 84.03mg/L and 6.07mg/L to 9.82mg/L, 14.63mg/L, 19.21mg/L and 0.70mg/L;Removal rates were as high as 98.79%, 81.69%, 77.14% and 88.56%.Biological communities of sludge in filler and the main reaction zone were tested respectively, the result showed:The community richness of activated sludge in the reactor is higher than that of the activated sludge in filler. The dominant species of activated sludge in the reactor is the nitrification bacteria while the dominant species in the filler is the denitrification bacteria. Sludge community distribution structure of filler is that the nitrification bacteria is attached to Filler surface, while the denitrification bacteria is mainly Inside the filler. The whole filler forms a surface aerobic but internal anaerobic environment which plays a key role in removing ammonia nitrogen; The long-term internal anaerobic condition cultivates some of the denitrification phosphorus accumulating bacteria which play a role in the removal of phosphorus. |
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