Study And Application On The Technology Of Swine Wastewater Treatment

Swine wastewater is a high concentration organic wastewater, the BOD5/COD≥0.4, which contain ample nutrients such as N,P and so on. The swine wastewater is is very suitable for biological treatment. Base on the 10000 swine wastewater treatment project in Dongxiang Fuzhou city Jiangxi province, A combination of technology of precipitation + anoxic + UASB + coagulation +BIOFOR process was used to treat the wastewater. According to the result of the project start debugging and operating characteristics, the research results were showed as follows:1. Anoxic reactor not only can regulate water quality and quantity, but also have the effection of acidification and denitrification, which have effective degradationantibiotics to toxic substances such as antibiotic. It benefit to latter biochemical treatment. Under normal circumstances, Anoxic reactor had 98.65% average NO3--N removal efficiency.2. Anaerobic digester sludge was used to seed in the UASB reactor. The reactor can start-up in 44days on the condition of 20 kgVSS/mJ seed sludge concentration and using intermittently influent mode. On the dynamics study of startup procedure, K value can reach the target Ko value in 42th days. Under normal circumstances, UASB had 80% average COD removal efficiency, the effluent COD was about 310-900 mg/L. the fitted curve slope of the K trend is 0.0119. The kinetic model is v=ds/dt=(13.42QSi/V)/(17.82+QSi/V).3.BAF start-up by generation biofilm in nature with effluent water backflow, which had 42.9% average COD removal efficiency and 67% NH4+-N removal efficiency and 74.3% SS removal efficiency.4. The effluent COD is 275mg/L, average removal rate achieve 97.4%, The effluent NH3-N is 73.3mg/L, average removal rate achieve 82.2%, The effluent SS is 24.5mg/L, average removal rate achieve 99.3%.The effluent quality can reach the《emission standards of livestock and poultry breeding》5. The project cost about 133.4 million yuan in all. The running cost was about 2.421 yuan per cubic miter without equipment depreciation.it has huge environmental benefits.