The Study On The Control Factors Of Design And Operation In Activated-sludge Process

This paper detaily discussed the technical principle of activated-sludge process and the reaction mechanism of biological nitrogen and phosphorus removal in anaerobic period,anoxic period and aerobic period. According to the data gained from the HuPo country villa sewage-treatment works in HeFei,the paper tried to seek the optimal control factors of design and operation in activated-sludge process.Based on the statistic data (1995-2001) from the operation of the HuPo country villa sewage-treatment works,it could gain the following conclusion:the abnormal phenomena,such as sludge expansion,rising sludge and foam,which accurred was closely related with F/M,DO,MLSS,SRT and circumfluent sludge concentration. Besides,atmosphere temperatu,water temperature and alternative change of atmosphere pressure played important roles on normal operation of sewage-treatment works. Moreover,the vice in the design of technical flow was also the factor which caused the abnormal phenomena.The study of this thesis can offer some worthy methods in sewage treatment in our country. It's importance mainly lies in these sides:instucting the function and debugging of the sewage treatment factory using Activated-sludge Process;considering the situation of China,decreasing the devoted fund,reducing running expenditure;providing the rebuilding direction about the removal ability of biological nitrogen and phosphorus for sewage-treatment works.