Screening And Application Of Suitable Cold Bacteria For Low Temperature Sewage Treatment In Cold Areas

Sewage treatment plants in most of the urban areas in China in the treatment of domestic sewage,generally USES is the A/O and A₂/O or oxidation ditch process,but when the temperature is below 10℃,the processing effect will be affected by large,how to guarantee the efficient treatment of wastewater under different temperature conditions has important research significance.In this study,the campus sewage was selected as the simulated water,and the three plants were selected for the high efficiency degradation bacteria in the low temperature environment.The growth characteristics and degradation characteristics of high efficiency and suitable cold bacteria in low temperature environment were investigated.Using the low temperature sewage treatment efficient bacteria quick start anaerobic-aerobic biofilm reactor,anaerobic-aerobic biofilm reactor as the backing,optimizing reactor operating conditions,makes a research on the optimal cold bacteria biological strengthening the role of biofilm reactor processing efficiency.On this basis,A/O biological membrane reactor nitrifying liquid reflux process is constructed to achieve the discharge of sewage standard.A/O biological membrane reactor nitrifying liquid recirculation process is activated rapidly,and the COD removal efficiency of anaerobic biofilm reactor reaches over 75%.Water retention time（HRT）affects the contact time of sewage and biofilm,thus affecting the effluent quality of effluent.The water retention time is 36 h,the reflux ratio is 1,and the sewage discharge is fully qualified.The research on the treatment of low temperature water wastewater is of practical significance.