【摘要】 利用反硝化聚磷菌进行动态与静态相结合的反硝化聚磷试验,研究A2/O厌氧段聚磷菌的反硝化聚磷特性。研究结果表明,在A2/O厌氧段中占聚磷菌总数52%的菌具有同步反硝化聚磷的生物学特性。当以NO 3--N作电子受体进行聚磷时,其硝酸盐浓度应限制在50 mg/L以下,初始硝酸盐浓度越高,反硝化速率和缺氧聚磷速率及去除率越快,系统由聚磷转变为释磷的时间将延后。由于释/聚磷过程都需要碳源,所以,应控制进水的化学耗氧量(COD),以200 mg/L为最佳,使在释磷时有充足的碳源而在聚磷时碳源又较少。pH值对释/聚磷有不同程度的影响,在一定范围内,初始pH值越高,释磷效果越好,但当pH≥8.0时,会引起磷酸盐沉积而导致磷酸根浓度降低,从而无法正确判断释磷和生物聚磷效果,反硝化除磷系统的pH值应控制在7.0~7.5的范围内。更多还原

【Abstract】 With the denitrifying phosphorus accumulation bacteria(DPB) from sludge at the A2/O anaerobic stage,the static and dynamic denitrifying phosphorus accumulation experiments were carried out.The results show that the anaerobic sludge from A2/O technology has 52% phosphorus accumulating organisms bearing denitrifying and removing phosphorus.During the removing phosphorus process,the concentration of nitrate which is used as electronic acceptor should be lower than 50 mg/L.The higher the initial concentration of nitrate is,the higher the denitrifying and anoxic phosphorus accumulation rate and removal efficiency are.And the time for the system changing from the accumulating phosphorus state to releasing phosphorus state is delayed.The chemical oxygen demand(COD) must be controlled because of the competition between anaerobic and anoxic process,the best is 200 mg/L;pH value has different effects on the anaerobic and anoxic stage.When the initial pH value is higher in a certain range,the releasing phosphorus is accelerated,but phosphate is deposited when pH value is above 8.0 and then the biological phosphate removal is disturbed,which suggests that the pH value should be controlled in the rang of 7.0?7.5 for the denitrifying and removing phosphorus system.更多还原