含盐污水SBR法生物脱氮模糊控制参数

为考察含盐污水SBR法生物脱氮实现模糊控制的可行性和有效性，以实际含盐生活污水作为研究对象，考察了脱氮过程DO、pH变化规律以及盐度冲击下pH的变化规律。结果表明含盐污水SBR法脱氮过程DO曲线变化不规律，应采用pH值为模糊控制参数。不同盐度下pH曲线有相似规律，曲线上出现的反映生物脱氮进程特征点：跃升点a（break point）、氨氮谷点b (ammonia valley)、硝酸盐峰c（nitrate apex）与有机物降解结束、硝化完成和反硝化完成有很好的对应关系;盐度升高后a、b推后出现;10 g•L^-1系统受盐度冲击时pH曲线依然遵从变化规律，但随着冲击盐度的升高特征点出现位置有所变化。冲击盐度高于30 g•L^-1，pH曲线逐渐趋于平缓，特征点a、b不明显但延长曝气时间时能够出现， c点受影响较小。

Fuzzy-control parameters for nitrogen removal of saline sewage in SBR process

In order to investigate the feasibility and validity of using fuzzy-control strategy for nitrogen removal of saline sewage in the sequence batch reactor (SBR) process, the real saline sewage was treated firstly in this experiment and the variation patterns of dissolved oxygen (DO) and pH value during the removal of organic matter, nitrification and denitrification were studied in detail with fresh sewage and saline sewage at salinity 10 g•L^-1, 20 g•L^-1, 35 g•L^-1 during steady state and salinity shock periods.The results showed that the characteristic points and platforms of pH value detected in saline sewage were repeated very well and had the same regularity but DO curve changed a lot with different regularities .The characteristic points a (break point), b (ammonia valley), c（nitrate apex）could indicate the completion of organic matter degradation, nitrification and denitrification.Points a and b would appear late in the sewage with a high salinity.During the salinity shock periods, the pH value also changed with the same regularity though the characteristic points appeared in different times.However, when the salinity was above 30 g•L^-1 the pH curve became flat.Points a and b would not appear until the aeration time was prolonged but c was influenced little.Because during the shock periods the nitrification oxidation bacteria were inhibited at first, then were ammonia oxidation bacteria, and the denitrification bacteria were inhibited at last.pH should be used as the fuzzy-control parameter for nitrogen removal of saline sewage in sequence batch reactor (SBR) process.