A2/O工艺脱氮除磷运行效果分析

采用统计学方法对新疆某污水处理厂A2/O工艺进行进水水质数据分析，发现数据存在严重自相关现象，运用主成分消除法和岭回归消除法以消除自相关性。结果表明：TN和TP是污水厂提标改造的关键；碳源匮乏和缺氧区存在溶解氧(DO)是TN去除不佳的主要原因；适当提高污泥浓度(MLSS)和水力停留时间(HRT)是强化TP去除的措施；温度是影响脱氮除磷的主要因素。将温度模型与自相关磷模型相结合，可提高磷模型精度，有利于出水TP的预测。降低DO、增加外碳源，控制MLSS为3 500 mg/L~4 500 mg/L、HRT为5.4 h~8.0 h、厌氧区和好氧区DO为0.3 mg/L和2 mg/L、污泥龄（SRT）为11 d~12 d，可提升工艺脱氮除磷效果。

Operation Effect Analysis of Nitrogen and Phosphorus Removal in A2/O Process

Statistical method was used to analyze the inlet water quality data of A2/O process of a sewage treatment plant in Xinjiang, and it was found that there was a serious autocorrelation phenomenon in the data. Principal component elimination method and ridge regression elimination method were used to eliminate the autocorrelation. The results showed that TN and TP were the key to the upgrading and reconstruction of sewage plant. The lack of carbon source and the existence of dissolved oxygen (DO) in anoxic zone were the main reasons for poor TN removal. Properly increasing sludge concentration (MLSS) and hydraulic retention time (HRT) were the measures to strengthen TP removal. Temperature was the main factor affecting nitrogen and phosphorus removal. Combining temperature model with autocorrelation phosphorus model could improve the accuracy of phosphorus model, and was beneficial to the prediction of TP in effluent water. Reducing DO, increasing external carbon sources, controlling MLSS to 3 500 mg/L~4 500 mg/L, HRT to 5.4 h~8.0 h, DO to 0.3 mg/L in anaerobic zone and 2 mg/L in aerobic zone, SRT to 11 d~12 d, could improve the effect of nitrogen and phosphorus removal.