考察2种工艺处理较高ρ(COD)/ρ(TN)(简写为C/N)生活污水时的污泥沉降性,系统在污水C/N比为7.1左右的情况下,稳定运行30 d.实验结果表明:A2O-BAF工艺的沉降性远远好于普通A2O工艺,前者无污泥膨胀之虞,而后者比较严重,主要原因为:A2O-BAF工艺缺氧段长,好氧段短,能有效抑制丝状菌性膨胀；A2O-BAF 工艺污泥含磷量是普通A2O工艺的2倍多,前者为6％左右,而后者为3％左右,前者污泥密度高；A2O-BAF工艺面临的污泥上浮问题远不如普通A2O工艺严重,絮体更实,凝聚性更强.%A2O process is an effective nitrogen and phosphorus removal process. A2O-BAF process is a new nitrogen and phosphorus removal process based on the two sludge theories. Separation of activated sludge is one of the difficult problems encountered in the activated sludge process. Sludge bulking is the most difficult problem. The experiment put great emphasis on the sludge settleability of the two processes, when they are used to treat the higher C/N ratio domestic sewage. The two systems were operated for 30 d at the C/N ratio of about 7.1. The experiment result shows that the sludge settleability of A2O-BAF process is far better than A2O process, the former is without the risk of sludge bulking, while the latter is more serious. The main reasons are that A2O-BAF process has long anoxic zone and short oxic zone, so it can inhibit sludge bulking effectively; phosphorus content in sludge of A2O-BAF process is twice more than that of A2O process, the former's is about 6%, and the latter's is about 3%; the floating sludge problem occurring in the A2O-BAF process is far less serious than A2O process does, and the floe is more dense and more cohesive.
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