DO对A/O一体式复合池生物除磷性能的影响

Effect of Dissolved Oxygen on Phosphorus Removal Process of the Integrated Anoxic/Oxic Compound Pool

通过考察太原经济开发区污水厂运行情况,分析了该厂A/O一体式复合池的生物除磷性能及溶解氧对生物除磷的影响。结果表明:在进水TP月平均浓度为3.06 mg/L～9.86 mg/L的条件下,复合池对TP的平均去除率为38.22%,高于一般活性污泥法20%～30%的去除率,但出水TP月平均浓度为1.67 mg/L～5.54 mg/L,要实现一级A排放标准还需深度单元作补充处理;控制缺氧段DO为0.2 mg/L～0.5 mg/L、好氧段DO为2 mg/L时,可以兼顾同步脱氮除磷的需求。

In order to make the integrated anoxic/oxic compound pool with biological contact oxidation process as the main body used for small towns sewage treatment more reasonably and widely,the process of biological phosphorus removal and the effect of dissolved oxygen on phosphorus removal process of the integrated anoxic/oxic compound pool were analyzed by investigating the operation condition of Taiyuan economic development zone sewage treatment plant. The results showed that, the monthly average removal rate of total phosphorus （TP） was 38.22% at a influent TP monthly average content of 3.06-9.86mg/L, and was higher than the removal rate （20-30%） of the conventional activated sludge process.The monthly average mass concentration of TP in the effluent was 1.67-5.54mg/L,thus advanced treatment should be taken for the effluent quality meet the first class of A standard. Both the simultaneous nitrogen and phosphorus removal can be given consideration to, when DO is 0.2-0.5mg/L, at the anoxic phase and DO is 2.0 mg/L, at the aerobic phase.