摘要：

以生活污水为研究对象，采用厌氧—缺氧—氧化沟工艺对氧化沟的除磷性能进行了研究，结果发现：(1)该工艺具有较好的除磷效率，稳定阶段TP去除率能够达到90%，出水TP平均为0.62mg/L。(2)序批式试验中前30min磷的释放速度很快，单位MLSS的释磷速率为10.75mg/(g·h)，而在30~120min磷释放速率很低，为0.48mg/(g·h)。(3)出水TP的浓度与出水NO3-有较好的相关关系。(4)该工艺进水COD为340.4mg/L时，出水COD为50.7mg/L，COD去除率为84.5%；大量COD在厌氧区转化为聚磷菌胞内聚合物而去除，这部分胞内聚合物能够在缺氧区充当电子受体被二次利用。

关键词: 污水处理, 生物除磷, 氧化沟

Abstract:

In order to study the issue of biological phosphorus removal, domestic sewage has been studies by using anaerobic-anoxic-oxidation ditch process.The conclusion indicates that:(1)The process has good phosphorus re- moval efficiency.In the stable stage the average total phosphorus(TP)removal efficiencyis 90%, and the average ef- fluent TP concentration is 0.62 mg/L.(2)In the first 30 min ofthe sequence batch anaerobic phosphorus release test, the velocity of phosphorus release is very fast, and the specific phosphorus release rate is 10.75 mg/(g·h), but after 30-120 min the velocity of phosphorus release becomes very slow, i.e.0.48 mg/(g·h).(3)There is a good relation between the effluent TP and nitrate.(4)The process has good CODremoval efficiencyand stability.The influent and effluent COD are 340.4 and 50.7 mg/L respectively, and the average COD removal efficiency is 84.5%.Most of the influent COD is removed in the anaerobic zone, and turned into polymer of the phosphorus accumulation bacteria, then the polymer could be used and regarded as the electronic acceptor in the anaerobic zone the second time.

Key words: wastewater water treatment, biological phosphorus removal, oxidation ditch

中图分类号: 

• X703.1