某城市污水厂运行中出现的问题及解决办法探讨

某城市污水处理厂采用改良氧化沟工艺处理生活污水,在运行中存在脱氮除磷效果不佳的问题。通过对该厂的工艺流程及进、出水水质情况等分析,结果表明:TN、TP去除率低的主要原因是进水有机物浓度与设计值相比偏低,氧化沟内很难形成设计时所设想的好氧/缺氧交替运行的环境以满足氮、磷的去除。因此,尽快完善污水收集系统,使城市污水处理厂进水水质达到设计要求是提高氮、磷去除效率的关键。在工艺中可适当减少曝气量来提高TN去除率,降低出水中的硝态氮和溶解氧,同时进一步提高TP去除率。

DISCUSSION ON PROBLEMS IN OPERATION AND SOLUTIONS OF A MUNICIPAL SEWAGE PLANT

The efficiency of nutrient removal was poor in operation of modified Carrousel oxidation ditch used in a WWTP.By analyzing the process,the influent and effluent quality and operation parameters,the results showed that TN and TP removal rate was low mainly due to the influent lower concentration of organic matter compared to the design value and the oxidation ditch was difficult to form a designed environment of the aerobic/anoxic alternating running to meet the needs of nitrogen and phosphorous removal.Therefore,enhanceing the sewerage system as soon as possible to make the urban sewage treatment plant influent water quality meet the design requirements was the key point to improve the nitrogen and phosphorus removal efficiency.The appropriate reduction of the amount of aeration in the process could improve the TN removal efficiency and reduce nitrate and dissolved oxygen,the TP removal efficiency could improve at the same time.