【作者】 任明华；

【导师】 高乃云； 严敏；

【作者基本信息】 同济大学 ， 市政工程， 2007， 硕士

【摘要】 随着水体“富营养化”问题的日益突出，国家对污水排放标准的不断提高，污水处理技术逐渐从以单一去除有机污物为目的的阶段进入到既要去除有机物又要进行脱氮除磷的深度处理阶段，对具有脱氮除磷功能的污水处理新工艺的应用与研发已成为当今污水处理领域关注的热点。CAST工艺（Cyclic Activated Sludge Technology）是一种较为新颖的具有脱氮除磷功能的污水处理工艺，由于其占地面积小、无需初沉池和二沉池、基建及运行费用低、不易发生污泥膨胀、操作管理方便等诸多优点，近年来在我国已得到越来越多的应用，具有广阔的市场前景。 为了促进CAST工艺的研究发展，尤其是在处理城市生活污水中的应用，本课题以镇江市征润州污水处理厂的实际生产工艺流程为试验现场，开展了一系列生产性试验研究，全面考察了CAST工艺的工作性能，尤以CAST工艺对氮磷的去除效果为考察重点，考察了不同运行工况对工艺运行效果的影响，并在此基础上提出了工艺的最优化控制参数。同时结合静态试验，对CAST工艺污泥的硝化及反硝化性能进行了研究。 镇江市征润州污水处理厂的CAST工艺具有稳定良好的去除有机物及除磷效果，根据实验得出的结果，当运行工况：MLSS为3500～4500mg／L，周期为4h，进水曝气阶段DO为0～0.5mg／L，纯曝气阶段DO为2～3mg／L，COD容积负荷为0.3～0.8kg／（m³·d），SRT为8～12d，水温为15～21℃时，TP平均去除率为82.2％，出水TP平均值为0.25mg／L；NH₃-N平均去除率为28.6％，出水NH₃-N平均值为14.61mg／L；TN平均去除率为20.7％，出水TN平均值为18.16mg／L。 在冬季低温条件下比较了4h和3h两种不同周期对CAST工艺的影响和作用，试验结果表明，CAST工艺采用两种不同的周期对碳、氮和磷的去除效果基本接近，3h周期对COD、NH₃-N和TP的去除率分别为88％、89％和31％；4h周期为82％、88％和33％，在冬季低温条件下采用短周期完全可行。 进行了最佳DO浓度试验，试验结果表明，对目前的进水水质，将CAST工艺纯曝气段的DO浓度稳定控制在2.5mg／L左右，能使CAST工艺的工作性能达到最佳，COD、TN和TP去除率分别可达到85.9％、25.9％和84.5％，出水更多还原

【Abstract】 With the severe eutrophication question occurred, the standard of wastewater discharge was controlled more strictly. Therefore, the wastewater techniques developed gradually from the period of pure COD removal to the period of simultaneous COD, nitrogen and phosphorus removal. The application and investigation development of the new wastewater treatment process with the function of nitrogen and phosphorus removal has been the study focus. CAST process is a novel wastewater treatment process with the function of nitrogen and phosphorus removal, which has been applied more and more often these years and has a broad marketing prospect in our country, due to many merits such as little floor space, no need for preliminary and secondary sedimentation tanks, low cost of capital construction and operation, preventing sludge bulking effectively and convenient operation and management.To promote the investigation development of CAST process, especially the application in municipal sewage treatment, a series of production tests were carried out. Zhenjiang Zhengrunzhou sewage plant as the experimental field, the performance of CAST process was studied roundly. Study emphases was put on N and P removal of CAST. Based on studying the influence on operation effect of different operation conditions, the optimum controls parameters were put forward. In the meantime, the performance of nitrification and denitrification of CAST sludge was studied through static test.The CAST process of Zhenjiang Zhenrunzhou sewage plant has an stably excellent effect on the removal of organic matter and phosphorus. According to the experimental result, when MLSS was 3500 ～ 4500mg/L, cycle was 4h, DO concentration was 0～0.5 mg/L in influx/aeration phase and 2～3 mg/L in aeration phase, COD load was 0.3～0.8kg/（m³d）, SRT was 8～12d and water temperature was 15～21°C, the mean removal efficiencies of TP, NH₃-N and TN were 82.2%, 28.6% and 20.7% respectively; mean concentration of TP, NH₃-N and TN in effluent were 0.25,14.61 and 18.16mg/L respectively.更多还原