改良型AAO工艺在城市污水处理厂中的应用研究

发布时间：2019-04-12 07:41

【摘要】：本文以西安市第五污水处理厂改良A2/O工艺实际运行工况为研究对象,通过对该厂提标改造前后一年多实际运行监测数据分析研究,得到了实际进水量总变化系数、提标改造前后污泥产量与耗电量变化情况;分析了该工艺对污水中主要污染物的去除效果,结果表明:COD、BOD5、TN、NH4+-N、和SS的去除率分别达到95.60%、97.10%、74.63%、97.49%、89.80%和98.00%以上,且工艺运行稳定,具有较强的抗冲击能力和稳定的出水水质。同时,分析了运行中TP去除率不稳定的主要原因是生化处理系统厌氧区环境差、污泥龄长、回流污泥浓缩液中氮和磷含量较高等因素,提出了降低外回流量、增大内回流量,调整污泥龄,适时调节曝气量等工艺运行参数的改进措施。并选择了几种常见的化学絮凝剂进行了化学除磷试验研究,为今后该厂辅助化学除磷装置运行选择适合的药剂和投加量提供理论依据。针对该污水处理厂实际运行中二沉池污泥上浮现象,分析了产生污泥上浮的原因以及相应的应对措施,为污水处理厂的实际运行管理提供技术支持。通过对卵形污泥消化池的启动调试过程分析研究,总结了污泥消化池调试运行的主要步骤和监测分析指标,测试了调试过程中卵形消化池的主要运行数据,CH4含量在55%~70%之间,CO2含量为28%~36%,O2含量保持在1%左右。并针对调试运行期间出现的问题提出了解决方案,所得结论可供其他类似污水处理厂污泥消化系统设计和运行管理时参考。
[Abstract]:In this paper, the actual operation condition of the modified A _ 2 O process in Xi'an No. 5 sewage treatment Plant is taken as the research object. Through the analysis and study of the monitoring data of more than one year before and after the standard raising of the plant, the total variation coefficient of the actual water intake is obtained. The change of sludge output and electricity consumption before and after standard raising; The results show that the removal rates of COD,BOD5,TN,NH4-N and SS are 95.60%, 97.10%, 74.63%, 97.49%, respectively, and the removal efficiency of the process is 95.6%, 97.10%, 74.63%, 97.49%, respectively. The process is more than 89.80% and 98.00%, and the process is stable, with strong shock resistance and stable effluent quality. At the same time, the main reasons of unstable removal rate of TP in operation are bad environment in anaerobic zone of biochemical treatment system, long sludge age, high nitrogen and phosphorus content in refluxing sludge concentrate, and so on. It is proposed to reduce external return flow and increase internal return flow. Adjustment of sludge age, timely adjustment of aeration and other technical parameters of improvement measures. Several common chemical flocculants were selected to carry out the experimental study of chemical phosphorus removal, which provided the theoretical basis for the selection of suitable chemicals and dosages for the operation of the auxiliary chemical phosphorus removal plant in this plant in the future. In view of the phenomenon of sludge floating in the secondary sedimentation tank in the actual operation of the sewage treatment plant, the reasons for the sludge floating and the corresponding countermeasures are analyzed, which provide technical support for the actual operation and management of the sewage treatment plant. Through the analysis and research on the start-up and debugging process of the egg-shaped sludge digester, the main steps and monitoring and analysis indexes of the sludge digestion tank were summarized, and the main operation data of the egg-shaped digester in the debugging process were tested. The content of CH4 was between 55% and 70%, the content of CO2 was 28% and 36%, and the content of O2 was about 1%. The solutions to the problems occurred during commissioning and operation are put forward, and the conclusions can be used for reference in the design and operation management of sludge digestion system in other similar sewage treatment plants.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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