城市污水处理厂提标改造关键技术研究

发布时间：2018-07-10 14:26

本文选题：污水处理厂提标改造 + A/O-NICH强化　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：在系统分析现有污水处理厂存在进水水质中SS含量较高、出水总氮不能达标排放及剩余污泥含水量较高等问题的基础上,通过现场调研与实验、实测相结合的方式,指出了进水SS含量高的原因,提出采用增加平流沉砂池来化预处理,降低出水SS含量,减少其对生物作用的负面影响；通过考察生物硝化与反硝化作用的效果,揭示出水总氮超标的原因,提出减小污泥负荷、延长水力停留时间和增补优势菌种PCN等措施,有效提高生物硝化与反硝化效率,出水总氮实现达标排放；运行相关软件包对进、出水水质参数的相关性进行了分析,揭示了进水BOD_5/TN对出水TN两变量中度负相关,进水BOD_5/TP对出水TP两变量低度负相关,进水BOD_5/COD对出水TP相关程度弱,进水SS/BOD_5对出水TN基本不相关等进水水质与出水水质间的关联性,为污水处理厂的提标改造提供借鉴。对剩余污泥含水量高的原因进行了分析,通过改造脱水设备降低污泥含水率。通过工艺改造后的系统运行分析发现,工艺改造后的各项水质指标均有较大幅度的提升,COD、TN、NH3-N、TP及SS的去除率分别达到84%,30%,94%,76%和95%以上,出水指标均达到《城镇污水处理厂污染物排放标准》GB18918-2002一级A排放标准；污泥含水率在60%以下；且改造后的工艺具有运行稳定,抗冲击负荷的能力。
[Abstract]:On the basis of systematical analysis of the problems of high SS content in influent water quality, high total nitrogen content in effluent and high water content of excess sludge in existing wastewater treatment plants, the method of combining field investigation and experiment with actual measurement is adopted. The reasons for the high SS content in influent were pointed out, and the effect of biological nitrification and denitrification was investigated by adding advection sand tank to pretreatment, reducing SS content in effluent and reducing its negative effect on biological action. In order to improve the efficiency of biological nitrification and denitrification, the effluent total nitrogen can be discharged up to the standard, and the relevant software package should be run in order to improve the efficiency of biological nitrification and denitrification, and put forward the measures of reducing the sludge load, prolonging the hydraulic retention time and supplementing the dominant strain PCN. The correlation of effluent water quality parameters is analyzed. It is revealed that influent BOD5 / TN has moderate negative correlation with effluent TN, influent BOD5 / TP has low negative correlation with effluent TP, influent BOD5 / COD has weak correlation with effluent TP. The relationship between influent water quality and effluent quality is basically irrelevant to effluent TN by SS- / BOD5, which can be used as a reference for upgrading and upgrading of wastewater treatment plant. The reasons for the high water content of excess sludge were analyzed, and the sludge moisture content was reduced by revamping dewatering equipment. Through the analysis of the system operation after the process transformation, it is found that the removal rates of COD, TNN, NH _ 3-NU _ (TP) and SS are over 84% and 95%, respectively. The effluent indexes are all up to the first class A discharge standard of GB18918-2002, the sludge moisture content is below 60%, and the modified process has the ability of running stably and resisting shock load.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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