小型城镇污水处理厂提标难点分析及改造方案优化研究
发布时间：2018-11-08 19:26
【摘要】：为深入实施省委、省政府“五水共治、治污先行”的决策部署,进一步加强浙江省水环境治理,全面改善水环境,加快推进转型升级,2014年4月30日,浙江省环境保护厅发布《浙江省治污水(2014-2017年)实施方案》,方案中指出“坚持‘一厂一策’,加快推进城镇污水处理厂提标改造,对所有出水水质达不到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准的污水处理厂实行提标改造。”浙江省临安市某镇污水处理厂设计规模为5000吨/天,采用“格栅+沉砂池+初沉池+A2O-SBR+标准排放井”处理工艺,设计出水水质执行《城镇污水处理厂污染物排放标准》一级B标准。运营期间,实际处理负荷率67-92%,实际进水水质基本小于设计值,实际出水COD、BOD5达到一级A标准；实际出水SS、TN、TP虽基本达到原设计的一级B标准,但是未达到一级A标准；原工程无尾水消毒装置,因此,TN、TP、SS的去除和尾水消毒是本次提标改造的重点和难点。本文通过对污水处理厂现状、运营情况和难点进行分析研究,校核原设计工艺流程、构筑物设计、设备选型等参数,分析提标难点,提出相应的解决措施。通过设置悬挂式PVA多相聚合物生物填料,强化生化处理能力,实现不停水停机提高脱氮效率；在生化池后增加深度处理工艺——混凝砂滤池,采用硫酸铝作为絮凝剂,PAM作为助凝剂,强化除磷和除SS能力；用紫外线消毒去除尾水中微生物污染,从而使得最终出水的TN、TP、SS、粪大肠杆菌等指标均可稳定达到一级A排放标准的要求。污水处理厂提标改造,使受纳水体水质得到改善,污染物的年排放量得到削减,污染物COD、BOD5、SS的年排放量均减少18.25吨,NH3-N为5.48吨,TN为9.13吨,TP为0.91吨。总投资443.75万元,吨水单位投资887.50元,改造部分新增运行成本0.103元/吨水,改造后总运行成本0.803元/吨水。
[Abstract]:In order to implement the decision plan of the provincial party committee and the provincial government "five water management, pollution control first", to further strengthen the water environment management in Zhejiang Province, to improve the water environment in an all-round way, and to speed up the transformation and upgrading. On April 30, 2014, The Environmental Protection Department of Zhejiang Province issued the implementation Plan for sewage treatment in Zhejiang Province (2014-2017), in which it was pointed out that "adhere to the 'one plant, one policy' policy, and speed up the upgrading of municipal sewage treatment plants." For all sewage treatment plants whose effluent quality is not up to the first class A standard of GB18918-2002, the upgrading of standards is carried out. " The design scale of a town sewage treatment plant in Linan City of Zhejiang Province is 5000 tons / day. The treatment process of "A2O-SBR standard discharge well for primary settling tank of grid sand sink" is adopted. The effluent quality was designed according to the first class B standard of pollutant discharge standard for urban sewage treatment plant. During operation, the actual treatment load rate is 67-92, the actual influent quality is basically smaller than the designed value, and the actual effluent COD,BOD5 reaches the first class A standard. Although the actual effluent SS,TN,TP basically reached the primary B standard of the original design, it did not meet the first class A standard. There is no tailings disinfection device in the original project. Therefore, the removal of TN,TP,SS and the disinfection of the tail water are the key points and difficulties in the upgrading of the standard. In this paper, the present situation, operation situation and difficulties of sewage treatment plant are analyzed and studied, and the parameters of original design process, structure design and equipment selection are checked, and the difficulties of standard raising are analyzed and the corresponding solving measures are put forward. By setting the suspended PVA multiphase polymer biofilm to enhance the biochemical treatment ability, the efficiency of denitrification can be improved without stopping water and stopping. The advanced treatment process, coagulation sand filter, was added behind the biochemical tank. Aluminum sulfate was used as flocculant and PAM as coagulant aid to strengthen the ability of phosphorus removal and SS removal. The microorganism contamination in tail water was removed by ultraviolet disinfection, so that the TN,TP,SS, fecal Escherichia coli in the final effluent could meet the requirement of the first A discharge standard. The improvement of the standard of sewage treatment plant can improve the water quality and reduce the annual discharge of pollutants. The annual discharge of pollutant COD,BOD5,SS is reduced by 18.25 tons, NH3-N is 5.48 tons, TN is 9.13 tons. TP is 0. 91 tons. The total investment is 4.4375 million yuan, the unit investment of ton water is 887.50 yuan, the operation cost of reconstruction is 0.103 yuan / ton water, and the total operation cost is 0.803 yuan / ton water after revamping.
【学位授予单位】：浙江工商大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703
本文编号：2319436
[Abstract]:In order to implement the decision plan of the provincial party committee and the provincial government "five water management, pollution control first", to further strengthen the water environment management in Zhejiang Province, to improve the water environment in an all-round way, and to speed up the transformation and upgrading. On April 30, 2014, The Environmental Protection Department of Zhejiang Province issued the implementation Plan for sewage treatment in Zhejiang Province (2014-2017), in which it was pointed out that "adhere to the 'one plant, one policy' policy, and speed up the upgrading of municipal sewage treatment plants." For all sewage treatment plants whose effluent quality is not up to the first class A standard of GB18918-2002, the upgrading of standards is carried out. " The design scale of a town sewage treatment plant in Linan City of Zhejiang Province is 5000 tons / day. The treatment process of "A2O-SBR standard discharge well for primary settling tank of grid sand sink" is adopted. The effluent quality was designed according to the first class B standard of pollutant discharge standard for urban sewage treatment plant. During operation, the actual treatment load rate is 67-92, the actual influent quality is basically smaller than the designed value, and the actual effluent COD,BOD5 reaches the first class A standard. Although the actual effluent SS,TN,TP basically reached the primary B standard of the original design, it did not meet the first class A standard. There is no tailings disinfection device in the original project. Therefore, the removal of TN,TP,SS and the disinfection of the tail water are the key points and difficulties in the upgrading of the standard. In this paper, the present situation, operation situation and difficulties of sewage treatment plant are analyzed and studied, and the parameters of original design process, structure design and equipment selection are checked, and the difficulties of standard raising are analyzed and the corresponding solving measures are put forward. By setting the suspended PVA multiphase polymer biofilm to enhance the biochemical treatment ability, the efficiency of denitrification can be improved without stopping water and stopping. The advanced treatment process, coagulation sand filter, was added behind the biochemical tank. Aluminum sulfate was used as flocculant and PAM as coagulant aid to strengthen the ability of phosphorus removal and SS removal. The microorganism contamination in tail water was removed by ultraviolet disinfection, so that the TN,TP,SS, fecal Escherichia coli in the final effluent could meet the requirement of the first A discharge standard. The improvement of the standard of sewage treatment plant can improve the water quality and reduce the annual discharge of pollutants. The annual discharge of pollutant COD,BOD5,SS is reduced by 18.25 tons, NH3-N is 5.48 tons, TN is 9.13 tons. TP is 0. 91 tons. The total investment is 4.4375 million yuan, the unit investment of ton water is 887.50 yuan, the operation cost of reconstruction is 0.103 yuan / ton water, and the total operation cost is 0.803 yuan / ton water after revamping.
【学位授予单位】：浙江工商大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703
【共引文献】
相关期刊论文 前2条
1 郑新华;;城市污水生物除磷脱氮机理研究探讨[J];北方环境;2013年07期
2 张双圣;刘汉湖;张龙;吴伟;王晓青;;厌氧水解-分点进水倒置A~2/O处理低含量印染废水研究[J];水处理技术;2011年02期
，本文编号：2319436
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