安徽省六安市城北污水处理厂升级改造设计研究

发布时间：2018-03-01 14:28

本文关键词： 氧化沟工艺提标改造方案比较深度处理　出处：《安徽建筑大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以安徽六安市城北污水处理厂实际运行工艺为研究对象,采用生物法氧化沟工艺处理生活污水,该厂于1999年筹建,于2003年运行,设计处理能力为8万吨/天,设计出水水质达到《城镇污水处理厂污染物排放标准》(GB18918-2002)中的二级标准。随着城区的不断扩张,城区管网分流制的改造,污水污染物浓度会大幅提升,严重影响现有工艺出水水质,尤其是氮磷污染物指标。因此,该厂有必要进行技术升级改造。通过对城市排水现状及污水厂运行情况的调查分析,以及污水厂进出水水质指标的检测,发现该厂目前仍能正常运行,出水水质指标基本能够满足原设计标准。实测进水水质为:化学需氧量(COD)202.1mg/L、生物需氧量(BOD)92.4 mg/L、悬浮固体(SS)127.67 mg/L、氨氮9.8 mg/L,目前仍在设计进水水质范围内。针对该水厂的实际运行现状,分析该水厂目前在水质、工艺、设备和运行方面存在的相关问题,并提出了相应的改造方案。一是对原有的氧化沟工艺进行改造,增加多点进水,增加反硝化段的碳源浓度,强化反硝化脱氮;二是增加二沉池出水深度处理工艺;三是更换污水厂原有部分设备,增加污泥一体化深度脱水设备;四是升级污水厂原有控制软件和硬件系统。经过对生化处理、深度处理工艺、污泥深度脱水工艺、消毒工艺、化学除磷药剂、除臭工艺等方面的优化选择,确定了生化处理选择多点进水强化脱氮氧化沟工艺,深度处理选择二沉池出水+微絮凝过滤+消毒工艺,污泥处理选择一体化污泥深度脱水技术,化学除磷选择聚合氯化铝后置沉淀的投药方式,除臭工艺选择活性氧离子法除臭技术。经过改造后,对出水水质进行统计调研,发现出水有机污染物、氮磷、悬浮物的去除效果均有不同程度提高,COD去除率明显升高,达到到89%以上,BOD去除率达到91%以上。出水氨氮稳定在0.5mg/L以下,总氮含量在10mg/L以下出水总磷含量稳定在0.5mg/L以下,总磷的去除率稳定在90%以上,出水SS浓度稳定在5mg/L以下,各项指标均满足一级A标准。
[Abstract]:In this paper, the actual operation process of Chengbei sewage treatment Plant in Lu'an City, Anhui Province, was studied. The biological oxidation ditch process was used to treat domestic sewage. The plant was set up on 1999 and operated on 2003. The designed treatment capacity was 80,000 tons per day. The designed effluent quality is up to the second class standard in the "discharge Standard of pollutants in Urban sewage treatment Plant" (GB18918-2002). With the continuous expansion of the urban area and the transformation of the distribution system of the urban pipe network, the concentration of the pollutants in the sewage will be greatly increased. The effluent quality of the existing process is seriously affected, especially the nitrogen and phosphorus pollutant index. Therefore, it is necessary for the plant to carry out technical upgrading and renovation. Through the investigation and analysis of the present situation of urban drainage and the operation of the wastewater treatment plant, As well as the inspection of the water quality index of the sewage treatment plant, it is found that the plant can still operate normally at present. The effluent water quality index can basically meet the original design standard. The actual influent water quality is: chemical oxygen demand 202.1 mg / L, biological oxygen demand 92.4 mg / L, suspended solid state SS 127.67 mg / L, ammonia nitrogen 9.8 mg / L, at present still within the scope of the design of the influent water quality. The problems existing in water quality, process, equipment and operation of the water plant are analyzed, and the corresponding retrofit scheme is put forward. One is to improve the original oxidation ditch process by increasing the multi-point influent and increasing the carbon source concentration in denitrification stage. Strengthening denitrification and denitrification, adding advanced treatment process of secondary sedimentation tank effluent, replacing the original equipment of wastewater treatment plant, increasing sludge integrated deep dewatering equipment; Fourth, upgrade the original control software and hardware system of the wastewater treatment plant. After optimizing the selection of biochemical treatment, advanced treatment process, sludge deep dewatering process, disinfection process, chemical phosphorus removal agent, deodorization process, etc. It is determined that biochemical treatment selects multi-point influent enhanced denitrification and oxidation ditch process, advanced treatment selects secondary sedimentation tank effluent micro-flocculation filtration and disinfection process, and sludge treatment selects integrated sludge depth dewatering technology. The chemical phosphorus removal method was used to select the way of post-precipitation of polyaluminium chloride, and the deodorization technology was selected to deodorize by reactive oxygen species ion method. After the modification, the effluent quality was investigated statistically, and the organic pollutants, nitrogen and phosphorus were found out in the effluent. The removal efficiency of suspended solids was increased to different extent, reaching to more than 89%, the removal rate of bod was more than 91%. The ammonia nitrogen in effluent was below 0.5 mg / L, the total nitrogen content was below 10 mg / L, and the total phosphorus content in effluent was below 0.5 mg / L. The removal rate of total phosphorus is more than 90%, the SS concentration of effluent is below 5 mg / L, and all the indexes meet the first class A standard.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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