某污水处理厂水质分析研究

发布时间：2018-05-20 00:12

本文选题：A2O + 微曝氧化沟　；参考：《华南理工大学》2015年硕士论文

【摘要】：随着人们对生存环境的重视,国家对环境污染治理投入的加大,环保事业得到了迅猛的发展,水污染治理事业也进入了发展的高潮期,污水处理技术也得到了发展与广泛应用。在污水经典处理工艺A2O处理工艺的基础上,演化出如改良A2O工艺、微曝气氧化沟工艺等新工艺,每种工艺也因其各自特点应用于全国各地。本文研究的对象是某市某污水处理厂,该水厂一期工程的处理规模为8万t/d,二期17万t/d,三期规模30万t/d。其使用的污水处理工艺正是A2O微曝气氧化沟工艺,处理后的污水排进小金河,污水处理后的出水水质排放需达到广东省《水污染物排放限值》(DB44/26-2001)第二时段一级标准和《城镇污水处理厂污染物排放标准》一级A标准中的要求。目前我国污水厂设计与运行管理基本脱钩,即设计单位设计完污水处理厂后便基本不再过问水厂运行状况,而管理运行方是水厂运行管理的主要操作者,手里掌握了大量有价值的运行管理的实际数据,但是由于种种原因,这些数据很难反馈到水厂设计方手里,为其他污水厂设计提供有价值的设计建议,阻断了理论与实际的链接,从某种角度上不利于污水处理事业的发展。本论文以该水厂的工程设计为基础,从水厂建设投产后开始对水厂的运行进行全程跟踪研究,收集相应数据。通过对收集数据的分析研究,找出污水处理厂在实际过程中存在的问题,为污水厂提供实际运行的建议,争取在设计阶段能解决运行过程中的问题。也为以后其他污水处理厂设计提供有价值的建议。通过对该水厂的水质数据研究分析发现,该污水厂总体运行良好,BOD、COD、氨氮、总磷的去除效果良好,但总氮和SS的去除效果不理想。根据该污水处理厂的工艺特点和运行数据情况分析,可能影响总氮的因素是缺氧池的溶解氧浓度、生化池的回流比和进水CN比,影响SS去除效果的可能为二沉池的沉淀效果、氧化沟的曝气量和进水配水的均匀性。针对以上问题提出以下几点意见:1)进水CN比小于5时投加碳源;2)外回流比控制在50%以下;3)控制好氧化沟的曝气强度。
[Abstract]:With the attention of people to the living environment and the increase of national investment in environmental pollution control, environmental protection has been rapidly developed, water pollution treatment has also entered the high tide of development, sewage treatment technology has also been developed and widely used. Based on the classical treatment process of wastewater A2O, new processes such as improved A2O process and micro-aeration oxidation ditch process have been developed, and each process has been applied to various parts of the country because of its own characteristics. The research object of this paper is a sewage treatment plant in a certain city. The treatment scale of the first stage of the water treatment plant is 80,000 t / d, the second stage is 170000 t / d, and the third stage is 300000 t / d. The wastewater treatment process used is the A2O micro-aeration oxidation ditch process. The treated sewage is discharged into small Jin He. The effluent quality after sewage treatment should meet the requirements of the first class standard in the second period of Guangdong Province "Water pollutants discharge limit value" (DB44 / 26-2001) and the "Municipal sewage treatment Plant Pollutant discharge Standard" Grade A standard. At present, the design and operation management of wastewater treatment plants in our country is basically decoupled, that is, after the design of the sewage treatment plants, the design units basically no longer ask about the operation status of the water plants, and the management and operation parties are the main operators of the operation and management of the water plants. There are a lot of valuable operational management data in hand, but for a variety of reasons, these data are difficult to feed back into the hands of the water plant designer to provide valuable design advice for other sewage plant designs. Blocking the theoretical and practical links, from a certain point of view is not conducive to the development of sewage treatment. Based on the engineering design of the water plant, this paper starts to track and study the operation of the water plant from the start of construction and put into operation, and collects the corresponding data. Through the analysis and study of the collected data, the problems existing in the actual process of the sewage treatment plant are found out, the suggestions for the actual operation of the sewage treatment plant are provided, and the problems in the operation process can be solved in the design stage. It also provides valuable suggestions for the design of other sewage treatment plants in the future. Through the analysis of the water quality data of the water plant, it is found that the removal effect of BODCOD, ammonia nitrogen and total phosphorus is good, but the removal effect of total nitrogen and SS is not ideal. According to the process characteristics and operation data of the wastewater treatment plant, the factors that may affect the total nitrogen are the dissolved oxygen concentration in the anoxic tank, the reflux ratio of the biochemical tank and the influent CN ratio, and the precipitation effect of the secondary sedimentation tank is likely to affect the removal efficiency of SS. Aeration rate of oxidation ditch and uniformity of influent water distribution. In view of the above problems, the following suggestions are put forward: 1) the influent CN ratio is less than 5 and the carbon source is added 2) the external reflux ratio is controlled below 50%, and the aeration intensity of the oxidation ditch is well controlled.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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