污水处理厂工艺设计优化及改造的模拟方法与应用研究

发布时间：2018-11-06 07:13

【摘要】：国家经济发展及城市化进程加快对污水处理提出了更高的要求,污水处理厂需要进行优化和改造才能满足更为严格的排放标准,利用污水处理模型软件对污水处理厂进行建模模拟可以快速地诊断污水处理厂潜在问题,优化工艺运行参数和改进设计方案等。本文利用BioWIN#174;软件对不同类型的污水处理厂进行模拟,构建了一套完整的模拟研究体系,包括概化模型的建立、相关数据参数的收集以及模型校准的方法等,对新建污水处理厂、运行中的污水处理厂和待升级改造污水处理厂给出了不同的研究思路。对镇江东区污水处理厂一期工程(新建)多模式A2/O工艺进行了模型模拟研究,结果表明:该厂在基准状态下是可以满足其出水标准的;当进水COD较低时,会因为碳源不足导致出水总氮超标,需要外加碳源或者将部分好氧池改缺氧池;当进水工业废水含量超过30%时,会导致出水COD无法达标;在氨氧化菌活性较差的情况下,冬季出水氨氮可能会面临超标风险,需要提高工艺污泥龄并增大曝气区域。对无锡城北污水处理厂三期(运行中)Orbal氧化沟工艺进行了模型模拟研究,结果表明:在实际进水的C/N下,将内回流比控制在10~20%可以使得出水总氮最优;现工艺的外回流比和排泥量都处在一个较优的状态;将外沟的碳源投加点位设在进水口前的区域会使得碳源的利用率达到最优;现工艺中的除磷药剂PAC存在过量投加现状,将投加量控制在1800kg/d左右最为合理;采用更合理的曝气转碟编组方案可以在不改变曝气量的前提下改善出水水质。对沈阳沈水湾污水处理厂(待升级改造)现状浮动填料工艺和改造ANO+浮动填料工艺进行了模型模拟研究,结果表明:现状工艺存在MLSS较低的问题以及缺少缺氧反硝化区的问题,通过工艺参数优化无法使其满足新的出水标准,存在升级改造的必要性;改造后的工艺可以明显改善出水水质,并且可以满足新的出水标准;浮动填料段的实际挂膜情况影响着出水的水质;单点进水会比两点进水带来更好处理效果;在冬季运行时可适当提高系统污泥龄以保证出水氨氮达标。
[Abstract]:The national economic development and the acceleration of urbanization have put forward higher requirements for sewage treatment, and sewage treatment plants need to be optimized and reformed to meet more stringent discharge standards. The modeling and simulation of sewage treatment plant by using sewage treatment model software can diagnose the potential problems of sewage treatment plant quickly, optimize the process operation parameters and improve the design scheme. This paper uses BioWIN#174; The software simulates different types of sewage treatment plants, constructs a set of complete simulation research system, including the establishment of generalizable model, the collection of relevant data parameters and the methods of model calibration, etc. Different research ideas are given for the sewage treatment plant in operation and the sewage treatment plant to be upgraded. The model simulation of the multi-mode A _ 2 / O process in the first phase of Zhenjiang East sewage treatment Plant is carried out. The results show that the effluent standard of the plant can be satisfied under the standard condition. When the influent COD is low, the effluent total nitrogen will exceed the standard due to the lack of carbon source, and it will be necessary to add carbon source or change part of aerobic tank into anoxic tank, and when the influent industrial wastewater content exceeds 30%, the effluent COD will not reach the standard. Under the condition that the activity of ammonia-oxidizing bacteria is poor, the ammonia nitrogen in the effluent in winter may face the risk of exceeding the standard, so it is necessary to increase the age of process sludge and increase the aeration area. The model simulation of the Orbal oxidation ditch process in the third (running) stage of Wuxi Chengbei sewage treatment Plant is carried out. The results show that under the actual influent C / N, the effluent total nitrogen can be optimized by controlling the internal reflux ratio at 10 ~ 20%; The ratio of external reflux and the amount of mud discharge are in a better state, and the carbon source of the outer ditch is placed in the area in front of the inlet, which will make the utilization ratio of carbon source to reach the optimum. In the present process, there is an excessive dosage of phosphorus removal agent PAC, and it is most reasonable to control the dosage of PAC at about 1800kg/d, and to adopt a more reasonable scheme of aeration transfer disc formation can improve the effluent quality without changing the aeration rate. The present floating packing process and the modified ANO floating packing process in Shenyang Shenshuiwan sewage treatment Plant are studied by model simulation. The results show that the current process has the problem of low MLSS and the lack of anoxic denitrification zone. Through the optimization of process parameters, it can not meet the new effluent standard, so it is necessary to upgrade. The modified process can obviously improve the effluent quality and meet the new effluent standard; the actual membrane hanging in the floating packing section will affect the effluent quality; the single point influent will bring better treatment effect than the two-point influent. The sludge age of the system can be increased properly in winter to ensure the ammonia nitrogen in effluent reaches the standard.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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