两级BAF与MBR在再生水回用中处理效果比较

发布时间：2018-06-20 14:51

本文选题：再生水回用 + 两级曝气生物滤池　；参考：《华中科技大学》2013年硕士论文

【摘要】：热电厂一直是工业用水的大户，实现再生水回用是充分利用热电厂水资源的有效途径。襄阳热电厂污水处理站目前采用DAT-IAT以及生物接触氧化工艺，尾水不能达到《城镇污水处理厂污染物排放标准》(GB18918—2002)一级B标准，尚不能直接回用，需要进行提标改造，使尾水达到再生水出水要求，而为了防止氨氮对铜管的腐蚀，回用水中氨氮浓度必须控制在1mg/L以下。本研究在襄阳热电厂现场进行，选用两级BAF和MBR进行动态小型对比试验，为污水处理工艺的提标改造和再生水回用工程设计和运行提供技术支撑。本试验用襄阳热电厂污水处理站的原水作为试验装置进水，分别比较了两级BAF和MBR在启动阶段的运行状况；比较了两种工艺在稳定运行阶段，不同进水负荷条件下以及不同溶解氧浓度条件下，两种工艺对COD、氨氮、TN、TP、SS去除效果。进行了两种工艺基于污染物去除相关性的综合出水水平分析。研究表明：启动阶段，两种工艺都采用人工接种污泥，然后进行闷曝。在进水同为0.5L/h条件下，两种工艺对于COD、氨氮、TN以及SS都可以达到出水水质要求，TP的去除没有达标。在稳定运行阶段，考察了进水负荷分别为0.5L/h、1.0L/h、1.5L/h的情况以及DO浓度从1.5~8mg/L之间变化时对于两种工艺的影响研究。两级曝气生物滤池最优运行条件为：进水负荷为1.0L/h，DO为2~5mg/L。膜生物反应器最优运行条件为：进水负荷为0.5L/h，DO为3~5mg/L。本文基于COD、TN、氨氮出水值的相关性，引入因子分析模型，对两种工艺分别进行分析，得到3个指标相互影响所形成的综合出水水平作为评判水质优劣标准。综合比较，两级曝气生物滤池相比较膜生物反应器启动更为迅速，对于污染物的去除效果更好，也更为稳定，因而在再生水回用工程中，两级曝气生物滤池优于膜生物反应器。
[Abstract]:Thermal power plant has always been a major user of industrial water, and it is an effective way to make full use of water resources of thermal power plant to reuse reclaimed water. At present, the wastewater treatment station of Xiangyang Thermal Power Plant adopts DAT-IAT and biological contact oxidation process. The tailing water can not meet the first class B standard of pollutants discharge Standard of Municipal sewage treatment Plant (GB18918-2002) and cannot be directly reused, so it needs to be upgraded. In order to prevent the corrosion of copper pipe by ammonia nitrogen, the concentration of ammonia nitrogen in recycled water must be controlled below 1 mg / L. This study was carried out in Xiangyang Thermal Power Plant. Two stages BAF and MBR were selected to carry out dynamic small scale contrast test, which provided technical support for the improvement of wastewater treatment process and the design and operation of recycling project. Using raw water from wastewater treatment station of Xiangyang Thermal Power Plant as influent water, the two stages BAF and MBR were compared in start-up stage, and the two processes were compared in stable operation stage. Under different influent loading conditions and different dissolved oxygen concentrations, the removal effects of two processes on COD, TNN TPSS were studied. The comprehensive effluent level analysis of two processes based on the correlation of pollutant removal was carried out. The results showed that both processes were inoculated with sludge and then exposed. Under the same influent of 0.5L / h, the removal of TP from COD, NH3-N TN and SS could not meet the requirement of effluent water quality. In the stable operation stage, the influence of the influent load of 0.5 L / h, 1.0 L / h, 1.5 L / h and the variation of do concentration from 1.5 mg / L to 8 mg / L on the two processes were investigated. The optimal operating conditions of two-stage biological aerated filter are as follows: the influent load is 1.0 L / h, do is 2 mg / L. The optimal operating conditions of the membrane bioreactor are as follows: the influent load is 0.5 L / h and the do is 3 mg / L. In this paper, based on the correlation of effluent value of CODN and NH3-N, factor analysis model was introduced to analyze the two processes, and the comprehensive effluent level formed by the interaction of three indexes was obtained as the criterion to judge the quality of the effluent. Compared with membrane bioreactor, two-stage biological aerated biofilter is more efficient and stable than membrane bioreactor, so it is better than membrane bioreactor in reclaimed water reuse project.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU991.4

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