【作者】 魏旭；

【导师】 陶涛；

【作者基本信息】 华中科技大学 ， 市政工程， 2007， 硕士

【摘要】 随着水体污染加剧,水资源短缺已成为我国经济、社会进一步发展的主要障碍和制约因素。为了解决水资源短缺的问题,水的再生与回用已越来越受到人们的重视。本课题,通过调整HRT、DO、pH等运行参数,研究了各参数对MBR中水回用系统去除污染物效果的影响;分析同步硝化反硝化反应的影响因素;调试总结出最优运行参数;采用一系列措施延缓膜组件的堵塞和延长膜的清洗周期,验证该方法的可行性;在调试出最优运行参数的基础上,针对MBR中水回用系统进行技术经济分析。研究表明:溶解氧是影响MBR去除率的主要因素;温度、pH值、水力停留时间、污泥浓度等影响较小;膜能有效截留MBR反应器内的有机大分子,对处理系统的稳定运行发挥这重要的作用。溶解氧对同步硝化反硝化的影响较大,HRT和污泥浓度不是主要影响因素。在MBR反应器除磷脱氮过程中有同步硝化反硝化作用和反硝化除磷作用,短程硝化反硝化现象不明显。在试验的半年时间内,MBR的膜通量并没有明显的下降趋势,说明采取的措施的有效和可行性。试验中,我们确定了MBR反应器处理此种市政污水,最经济合理的运行参数:HRT为6小时,曝气池溶解氧控制范围为0.8～1.2 mg/L,不需调节pH值,污泥浓度2000～5000 mg/L等。在此参数下,中水回用系统处理城市污水,出水水质达到和超过《城市污水再生利用-城市杂用水水质标准》GB/T18920-2002标准。计算得到MBR反应器中水回用系统理论吨水制水成本为0.837元/m3。试验研究为生产性实践提供了有益的借鉴。更多还原

【Abstract】 With the intensification of water pollution, water resource is becoming the primary problem which cumbers the further processing of economy and society of our country. To solve this problem of lack water, water regeneration and reuse is being paid more attention.We did some research on infection of phosphorus and nitrogen removal in membrane bioreactor reclaimed water reuse systerm, by changing some parameters of processing, such as HRT, DO level, pH, and so on. We also analysed the infection of simultaneous nitrification and denitrification (SND). We tried our ways to control membrane fouling, and we analysed the feasibility of MBR on technology and economy.The results showed that, DO level was the major factor; temperature, pH, HRT, and MLSS did less infection on removing rate of MBR. Membrane made MBR had a steady removal rate, by rejecting effectively.DO level was the major factor to infect SND, meanwhile HRT and MLSS were less important to the removal rate. We proved that simultaneous denitrifying phosphorus removal and SND did exist, Short-cut Nitrification and Denitrification did not happen. That membrane flux had not decreased markedly proved that our ways were effective and feasible.During the experiment, we confirmed the most economical and rational processing parameters to treat this kind of municipal sewage. HRT was 6 hours, DO range was 0.8 to 1.2 mg/L, MLSS range was 2000 to 5000 mg/L, and there was no need to control pH. The effluent of the two reactors which were operated under the best parameters had already achieved the standards of <the Reuse of Urban Recycling Water-Water Quality Standard for Urban Miscellaneous Water Consumption> (GB/T18920-2002), when the influent came from sewage. The processing cost to treat a ton of waste water was 0.837 yuan.The pilot plant research can be used for reference for production practice.更多还原