【作者】 王雪芹；

【导师】 崔崇威；

【作者基本信息】 哈尔滨工业大学 ， 环境工程， 2006， 硕士

【摘要】 本文对MBR与PAC-MBR两种膜生物反应器处理生活污水进行试验研究,研究了两种膜生物反应器长期运行的可行性、动力学降解模式、最优运行条件的控制、胞外聚合物与膜污染的关系。研究了阳离子树脂法提取EPS的最佳条件。结果表明,树脂投加量为60g/gVSS、提取时间为4h、振摇频率为200rpm时,EPS提取效果较佳。并与超声波树脂联用法进行比较。在膜生物反应器长期运行的可行性研究中,两种膜生物反应器运行十几天后趋于稳定,对COD和NH₄⁺-N的去除率都很高,平均去除率都在95%以上,出水COD<20mg/L,NH₄⁺-N<2mg/L,其中PAC-MBR对COD的去除效果优于MBR,尤其在启动初期,二者差别较大。两种反应器对TN的去出率差别不大,稳定阶段去除率在60%左右。同时考察了EPS含量与膜污染的关系,与MBR相比,PAC-MBR中因粉末活性炭的加入,EPS含量及粘度较低,过膜压力变化较慢,膜污染有所减轻。并对反应器中悬浮EPS含量和膜阻力进行曲线拟合,二者相关性较好。分别以Eckenfelder模型和Monod模型为基础,研究了MBR中COD和NH4+-N的降解速率与运行时间的关系,结果表明当MBR和PAC-MBR的运行时间分别为39⁴8d和48d时,COD降解速率最大;对应的运行时间为32d和25d时,NH₄⁺-N氧化速率最大。此外发现EPS和COD降解速率常数有很好的相关性, MBR与PAC-MBR中二者的关系式分别为:CEPS=38.268K1+161.08;CEPS=59.287K2+77.33。两种膜生物反应器的最佳运行条件比较一致,都是:HRT=6h;DO=2.5mg/L;pH=7.13～8.05,C/N=18.2～38.92。并且考查了EPS含量随各参数改变的变化规律。更多还原

【Abstract】 This paper studied on the experiment using MBR and PAC-MBR for treating domestic wastewater.It mainly studied two bio-membrane reactors about the feasibility of lasting operation, kinetics model of degradation, controlling of the optimum operation condition, the relation between EPS and membrane fouling.The optimum condition of extracting EPS with cation resin was researched on this paper. The outcome showed the extracting effect would be better when the dose of resin was 60g/gVSS, extracting time was 4 h and the frequency of shaking was 200rpm. Otherwise, this method was compared with the one of ultrasonic joint cation resin.During the lasting operation of two bio-membrane reactors, they went stable after 10days. Then COD、NH4+-N could be removed effectively and the avera-ge removal efficiencies of them were over 95%. COD and NH4+-N of effluent were respectively below 20mg/L and 2mg/L. The removal efficiency of COD in PAC-MBR was higher than the one in MBR, expecially in initial stage. But the removal efficiency of TN in them was close and could be to 60% in stable stage. Otherwise, the effect of EPS content on membrane fouling was also studied. Because of adding PAC, EPS content and viscidity in PAC-MBR were lower. The pressure through membrane changed slowly. It was obvious that adding PAC could lighten membrane fouling. In addition, the content of suspending EPS in reactor and membrane resistance were fitted and they had better pertinency.Separately based on Eckenfelder model and Monod model, removal efficiencies of COD、NH4+-N against time had been investigated. The result was that removal efficiencies of COD were highest at 39~48d for MBR and 48d for PAC-MBR. The highest degrading rates of NH4+-N in MBR and PAC-MBR were respectively at 32d and 25d. In addition, we found better pertinence between the content of EPS and degrading rate constant. The relation formula of MBR and PAC-MBR were respectively following as: CEPS=38.268K1+161.08;CEPS=59.287K2+77.33.Both MBRs had identical optimum operation conditions. The result showed更多还原