水力停留时间对分置式厌氧膜生物反应器污泥混合液性质和膜污染的影响研究

发布时间：2018-01-13 16:05

  本文关键词：水力停留时间对分置式厌氧膜生物反应器污泥混合液性质和膜污染的影响研究　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 厌氧膜生物反应器 啤酒废水 水力停留时间 污泥混合液性质 膜污染

【摘要】：厌氧膜生物反应器(Anaerobic Membrane Bioreactor,AnMBR)是将厌氧生物处理技术与膜分离技术有效结合的一种新型、高效、稳定的污水处理工艺,实现了水力停留时间(HRT)和污泥停留时间(SRT)的完全分离,具有甲烷转化率高、污泥龄长、污泥产率低、污泥浓度高、耐冲击负荷强、占地面积小、工艺设备集中以及易于自动化控制等特点,是极具潜力的厌氧处理技术。目前,随着厌氧生物处理技术和膜分离技术的日益成熟,已有一些学者针对分置式及一体式AnMBR的操作条件和膜污染状况进行研究,但仍未有一致的结论。本文以西安市汉斯啤酒厂废水为小试分置式AnMBR进水,探究该反应器的最佳运行工况及HRT对污泥混合液性质和膜污染的影响,尝试为通过控制HRT实现AnMBR工艺优化和控制膜污染提供参考。主要研究成果如下:(1)在启动阶段,An MBR运行良好。控制反应器温度在35±2℃,HRT为48 h,进水COD浓度在1000~3000 mg/L的条件下,仅17天就完成了反应器的启动。系统对COD的去除率在83.33~96.94%之间,反应器内各项指标均处于合理的范围内。但是系统基本不具备脱氮除磷效果。(2)在稳定运行阶段,HRT为40 h时,有机负荷(OLR)为2.24 kgCOD/(m3·d),污泥负荷(F/M)为0.58 kgCOD/(kgMLVSS·d)的条件下,系统可以获得较好的处理效果和较低的膜污染速率,确定此工况为最佳运行条件。(3)HRT在40~16 h之间逐渐缩短时,产生较高的OLR和F/M,影响了厌氧微生物的代谢活动,使胞外聚合物(EPS)、微生物代谢产物(SMP)和污泥粒径增加;EPS和SMP中的蛋白质及污泥粒径对泥饼层阻力(Rc)的影响较大,它们的增加促使膜面滤饼层形成,增加Rc,继而增加膜过滤阻力(Rt),导致跨膜压差(TMP)快速增长,加快了膜污染的进程。(4)HRT对厌氧膜生物反应器污泥混合液性质和膜污染进程有着重要的影响,通过优化HRT可以便于保障处理效果和控制膜污染。
[Abstract]:Anaerobic Membrane Bioreactor. AnMBR is a new efficient and stable wastewater treatment process which combines anaerobic biological treatment technology with membrane separation technology. The complete separation of HRT (HRT) and SRT (sludge retention time) was realized, with high methane conversion, long sludge age, low sludge yield, high sludge concentration and strong shock resistance. With the advantages of small area, centralized process equipment and easy automatic control, it is a potential anaerobic treatment technology. At present, with the development of anaerobic biological treatment technology and membrane separation technology, the technology of anaerobic biological treatment and membrane separation is becoming more and more mature. Some scholars have studied the operating conditions and membrane fouling of split and integrated AnMBR. However, there is still no consistent conclusion. In this paper, the wastewater from Hans brewery in Xi'an City was used as the inlet water of separate AnMBR to investigate the optimal operation condition of the reactor and the effect of HRT on the properties of sludge mixture and membrane fouling. This paper attempts to provide a reference for AnMBR process optimization and membrane fouling control by controlling HRT. The main research results are as follows: 1) in the start-up stage. An MBR was operated well under the conditions of controlling the reactor temperature at 35 卤2 鈩，

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