Contribution of various constituents of activated sludge to membrane bioreactor fouling
Contribution of various constituents of activated sludge to membrane bioreactor fouling
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DOI：
10.1016/s0960-8524(99)00163-7
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发表时间：
2000-06-01
影响因子：
11.4
通讯作者：
Geaugey, V
中科院分区：
文献类型：
--
作者：
Defrance, L;Jaffrin, MY;Geaugey, V
城市污水在中试膜生物反应器 (MBR) 中进行处理，该反应器的原料来自污水处理厂的原废水。 MBR由一个曝气池组成，该曝气池注入含有600升活性污泥的原水，该活性污泥通过含有面积为0.25m(2)、孔径为0.1μm的陶瓷膜的外部回路进行再循环。悬浮固体（SS）浓度稳定在10克/升，污泥和水力停留时间（SRT和HRT）分别为60天和24小时。化学需氧量消除率高于95%。流变测试表明，来自 MBR 和经典工厂曝气池的活性污泥是非牛顿的。为了评估不同污泥组分对结垢的贡献，首先通过沉降将 SS 从污泥中分离出来，然后通过絮凝和沉降相结合的方式将胶体从上清液中分离出来。 SS、胶体和溶解分子 (DM) 对污垢引起的过滤阻力的相对贡献分别为 65%、30% 和 5%。还测量了每种成分的过滤阻力与其浓度的函数关系。当细胞浓度从 2 克/升升至 6 克/升时，渗透通量并没有减少太多。然后将测得的总过滤阻力与污泥中相同浓度下每种成分的阻力之和进行比较。发现该计算总和比测量的总电阻高 50%，这表明每种成分引起的污垢电阻不是相加的。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
Urban effluents were treated in a pilot membrane bioreactor (MBR) fed by raw wastewater from a sewage plant. The MBR consisted of an aerated tank fed with raw water containing a volume of 600 l of activated sludge which was recirculated through an external circuit containing a ceramic membrane of 0.25 m(2) area with 0.1 mu m pores. Suspended solids (SS) concentration was stabilized at 10 g/l, The sludge and hydraulic residence times (SRT and HRT) were 60 days and 24 h, respectively. Elimination of chemical oxygen demand was higher than 95%. Rheological tests showed that activated sludges from the MBR and from the aeration tank of a classical plant were non-Newtonian. In order to evaluate the contribution of various sludge fractions to fouling, SS were first separated from the sludge by settling, then colloids were separated from the supernatant by a combination of flocculation and settling. The relative contributions of SS, colloids, and dissolved molecules (DM) to the resistance to filtration caused by fouling were found to be 65%, 30% and 5%, respectively. The filtration resistance due to each constituent was also measured as a function of its concentration. The permeate flux did not decrease much when cellular concentration rose from 2 to 6 g/l, The measured total filtration resistance was then compared with the sum of resistances of each constituents at the same respective concentrations as in the sludge. This calculated sum was found to be 50% higher than the measured total resistance, indicating that fouling resistances caused by each constituent were not additive. (C) 2000 Elsevier Science Ltd. All rights reserved.