Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
Bioresour Technol. 2012 Oct;122:17-21. doi: 10.1016/j.biortech.2012.04.020. Epub 2012 Apr 19.
A pilot-scale submerged membrane bioreactor (MBR) using nylon mesh as filter was investigated for treatment of low-strength municipal wastewater (average influent COD=145.7±59.9 mg/L). During the operation, biomass was effectively retained by the nylon mesh with biofilm attached, and a low effluent turbidity of below 2 NTU was obtained. The average COD and NH(4)(+)-N removal efficiencies reached 86.3% and 98.1%, respectively, at a hydraulic retention time of 5 h. A sludge concentration of 4.15±0.15 g/L was maintained in the system without excess sludge discharge, attributed to the prolonged solid retention time and low organic loading rate. The low sludge concentration was also beneficial for mitigating the filter fouling. Thus, this mesh filter MBR provides a low-cost, efficient and simple approach to treat municipal wastewater, and shows a high potential for application in rural and sparsely populated areas.
采用尼龙网作为过滤介质的中试规模浸没式膜生物反应器（MBR）用于处理低浓度城市污水（平均进水 COD=145.7±59.9mg/L）。在运行过程中，附着生物膜的尼龙网有效地截留了生物质，出水浊度低于 2NTU。在水力停留时间为 5h 的条件下，COD 和 NH(4)(+)-N 的平均去除率分别达到 86.3%和 98.1%。系统无需排泥即可维持 4.15±0.15g/L 的污泥浓度，这归因于较长的固体停留时间和较低的有机负荷率。低污泥浓度也有利于减轻膜污染。因此，这种网式膜生物反应器为处理城市污水提供了一种低成本、高效、简单的方法，在农村和人口稀少地区具有很高的应用潜力。
