| 重力出流式膜生物反应器的膜通量及膜污染控制研究 |
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| 中文关键词 膜生物反应器 重力出流 膜通量 膜污染 生活污水 垃圾渗滤液 |
| 英文关键词 membrane bioreactor gravity flow permeate flux membrane fouling domestic sewage landfill leachate |
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| 中文摘要 |
| 采用一种新型的重力出流式膜生物反应器（MBR）处理生活污水和垃圾渗滤液，考察了其在长期运行过程中膜通量的变化规律及其影响因素。试验结果表明，该MBR能够在较低液位水头（8.5～15.0kPa）的作用下连续出水，并获得较高的膜通量。处理生活污水时，平均膜通量为11.2L?(m2?h)-1；处理垃圾渗滤液时，平均膜通量为6.4L?(m2?h)-1。研究发现，污泥浓度对膜通量影响大小与曝气强度有关。当曝气强度小于400m3?(m2?h)-1时，膜通量随着污泥浓度的升高显著下降；当曝气强度大于400m3?(m2?h)-1时，膜通量几乎不受污泥浓度和曝气强度的影响。对膜的化学清洗试验表明，NaOH+NaClO溶液清洗效果最佳，膜通量可恢复至初始通量的85％以上。进一步的研究表明，混合液中高浓度的溶解性胞外聚合物是MBR处理垃圾渗滤液时膜通量较低的主要原因。 |
| 英文摘要 |
| A novel membrane bioreactor (MBR) with gravity flow was applied to treat domestic sewage and landfill leachate. The variation of permeate flux and its impact factors were studied. The long-term test showed that the average permeate flux of this MBR could be 11.2L?(m2?h)-1 under the pressure of 8.5kPa for treating domestic sewage while 6.4L?(m2?h)-1 and 15.0kPa, respectively, for landfill leachate. The permeate flux increased with increase of aeration density and decrease of activated sludge concentration when aeration density was less than 400m3?(m2?h)-1. While activated sludge concentration and aeration density had hardly impact on the permeate flux when aeration density was more than 400m3?(m2?h)-1. The performances of several different cleaning solutions were tested and the results showed that NaOH-NaClO solution had the best cleaning efficiency. The permeate flux can recovered over 85% of the initial flux. A very high concentration of soluble extracellular polymeric substances (soluble EPS) existed in landfill leachate compared with domestic sewage, which was the main cause leading to a lower permeate flux when treating landfill leachate. |
