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化工学报  2014 

投加助滤剂对高盐度冲击下MBR运行及膜污染影响

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Keywords: 膜生物反应器,高盐度冲击,溶解性微生物产物,胞外聚合物,膜污染

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Abstract:

以膜生物反应器(membranebioreactor,MBR)受高盐度废水冲击前后的活性污泥为研究对象,考察了助滤剂(硅藻土)投加对于MBR污染物去除及膜污染减缓的影响。实验结果表明投加硅藻土对高盐废水冲击后的MBR性能恢复效果显著。与对照反应器相比,投加60mg/L硅藻土可提高系统对传统污染物的去除效率,COD、NH4+-N及TP去除效率分别提高了4.9%,3.2%及78%;高盐度废水冲击显著增加了对照反应器的膜污染速率,其膜污染速率是投加硅藻土MBR的4倍。硅藻土具有的吸附性能及絮凝能力显著降低了MBR本体溶液中的溶解性微生物代谢产物含量,减小了膜污染速率。进一步研究发现,投加硅藻土增加了平均絮体粒径(meanparticlessizes,dp)及相对疏水性(relatedhydrophobic,RH),有利于减缓膜污染。

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