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污泥负荷对UASB处理低浓度污水运行效果和污泥性质的影响

Keywords: 低浓度生活污水,UASB,污泥负荷,比产甲烷活性,溶解性微生物产物,胞外聚合物

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Abstract:

采用升流式厌氧污泥床(UASB)反应器处理低浓度生活污水,探讨了不同污泥负荷对运行效果及污泥性质的影响。通过考察有机物去除率、有机酸积累、污泥粒径、污泥比产甲烷活性、溶解性微生物产物(SMP)、胞外聚合物(EPS)等生化指标,得出如下结论:在受试条件下,污泥负荷率的升高不利于有机物的去除;有机酸特别是乙酸的积累,以及受基质缺乏及污泥洗脱限制的污泥积累,是影响处理效果的因素;稳定阶段污泥的胞外聚合物以紧密附着型EPS为主,污泥负荷升高将导致其浓度升高,而对SMP和松散附着型EPS没有显著影响,EPS的浓度及其组成不影响污泥性质。高的污泥负荷下污泥的产甲烷活性较高。在本实验中,F/M=0.4gCOD/(gMLSS·d)是最佳的污泥负荷条件。

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