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在线超声作用下流化床膜生物反应器的膜污染机制

Keywords: 流化床膜生物反应器,在线超声,膜污染机制,污泥粒径,胞外聚合物,混合液粘度

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Abstract:

在流化床膜生物反应器中引用在线超声技术来控制膜污染,考察了在线超声对污泥混合液特性的影响,探讨了在线超声作用下的膜污染机制。结果表明:在线超声流化床膜生物反应器的跨膜压差(TMP)增长速度明显慢于普通流化床膜生物反应器,可延长膜清洗周期约51%。在线超声作用下,污泥平均粒径降低约70μm,污泥胞外聚合物(EPS)含量增加(14±5)mg/g,混合液溶解性微生物产物(SMP)有所降低;同时,在线超声使得污泥浓度和混合液粘度降低,从而改善了混合液的过滤性,有助于膜污染的控制。分析表明,在线超声能够减少膜表面不可逆污染的发生,膜的主要污染机制为泥饼层污染。

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