不同泥龄下溶解性微生物产物对膜污染的影响

Membrane Fouling Behaviors of Soluble Microbial Products at Various Sludge Retention Times

摘要:

采用4套平行运行的小试膜生物反应器(membrane bioreactors,MBR)对不同泥龄下膜生物反应器中溶解性微生物产物(soluble microbial products,SMP)的膜污染行为进行研究.结果显示,SMP的膜污染潜势和积累程度均随着泥龄的缩短而增大；MBR中与出水中SMP的相对分子质量分布相似；SMP的相对分子质量分布呈明显的双峰特征,泥龄长时高分子含量升高； SMP中的碳水化合物较蛋白质更容易在MBR中积累,泥龄短时尤为显著.因此,SMP组分按照不同形式划分,其膜污染潜势推测为碳水化合物>蛋白质,小分子组分>大分子组分.

Abstract:

The characteristics and behaviors of soluble microbial products (SMP) in membrane bioreactors (MBRs) were investigated at various sludge retention times (SRTs) by four paralleled laboratory-scale MBRs.The fouling potential of SMP and the extent of SMP accumulation were found to significantly increase with decreasing SRT.The molecular weight(MW) distributions of SMP generally exhibited a bimodal pattern with high MW components became more evident at long SRTs.Similar molecular weight distributions of SMP in MBRs and in effluents were observed.Carbohydrate appeared more prone to accumulate in MBRs than Protein,especially at short SRTs.Results above suggest that in a comparison of the tendency to cause membrane fouling,carbohydrate is higher than protein,and components of SMP with larger molecular weight appear to have higher tendency than that with smaller molecular weight.