| 曝气强度对膜生物反应器污泥混合液可滤性的影响 |
| 摘要点击 1291 全文点击 1271 投稿时间：2007-09-28 修订日期：2007-11-24 |
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| 中文关键词 膜生物反应器 溶解性微生物产物 相对分子质量分布 胞外聚合物 颗粒粒径分布 |
| 英文关键词 membrane bioreactor(MBR) soluble microbial products (SMP) relative molecular mass distributions extracellular polymeric substances(EPS) particle size distributions (PSD) |
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| 中文摘要 |
| 主要研究了曝气强度对膜生物反应器（MBR）膜污染的影响.2套MBR采用恒流出水模式连续运行60 d，曝气强度分别为500及100 Ｌ/h, 应用死端过滤装置来检测不同阶段污泥混合液的可滤性.实验中对不同曝气强度下的溶解性微生物代谢产物（SMP）分子质量分布、颗粒粒径分布、胞外聚合物(EPS)含量进行了测定.结果表明，过高的曝气强度将恶化污泥混合液的可滤性，增加了膜污染速率.进一步研究表明，曝气强度的增加导致了污泥混合液上清液中相对分子质量>10 000的SMP浓度的增加，此部分大分子有机物浓度直接影响了污泥混合液的可滤性.过高的曝气强度也导致了污泥絮体中1～10 μm细小颗粒和EPS含量的增加. |
| 英文摘要 |
| The influence of aeration intensity on membrane fouling in membrane bioreactors (MBR) was to investigate. Two lab-scale MBR with aeration intensity of 500 and 100 Ｌ/h were operated for 60 days at a constant permeate flux. The dead-end filtration tests were conducted to confirm the mixed sludge filterability under each condition. The effect of aeration intensity on relative molecular mass distributions of SMP, the particle size distributions (PSD) of flocs and the quantity of extracellular polymeric substances (EPS) in MBRs were also tested. The results show that large aeration intensity has a negative influence on the filterability of mixed sludge in MBR. Further research finds that the large aeration intensity results in the increase of soluble microbial products (SMP) with a relative molecular mass (Mr)>10 000 in supernatant, which obviously affects the filtration of mixed sludge. It is also found that small particles in the range of 1-10 μm and the concentration of EPS in flocs remarkably increase under high aeration intensity of 500 Ｌ/h. |
