Zhang Hai-Feng, Sun Bao-Sheng, Zhao Xin-Hua, Xu Yan-Hong, Qi Geng-Shen
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Huan Jing Ke Xue. 2008 Oct;29(10):2777-82.
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 (M(r)) > 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 microm and the concentration of EPS in flocs remarkably increase under high aeration intensity of 500 L/h.
研究了曝气强度对膜生物反应器（MBR）中膜污染的影响。两个实验室规模的MBR，曝气强度分别为500 L/h和100 L/h，在恒定的渗透通量下运行60天。进行死端过滤试验以确认每种条件下混合污泥的过滤性能。还测试了曝气强度对MBR中溶解性微生物产物（SMP）的相对分子质量分布、絮体的粒径分布（PSD）和胞外聚合物（EPS）含量的影响。结果表明，曝气强度大会对MBR中混合污泥的过滤性能产生负面影响。进一步研究发现，曝气强度大会导致上清液中相对分子质量（M(r)）>10000的可溶性微生物产物（SMP）增加，这明显影响混合污泥的过滤。还发现，在500 L/h的高曝气强度下，1-10微米范围内的小颗粒和絮体中EPS浓度显著增加。
