A systematic study of soluble microbial products and their fouling impacts in membrane bioreactors
A systematic study of soluble microbial products and their fouling impacts in membrane bioreactors
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DOI：
10.1016/j.cej.2011.01.090
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发表时间：
2011-04
影响因子：
15.1
通讯作者：
Yu Tian;Lin Chen;Sai Zhang;Shuai Zhang
中科院分区：
文献类型：
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作者：
Yu Tian;Lin Chen;Sai Zhang;Shuai Zhang
通过一系列搅拌死端过滤试验，研究了生物质相关产物（BAP）和利用相关产物（UAP）的污染潜力，结果表明，UAP具有较高的改性污染指数，其值为1.63× 104 s/L2。蛋白质主要积累在UAP中，占45.3%，而BAP中蛋白质的比例仅为12.1%。由于膜的截留作用，UAP和BAP的透过液浓度大大降低：蛋白质降至接近零，多糖被有效截留，截留率为26.6%~ 46.8%。激发-发射矩阵分析表明，类腐殖酸和富里酸类化合物的保留比蛋白质低。通过傅里叶变换红外光谱对膜污染物的观察表明，膜污染物主要是蛋白质和多糖。模拟结果表明，BAP和UAP的主要污染机理分别为滤饼过滤和完全堵塞，进一步证实了UAP比BAP具有更高的污染潜力。
A series of stirred dead-end filtration tests were conducted to investigate the fouling potential of BAP (biomass-associated products) and UAP (utilization-associated products), showing that UAP had higher modified fouling index with a value of 1.63×104s/L2. Proteins were mainly accumulated in UAP and accounted for 45.3%, while the proportion of proteins in BAP was only 12.1%. Due to the membrane interception, the permeate concentrations of UAP and BAP decreased largely: proteins decreased to near zero and polysaccharides were effectively retained ranging from 26.6% to 46.8%. Excitation–emission matrix analysis showed that humic-like and fulvic-like compounds had lower retention than proteins. The observation of fouled membrane by Fourier transform infrared spectroscopy demonstrated that membrane foulants were dominated by proteins and polysaccharides. Modeling work well indicated that the main fouling mechanisms for BAP and UAP filtration were cake filtration and complete blockage, respectively, further confirming that UAP had higher fouling potential than BAP.