Lin Hong-jun, Lu Xiao-feng, Duan Wei, Shen Fei
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
Huan Jing Ke Xue. 2006 Dec;27(12):2511-7.
Filtration characteristics and mechanism of membrane fouling were investigated with MBR mixed liquor. It was found that, the variation of filtration resistance was fit to the standard blocking filtration model in initial process, and then fit to cake filtration model in later process. In dead-end filtration of sludge, the relative flux was in the tendency to the exponential decay along with filtration time, and flux was decreased more quickly at higher pressure. Sludge was compressed during filtration process, and resistance of sludge was increased with the increase in filtration pressure, the compressibility index was obtained as 0.807 8. Quantitative calculations showed that cake resistance made up over 90% of total resistance. In addition, the relative contribution of each of the sludge fractions to membrane was respectively calculated as 87.98 % for suspended solids, 6.20 % for colloids and 5.82% for solutes. Then a possible mechanism underlying membrane fouling was proposed.
采用膜生物反应器（MBR）混合液研究了过滤特性及膜污染机理。研究发现，过滤阻力的变化在初始阶段符合标准阻塞过滤模型，而在后期符合饼层过滤模型。在污泥的死端过滤中，相对通量随过滤时间呈指数衰减趋势，且在较高压力下通量下降更快。过滤过程中污泥被压缩，污泥阻力随过滤压力的增加而增大，压缩指数为0.807 8。定量计算表明，饼层阻力占总阻力的90%以上。此外，分别计算了各污泥组分对膜的相对贡献，悬浮固体为87.98%，胶体为6.20%，溶质为5.82%。进而提出了膜污染的一种可能机理。
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