SMSBR处理焦化废水的膜污染机理研究

在采用SMSBR处理焦化废水的过程中，通过对污泥进行终端过滤来反映膜污染机理，着重考察了过滤过程中的阻力分布，并通过标准堵塞过滤定律和沉积过滤定律来拟合膜过滤过程，从而确定了膜污染的控制因素。污泥的阻力分布试验表明，沉积阻力占总阻力的90％以上，并随压力的升高而增大，而内部污染阻力所占比例最小；污泥的终端过滤过程严格符合沉积过滤定律，即使在过滤初期也不受堵塞过滤的控制，这与阻力分布的结果相对应；污泥在严格符合沉积过滤定律，即使在过滤初期也不受堵塞过滤的控制，这与阻力布的结果相对应；污泥在终端过滤过程中膜的相对通量随过滤时间呈指数衰减趋势，并在几分钟内就达到相对稳定值，且低压对应较高的相对通量，但通量衰减指数和压力之间没有相关性；污泥的压密指数为0．7015。

Mechanism of Membrane Fouling in Coke Wastewater Treatment by Submerged Membrane Sequencing Batch Reactor

In coke wastewater treatment by submerged membrane sequencing batch reactor (SMSBR), the mechanism of membrane fouling was studied by means of dead-end filtration of activated sludge. The study focused on the resistance distribution in filtration and the use of standard blocking filtration law and cake filtration law to fit in with the membrane filtration, and thus determining the factors that control the membrane fouling. The test on resistance distribution showed that the cake resistance makes up over 90% of total resistance and is increased with the rising of pressure, while the internal fouling resistance has the least proportion. The dead-end filtration of sludge is in strict conformity with the cake filtration law and is not controlled by blocking filtration even in the initial filtration period. It corresponds to the resistance distribution. In dead-end filtration of sludge, the relative flux is in the tendency to the exponential decay along with filtration time and achieves the relative stability index in a few minutes. Furthermore, the low pressure is in correspondence with the higher flux, however, there is no correlation between decay index of flux and pressure; the compressibility index of sludge is 0.701 5.