SMSBR中PAC对膜污染的防治作用

在SMSBR处理焦化废水的过程中，通过向反应器中投加粉末活性炭（PAC）进而形成生物活性炭（BAC）来实现对膜污染的防治，并通过对BAC污泥的终端过滤来反映其对膜污染的改善作用。试验结果表明，BAC污泥在终端过滤过程中，其相对通量的变化规律与普通活性污泥相同，但投加PAC后的膜通量明显提高。另外，在相同压力下普通活性污泥的通量衰减指数要远高于BAC污泥，而在相同PAC浓度下BAC污泥的通量衰减指数随压力的变化与普通活性污泥一样，未表现出一定的规律性。BAC污泥的阻力分布表明，沉积层阻力仍占有绝对优势（大于80％），并随压力的升高而增大，但与普通活性污泥相比该比例有明显下降，膜的固有阻力所占比例明显提高，体现了PAC对膜污染的防治作用。

Effect of PAC on Control of Membrane Fouling in Coke Wastewater Treatment by Submerged Membrane Sequencing Batch Reactor

In coke wastewater treatment by submerged membrane sequencing batch reactor (SMSBR), membrane fouling was controlled by addition of powdered activated carbon (PAC), which was expected to change activated sludge into biological activated carbon(BAC) sludge so as to decrease the membrane fouling through dead-end filtration. The experimental result showed that in the process of dead-end filtration, the relative flux of both BAC and conventional activated sludge (CAS) is changed in the same regularity, but after addition of PAC, BAC sludge shows higher relative flux. Furthermore, under the same pressure, the flux of CAS show much higher decline index than that of BAC sludge, while at the same concentration of PAC, the flux decline index of BAC sludge is varied with pressure, which shows no regularity. Based on the resistance distribution of BAC sludge, the cake resistance of BAC sludge makes up above 80% and is increased along with the rising of filtration pressure, but it is lower than that of CAS. The difference between them shows the effect of PAC on the control of membrane fouling.