Department of National Defence Architecture Planning & Environmental Engineering, Logistic Engineering University, Chongqing 401331, China.
School of Environment, Tsinghua University, Beijing 100084, China.
Sci Total Environ. 2018 Apr 1;619-620:232-238. doi: 10.1016/j.scitotenv.2017.11.002. Epub 2017 Nov 14.
Three different hollow-fibre ultrafiltration (UF) membranes were applied to treat upflow biological activated carbon (UBAC) effluent to determine the characteristics of membrane biofouling by microorganisms and particles. At the beginning of filtration, the cake layer formed on the membrane was loose and highly compressible, and the trans-membrane pressure (TMP) rapidly increased. When compressed to a certain extent, cake layer with low compressibility was formed by the accumulated particles and resulted in slower TMP increment. Thus, the decreased compressibility of the cake layer formed on the UF membrane during filtration of UBAC effluent led to the rapid increase in TMP at the beginning and slow increment in subsequently. The results were confirmed by filtering Escherichia coli, Staphylococcus aureus and kaolinite mixed suspensions with flat-sheet UF membrane. Our findings provide a new insight into membrane biofouling control and may facilitate better membrane application in drinking water treatment.
三种不同的中空纤维超滤（UF）膜被应用于处理上流式生物活性炭（UBAC）出水，以确定微生物和颗粒对膜生物污染的特性。在过滤开始时，膜上形成的滤饼层疏松且高度可压缩，跨膜压力（TMP）迅速增加。当压缩到一定程度时，由积累的颗粒形成具有低压缩性的滤饼层，导致 TMP 增加速度较慢。因此，UBAC 出水中 UF 膜过滤过程中滤饼层的可压缩性降低，导致 TMP 在开始时迅速增加，随后增加缓慢。这一结果通过用平板 UF 膜过滤大肠杆菌、金黄色葡萄球菌和高岭土混合悬浮液得到了证实。我们的发现为膜生物污染控制提供了新的见解，并可能有助于更好地将膜应用于饮用水处理。
