Woźniak Piotr, Gryta Marek
Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, ul. Pułaskiego 10, 70-322 Szczecin, Poland.
Membranes (Basel). 2024 Sep 28;14(10):210. doi: 10.3390/membranes14100210.
The commercial ultrafiltration tubular polyvinylidene fluoride (PVDF) (100 and 200 kDa) and polyethersulfone (PES) (4 kDa) membranes were applied for filtration of car wash wastewater. Intensive fouling was noticed, which caused an over 50% flux reduction during 3-5 h of the filtration process. This phenomenon was reduced by washing the membranes with an alkaline cleaning agent (pH = 11.5), which is used in car washes to remove insects. The filtration/membrane washing cycle was repeated many times to achieve stable operation of the membrane modules. It has been found that cyclic repeated washing did not deteriorate the performance of the membranes. Despite frequent cleaning of the membranes (every 5-7 h), irreversible fouling occurred, resulting in a 20% reduction in the initial permeate flux. However, the formation of a filter cake definitely improved the separation degree and, for the 200 kDa membranes, separation of the wastewater components was obtained as it was for the 4 kDa membranes, while, at the same time, the permeate flux was 5 times higher.
商用超滤管状聚偏二氟乙烯（PVDF）（100和200 kDa）及聚醚砜（PES）（4 kDa）膜用于洗车废水的过滤。发现有严重的污染现象，在过滤过程的3至5小时内通量下降超过50%。用洗车时用于去除昆虫的碱性清洗剂（pH = 11.5）清洗膜可减少这种现象。多次重复过滤/膜清洗循环以实现膜组件的稳定运行。已发现循环重复清洗不会使膜的性能变差。尽管频繁清洗膜（每5至7小时一次），仍发生了不可逆污染，导致初始渗透通量降低20%。然而，滤饼的形成确实提高了分离程度，对于200 kDa的膜，废水成分的分离效果与4 kDa的膜相同，同时渗透通量高出5倍。
