不同混凝剂对各种超滤膜跨膜压力的影响

Influence of different coagulants on transmembrane pressure

采用聚合氯化铝和三氯化铁作为混凝剂,应用于浸入式PVDF膜、外压柱式PVDF膜和内压柱式PVC合金膜的混凝预处理。结果表明:对于PVDF膜,采用铝盐能够较好地减缓跨膜压力的升高趋势,对于PVC合金膜,采用铁盐作为混凝剂效果较好。混凝剂的选择主要考虑膜的材质,对膜的运行方式可以较少考虑。

Polyaluminium chloride and ferric chloride were used as coagulants in the pretreatment with submerged PVDF membrane,external-compression column PVDF membrane and internal-compression column PVC alloy membrane.The result shows that polyaluminium chloride enables to slow down the increasing tendency of transmembrane pressure(TMP)for PVDF column membrane,and for PVC alloy membrane better performance is obtained with ferric chloride.In the selection of coagulant,more attention will be paid to the material of membrane rather than operation of membrane.