通过对比研究单独超滤系统和粉末活性炭导入超滤膜系统(PAC leading-in UF)发现,投加PAC后通量下降趋势有所减缓,但并不能显著地减缓膜污染并获得高通量,说明PAC吸附的溶解性小分子有机物不是造成膜污染的主要因素,而是在膜表面形成了"次级膜".试验中发现导入系统可显著提高对天然水中腐殖酸的去除效果,去除率可达到94%.此外在导入系统投加钙盐后可明显改善膜污染,达到有效控制膜通量的下降趋势的目的.
By comparing the separate UF system and the PAC leading - in UF system, it was found that flux decline slowed down somewhat after adding PAC. But it could not alleviate membrane fouling and acquire high flux very significantly. So the dissolved organic of small molecular which was adsorbed by PAC was not a major factor which caused membrane fouling and they formed a "secondary membrane" in the membrane surface. The test found that PAC into the UF system helped to remove humic acid effectively. The removal rate of humic acid was about 94% . By putting the calcium ions into the PAC leading- in UF system, membrane fouling was effec-tively mitigated and the flux decline was controlled.
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