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铁盐预混凝对微滤膜污染的影响

Keywords: 混凝,微滤,腐植酸,Zeta电位,颗粒粒度,膜污染

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Abstract:

针对混凝-微滤工艺,为优化铁盐预混凝条件及揭示不同凝聚体特性对膜污染的影响,分析了三氯化铁(ferricchloride,FC)和聚合硫酸铁(polymericferricsulfate,PFS)在不同投加量(0.1、0.2、0.4、0.6mmol/L)和混凝pH(4.5、5.5、6.5、7.5)条件下对水中天然有机物-腐植酸的去除率和膜污染的影响规律.实验结果表明:当酸性pH4.5~5.5电性中和机理为主时,PFS低投药量(0.1~0.2mmol/L)凝聚体颗粒大而密实,膜过滤中通量下降缓慢,膜污染程度轻,此时聚铁水解产物的高电荷比单铁更有利于电中和;中性pH6.5~7.5卷扫混凝时,FC高投药量(0.4~0.6mmol/L)缓解膜污染的作用更明显,此时单铁水解产物卷扫混凝形成凝聚体的颗粒粒径更大.可见,混凝凝聚体颗粒大小与结构特性,是膜污染的直接影响因素,大而密实的颗粒有利于增加膜通量,同时提高出水水质.

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