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对比研究了化学混凝(chemical coagulation,CC)与电絮凝(electrocoagulation,EC)作为超滤膜分离的预处理工艺,在死端过滤条件下与超滤膜的作用机制以及对膜污染的减缓效果.主要研究了Al3+投加量对膜通量、絮体性质(粒径、强度系数、恢复系数、分形维数)、以及滤饼层性质的影响.结果表明,EC作为预处理时,生成的絮体强度大且结构紧实,在膜表面堆积形成的滤饼层具有疏松多孔、亲水性强的性质;而CC作为预处理时,生成的絮体强度低且比较松散,在膜过滤过程中容易被压力压碎压实,导致滤饼层比较密实、亲水性低.因此,EC作为预处理工艺对膜污染的减缓效果好,在运行过程中可以保持较高的膜通量,膜通量较CC高约5.57%.
The effects of chemical coagulation (CC) and electrocoagulation (EC) on the pretreatment of ultrafiltration membrane were compared. The mechanism of membrane coagulation and membrane fouling mitigation under dead-end filtration The effects of Al3 + dosage on membrane flux, floc properties (particle size, strength coefficient, recovery coefficient, fractal dimension) and cake properties were studied.The results showed that EC as a pretreatment The floc strength and compact structure, the cake layer formed on the membrane surface has loose porous, hydrophilic nature; and CC as a pretreatment, the resulting floc strength is low and relatively loose, in the membrane filtration process Is easily crushed and compacted by pressure, resulting in a dense cake layer and low hydrophilicity, therefore, the mitigation effect of EC as a pretreatment process on membrane fouling is good and a high membrane flux can be maintained during operation The flux is about 5.57% higher than CC.