中文摘要：

采用共聚法制备不同硅铁摩尔比n（Si）/n（Fe）的复合硅铁（PSF）混凝剂,考察n（Si）/n（Fe）对PSF混凝效果的影响及影响机制,同时对比研究PSF与聚合氯化铝（PAC）对黄河水的混凝效率。结果表明：对于黄河水,n（Si）/n（Fe）为0.5-1时,其浊度和CODMn的去除率分别下降3.2%及3.8%;n（Si）/n（Fe）为1-3时,其浊度和CODMn的去除率明显增大;铁和硅的相互抑制或相互促进有一个极限配比,n（Si）/n（Fe）只有在极限配比附近才能充分发挥铁硅的复合作用,提高混凝效果;PSF处理黄河水的最佳投药量低于PAC,在实验投药量范围内PSF对CODMn的去除率比PAC高约5%-19%。

英文摘要：

Poly-silicic-ferric（PSF） coagulant with various Si-Fe mol ratios（n（Si）/n（Fe）） was prepared by copolymerization.The influence of Si-Fe mol ratio on both coagulation efficiency and influence mechanism of PSF was investigated.The coagulation efficiency using PSF as coagulant in treating water from Yellow River in comparison with that using Polyaluminium chloride（PAC） as coagulant was studied.The results show that the removal of turbidity and CODMn for water from Yellow River reduces by 3.2% and 3.8% when n（Si）/n（Fe） varies from 0.5 to 1,the removal of turbidity and CODMn increases when n（Si）/n（Fe） varies from 1 to 3.The relative amount of Si or Fe in PSF has a limit ratio.PSF can give the optimum complex action of Si and Fe only at the optimum n（Si）/n（Fe） ratio range which is near the limit of n（Si）/n（Fe） ratio.PSF has lower optimum dose in treating water from Yellow River than PAC,giving more CODMn removal of 5%-19% or so than PAC at given dose range.