A novel tap water flocculant was prepared under volume proportion of 0.1% PAC : 0.01% PS : 3% MS = 30 : 6 : 7. Compared with traditional chemical flocculant poly aluminum ferric chloride (PAFC), the turbidity in water-exit treated by the novel flocculant was decreased by 3.35%, aluminum ion content and medicament cost were decreased by 56.17% and by 5.42%,respectively . The performance-price ratio of this composite flocculant was higher than that of traditional flocculants. This flocculant had great effect on decreasing concentration of Al3+, which in water-exit was only 0.071 mg/L, lower than our nation quality standards of tap water (0.2 mg/L, GB5749-2006). This novel composite flocculant is safer than conventional flocculants. So it has important significance of extending and application in the tap water treatment.%用聚合氯化铝( PAC)、多糖(PS)和改性淀粉(MS)为主要组分制备出自来水复合絮凝剂,其最佳体积配比为质量分数0.1％的PAC:质量分数0.01％的PS:质量分数3％的MS=30:6:7.与传统自来水絮凝剂聚合氯化铝铁( PAFC)相比,该复合絮凝剂处理原水后的出水浊度下降3.35％,铝离子含量下降56.17％,药剂成本下降5.42％.性价比优势明显,特别是在降低铝离子浓度方面效果显著.出水铝离子浓度仅为0.071mg/L,远低于我国自来水铝离子浓度0.2 mg/L的出水标准,使自来水更加安全,在我国自来水处理领域具有重要的推广应用价值.
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