制备了无机高分子复合絮凝剂聚硅酸硫酸铁(PFSS)和助凝剂壳聚糖(CTS),考察了影响合成及絮凝剂应用的因素,探讨了其组成、投加量以及pH值对城市废水絮凝效果的影响,通过对模拟废水和城市废水絮凝试验,得出最佳的合成和应用条件:n(Fe):n(Si)=1:1,PFSS的碱化度为1.5,聚合硫酸铁(PFS)的pH=2,聚硅酸(PS)的活化时间为1.5 h;n(PFSS):n(CTs)=5:1,投加量为(20+4)mg/L,pH值的范围为6～9,沉降时间为15 min.复合絮凝剂(PFss-CTS)在最佳条件下浊度、色度、COD的去除率分别达到95.04%、91.26%和83.45%.
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