聚硅酸硫酸铁/壳聚糖复合絮凝剂的制备及其在废水处理中的应用

摘要

An inorganic polymeric composite flocculant polyferric silicate sulfate ( PFSS) and assistant flocculant chitosan ( CTS) have been prepared. Factors that influence the synthesis and applications of the flocculants have been investigated. The composition, dosage and pH value have been discussed in terms of treating the municipal wastewater. The optimal conditions of synthesis and application have been achieved by the flocculation test of simulated wastewater and municipal wastewater. The results show that the molar ratio of Fe/Si is 1, the basicity of PFSS is 1.5, pH of the polyferric sulfate (PFS) is 2, the activating time of the polysilicate (PS) is 1. 5 h; the mass ratio of PFSS/CTS is 5∶1, the dosage is (20 + 4) mg/L, the range of pH is 6 to 9, the sedimental time is 15 min. The turbidity, chromaticity, and COD removing rate of composite flocculant PFSS-CTS reached 95. 04％ , 91. 26％ , and 83.45％ , respectively, under optimized conditions.%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%.