In this paper, the chitosan was modified under the protection of nitrogen, based on ammonium persulfate and sodium bisulfite as the initiator, and acrylamide as the graft material. As a result, the grafted acrylamide copolymer (CAM) was prepared and used to treat tanning wastewater. And the optimal dosage of CAM in the treatment of chromium-containing wastewater, the suitable stirring time and speed, and the optimum pH value were determined. Results showed that the optimal dosage of CAM should be 2 mg · L-1 in the flocculation treatment of the wastewater, and when pH value was 7. 8, the stirring speed was 200 r · Min-1, the stirring time was 3 minutes, and the settlement time was 4 hours, the best flocculation result was got and the removal rate of Cr(IU )was 94%.%本文以过硫酸铵和亚硫酸氢钠为引发剂,在N2保护下,以丙烯酰胺为接枝物,对壳聚糖进行改性,制得了壳聚糖接枝丙烯酰胺共聚物(CAM),并将其应用于处理铬鞣废水.确定了以壳聚糖接枝共聚物在处理含铬废水中的最佳加入量,适宜的搅拌时间、搅拌速度和最佳pH值等条件.结果表明:对铬鞣废水进行絮凝处理时的CAM的最佳用量为2 mg(CAM)·L-1(废水),pH值为7.8时,搅拌速度为200r·min1,搅拌时间为3 min,沉降时间为4 h,其絮凝效果最好,Cr(Ⅲ)的去除率达到94％.
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