改性淀粉絮凝剂在选矿废水处理中的应用

摘要

This paper used the starch as the raw material to prepare three different kinds of flocculants which are acrylamide-grafted starch, starch phosphate and cationic starch ether.Treating the wastewater using the flocculants, the influences of dosage, pH value and temperature on flocculating performance were studied taking the suspended solids concentration, COD removal efficiency and removal rate of Cu2+ as indexes.Result showed that when the dosage of the acrylamide-grafted starch was 6mg/L, the pH value was 7~9 and the temperature was 25 ℃, the best result was gotten.When the dosage of starch phosphate was 12mg/L, the pH value was 7 and the temperature was 25~35 ℃, the best result was gotten.When the dosage of cationic starch ether was 14mg/L, the pH value was 7 and the temperature was 25~35 ℃, the best result was gotten.The acrylamide-grafted starch could get the best treatment effect, while the cationic starch ether followed and the starch phosphate gained the last name.%本文以淀粉为原料,制备了丙烯酰胺接枝淀粉、淀粉磷酸酯、阳离子淀粉醚3种不同类型的改性淀粉絮凝剂,分别用其处理某铜矿附近河水,以固体悬浮物浓度、COD去除率、除铜率为指标,研究絮凝剂用量、pH值和温度对絮凝性能的影响.结果表明,当丙烯酰胺接枝淀粉用量为6mg/L、体系pH值为7~9、温度为25 ℃,淀粉磷酸酯用量为12mg/L、体系pH=7、温度为25~35 ℃,阳离子淀粉醚用量为14mg/L、体系pH=7、温度为25~35 ℃时,处理效果最佳;丙烯酰胺接枝淀粉能够起到更好的絮凝效果,阳离子淀粉醚次之,淀粉磷酸酯最弱.