螯合絮凝沉降法从含镉水中除镉的研究

以聚丙烯酰胺絮凝剂为骨架，以二乙烯三胺为接枝螯合基团，在甲醛参与下，依据Mannich反应，制得螯合基团接枝絮凝剂CFA。研究了CFA在模拟含镉废水中除镉的效率，结果表明，在pH5～8范围，絮凝剂用量为15mL／L的常温条件，经两级絮凝处理可将浓度为10mg／L的Cd2＋降至0．087mg／L，去除率达99．1％，能够满足各工业废水排放标准。

Study on the sedimentation removal of cadmium from cadmium contained water by method of chelate-flocculation

The chelate-ftocculant was prepared using polyacrylamide （PAM） as skeleton, diethylenetri- amine （DETA）as chelation group to be grafted, and formaldehyde joining in, by the Mannich reaction. The performance of cadmium （ Ⅱ ） removal from aqueous solution was investigated. The results show that the waste water of 10 mg/L cadmium concentration, the rate of removing cadmium can be above 99.1% by following conditions： the adding flocculant concentration is 15 mL/L; the pH of wastewater range of 5 - 8 ; and room temperature. Moreover, after removing cadmium by secondary flocculation, concentration of cad- mium in the water can fall to below 0. 087 rag/L, that the treated water have reached the national standard for waste water to be released to rivers.