电镀废水膜法回用后浓水达标处理研究

本文对电镀废水经物化预处理--反渗透回收处理后的膜浓废水作为对象,将微电解--芬顿破反应处理方法作为破络合反应,对重金属、COD的去除方法进行了研究,确定了pH4,双氧水加药量3‰,反应时间60 min,是比较好的破络合反应条件;经破络处理后的废水中,进行pH调节后,投加硫化钠浓度50 mg/L,重金属捕捉剂10 mg/L可以将反渗透膜浓水中较低浓度的重金属及COD处理至国家排放标准。

STUDY ON THE ELECTROPLATING WASTEWATER BY CONCENTRATED WATER OF MEMBRANE PROCESSING

Abstract： In this paper, the electroplating wastewater treated by physical-chemical pretreat- ment and reverse osmosis （RO） processing. The heavy metals and COD removal method of RO concentrated water which broken-complexation by micro-electrolysis fenton reaction has been researched. The results showed that the best conditions of broken-complexation are pH 4, hy- drogen peroxide dosage 3 %o and the reaction time 60 min. After the processing of broken- eomplexation reaction, pH adjusting and dosing 50 mg/L sodium sulfide and 10 mg/L heavy metal capture agent, the RO concentrated water which has low concentration of heavy metals and COD reaches the national emission standard