第 49 卷第 4 期 Vol. 49 No. 4 2019 年 8 月 Aug 2019

所属栏目：安全与环保 ZnSO4絮凝-电催化氧化组合工艺预处理甲基托布津生产废水

马 林1，2，张 燕1，2，陈 灿1，2，秦岳军1，2，干兴利1，2，刘 欢1，2，钟若楠1，2，张海涛1，2 （1. 湖南化工研究院有限公司 国家农药创制工程技术研究中心，湖南 长沙410014；2. 农用化学品湖南省重点实验室，湖南 长沙 410014）

摘　要：采用ZnSO4絮凝-电催化氧化组合工艺预处理甲托生产废水，探讨了ZnSO4固体投加量、絮凝沉淀时间对甲托混水COD去除效果。在ZnSO4投加量为3‰，絮凝沉淀时间为30 min时，甲托混水的COD由24 100 mg·L-1降至15 482 mg·L-1，COD去除率为36%。ZnSO4絮凝沉淀后，将滤液电催化氧化，重点考察了投加复合催化剂、电解电流、电解时间对电催化氧化的处理效果。投加复合催化剂后，形成三维电催化氧化，传质效率大大提高，能耗降低。在电解电流为10 A，电解时间为4 h条件下，电催化氧化处理后，COD降至7 200 mg·L-1，COD去除率达到70%，B／C提高至0.41，废水可生化性大幅提高。

关键词：ZnSO4絮凝；电催化氧化；甲托生产废水

中图分类号：X703　　文献标识码：A　　文章编号：1009-9212（2019）04-0059-05

Pretreatment of Wastewater from Thiophanate-methy Production by a Process of ZnSO4 Flocculating Combined with Electrocatalytic Oxidation

MA Lin1,2, ZHANG Yan1,2, CHEN Can1,2, QIN Yue-jun1,2, GAN Xing-li1,2, LIU Huan1,2, ZHONG Ruo-nan1,2, ZHANG Hai-tao1,2 (1. National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, China; 2.Hunan Province Key Laboratory for Agrochemicals, Changsha 410014, China)

Abstract：Based on electrocatalytic oxidation, wastewater from thiophanate-methyl production was pretreated by a process of ZnSO4 flocculating combined with electrocatalytic oxidation. The proportion of ZnSO4 and the time of flocculation precipitation were investigated. The results showed that under the ZnSO4 addition of 3‰ and a flocculation precipitation time of 30 min, COD of wastewater was reduced from 24 100 mg·L-1 to 15 482 mg·L-1, and the COD removal rate was 36%. After ZnSO4 flocculating precipitation, the filter was oxidized electrically catalyzed. The addition of composite catalyst, electrolysis current, and electrolysis time were investigated. With the addition of composite catalyst, three-dimensional electrode electrocatalytic oxidation formed, and mass transfer efficiency was greatly improved, and energy consumption was reduced. The electrolysis current of 10 A, and electrolysis time of 4 h were the electrocatalytic oxidation's best conditions. Under these obtained best conditions, COD was dropped to 7 200 mg·L-1, COD removal rate reached 70%, B/C increased to 0.41. The bioavailability of thiophanate-methyl wastewater increased significantly.

Key words：ZnSO4 flocculation precipitation; electrocatalytic oxidation; thiophanate-methyl wastewater

作者简介：马 林（1985-），女，湖南桃源人，助理研究员，硕士，研究方向：污水处理与水污染控制工程（E-mail：matiee6666@163.com）。

收稿日期：2019-07-18