Study on Treating Thiram and Ziram Wastewater by Improved Electric-Fenton Process

Abstract

Thiram and Ziram wastewater is a type of pesticide wastewater with high COD, high ammonia nitrogen and unpleasant odor. In this paper, Fenton, iron-carbon, micro-electrolysis, Electro-Fenton and other methods were used to treat theThiram and Ziram wastewater, the Electro-Fenton process is best. And the improved Electro-Fenton plant was used treat wastewater to explore the impact of pH, current density, packing ratio and amount of filler on the removal efficiency of COD. The optimal operating conditions with low processing cost and high removal efficiency were determined. The results showed that the COD removal efficiency of the modified Electro-Fenton process for the treatment of the ThiramandZiram wastewater was increased from 52.96% to 75.62%.Based on the result, the higher current density and the more the filler content, the higher the removal efficiency. The optimumH is 3, optimumiron-carbon ratio is 1 to 2.