用二氧化硫处理含铬废水

Treatment of Chromium Containing Wastewater with Sulfur Dioxide

采用二氧化硫作还原剂，处理高浓度大流量含铬废水，除铬效果良好。进水中六价铬含量为９０．０～４３０．８ｍｇ／Ｌ时，经还原、沉淀处理后，出水中六价铬含量均可达到排放标准。该工艺基本上实现了二氧化硫的闭路循环，排放尾气中二氧化硫含量＜１５ｍｇ／Ｌ。

SO 2 in the exhaust gas has been used as a reducing reagent in the treatment of large flow wastewater containing high concentration of Cr +6 ,achieving good chromium removal efficiency. When the concentration of Cr +6 in the influent is 90.0～430.8mg/L,its effluent concentration can meet the discharge standard after reduction and sedimentation treatment. This process is charaterized by essentially realizing the closed recirculation of SO 2, the concentration of SO 2 finally emitted into the air is less than 15mg/L.