Study On The Coking Wastewater Using Iron-Carbon Inside-Electrol Yzation Method

Systematic analysis of the varieties and characteristics of the coking wastewater was conducted. Based on the experience of practical projects, we found that it was unfeasible to treat the coking wastewater only with biological methods, It even caused the death of sludge. Considering higher CODCr, complex composition and recalcitrant organic compounds in coking wastewater and effectiveness and ease in operation of sider-electrolysis, an schemes of sider-electrolysis preoperate method was established.1.Some technology control-factors are studied through orthogonal experiment to study their impact on treating effect. The pH value, reaction time, the ration of Fe/C are chosen as control factors. COD_Cr, NH₃-N and color are indicating indexes for estimating treating effect. The result shows that effecting order is pH value, the ration of Fe/C and reaction time. The lower the pH value is, the longer the retention time is, and the closer to 1 of the rationon of Fe/C is, the better the efficiency is. Generally, the removal rate of COD_Cr and colors are respectively 69.9% and 90%. The biogradability of effluent is improved and the toxicity is reduced. It achieves the goal of pretreating.And on the basis of the orthogonal experiments ,conducting the mono-factor test to each of the factors.The optimization were determined to be:initial pH value:5.0;the ration of the Fe/C:1:1.5;the react time:80(min).And optimum experiment was carried out on this condition, the efficiency goes to...