Pretreatment of cyclohexanone manufacturing wastewater
by iron-carbon micro-electrolysis
Dongwei Li1,2,﹡,Binquan Jiao1,2,Xiaoman He1
1College of Resource and Environmental Science,Chongqing University,Chongqing 400044, P.R.China,2 The Key Laboratory of the Exploitation of Southwest Resources & the Environmental Hazards Control Engineering,Ministry of Education,Chongqing 400044,P.R.China
Abstract:On the base of iron-carbon micro-electrolysis treatment technology, an important cyclohexanone manufacturing wastewater pretreatment technology was presented. The chemical oxygen demand (COD) of the wastewater is 30000~40000mg/L, the chromaticity is 500~1024 times and the initial pH is 2~4.The three factors, iron-carbon quality ratio, the initial pH of inflow and reaction time, were investigated through experiments. The optimal qualification of solution of iron-carbon micro-electrolysis and removal efficiency of COD were determined. The experimental results show that the removal rate of COD can reach 55.35% for the wastewater at optimal pH of 2~3 after 4 hours pretreatment with air release. Pretreatment can improve the biochemistry availability of the wastewater. As shown in the gas chromatography of outflow, pretreatment can split organic molecules into simpler ones.