臭氧化对垃圾填埋场后期渗滤液的预处理研究

Study on pretreatment of landfill leachate in the later stage by ozone

应用自制微孔扩散式接触反应器,考察了不同pH条件下垃圾填埋场后期渗滤液的臭氧化预处理效果。结果表明,渗滤液初始pH值升高,臭氧利用率增大,垃圾渗滤液中COD、腐殖酸的去除速率加快;当初始pH为10时,经臭氧化处理120 m in后,模拟废水的BOD5/COD可从初始的0.17提高到0.36,改善了废水的可生化性,同时渗滤液的色度、浊度、腐殖酸和SS也有较高的去除率。

Ozone was taken to pretreat the landfill leachate in the later stage at different pH in a microporous transfer contact reactor specially designed. The experimental results showed that the utilization rate of ozone and the removal of COD and humic acid in leachate was improved as initial pH was increased. After 120 min ozonation at initial pH 10,the value of BOD5/COD of landfill leachate in the later stage was improved from 0.17 to 0.36, which reflected that the biodegradability of the landfill leachate had been improved markedly. At the same time, Fe^2＋/O3 can effectually remove the chroma,turbidity,humic acid and SS of leachate.