Effect and cost of coagulation combined with Fenton for leachate treatment
混凝与Fenton联用处理垃圾渗滤液的效能及成本

In order to compare treatment effect and costs of coagulation/Fenton process and Fenton/coagulation process on leachate treatment, young leachate and old leachate were separately treated by the two techniques. The experimental results indicate that highest COD removal of Fenton reaction on leachate can be acquired under the conditions of pH=3.5, nH2O2/nFe2+=6, mH2O2/mCOD=3, reaction time=4 hours. The experimental results also indicate that PAC coagulation has the highest COD removal on leachate under the condition of mPAC/mCOD=0.6. Under the optimum reaction conditions, coagulation/Fenton process and Fenton/coagulation process were separately adopted to treat raw leachate. The experimental results indicate that COD removal of coagulation/Fenton process on the young leachate and the old leachate are 90.56% and 86.56% separately; COD removal of Fenton/coagulation process on the young leachate and the old leachate are 89.99% and 85.99% separately, no obvious difference. But the cost of coagulation/Fenton process for leachate treatment is lower 62.6 yuan/t than the cost of Fenton/coagulation process at least; therefore, coagulation/Fenton process is more optimized than Fenton/coagulation process for leachate treatment.