Study on Treatment of Landfill Leachate by Electrochemical, Flocculation and Photocatalysis

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Yang, Yue^1 ; Jin, Xiuping^1 ; Pan, Yunbo^1 ; Zuo, Xiaoran^1

School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing

100081, China^1

关键词: COD removal rate;    Electrolysis time;    Electrolysis voltages;    Flocculation process;    Landfill leachates;    Light irradiations;    Optimal conditions;    Optimal treatment;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/4/042041/pdf
DOI  :  10.1088/1755-1315/108/4/042041

来源: IOP

【 摘 要 】

In this study, the landfill leachate of different seasons in Liaoyang City is as the research object, and COD removal rate is as the main indicator. The electrochemical section's results show that the optimal treatment conditions for the water of 2016 summer are as follows: voltage is 7.0V, current density is 40.21 A/m2, pH is equal to the raw water, electrolysis time is 1h, and the COD removal rate is 80.41%. The optimal treatment conditions for the 2017 fall's water are: electrolysis voltage is 7.0 V, current density is 45.06 A/m2, electrolysis time is 4 hours, and COD removal rate is 28.03%. The flow rate of continuous electrolysis is 6.4 L/h using the water of 2016 fall, and the COD removal rate is 10.28%. The results of the flocculation process show that the optimal treatment conditions are as follows: pH is equal to the raw water; the optimal flocculant species is Fe-Al composite flocculant, wherein the optimal ratio of Fe-Al is n (Fe):n (Al)=0.5:1; the best dosage of flocculant is 2.0 g/L and COD removal rate is of 21.11%. The results of photocatalytic show that the optimal conditions are: pH is 4.5, Al2(SO4)3is 1.0 g/L, FeSO4.7H2O is 700mg/L, H2O2(30%) is 4 mL/L, stirring and standing UV lamp light irradiation 3 hours, and adjusting pH to 6.0 or so, COD removal rate is 36.15%. +