The influencing factors of targeted electric repair technology for HDPE membrane leakage in landfill
ZHU Ming-zhu1,2, YAO Guang-yuan1, LIU Yu-qiang1, XU Ya1, LIU Jing-cai1, HUANG Qi-fei1, YANG Yan-mei2
1. Research Institute of Solid Waste Management, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 2. School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Abstract：The timely repair of HDPE membrane leakage in landfill is an important means of environmental risk control, which is of great significance to prevent leachate from polluting groundwater and soil environment. In order to solve the problems of complex operation, high cost and security risks during the operation period and after closure of landfill, the single factor experiments on the main influencing factors such as electrode type, voltage, operation time, bentonite concentration and dispersant/bentonite dosage ratio were carried out so as to analyze their impacts on repair effect and explore the best technological. The results showed that the accumulation at the leakage (5mm diameter) possessed good repair effect with the permeability coefficient of 9.41×10-6 cm/s, when graphite electrode adopted, the control voltage was 50V, the shortest operation time was 2days, the optimal bentonite concentration was 10g/L, and dispersant/bentonite ratio was 30%. In addition, the mathematical characterization model between the Zeta potential of solution system and the permeability coefficient of accumulation at the leakage were established, which can provide basis for the application in practical scenarios. In order to meet the impermeability requirements, the permeability coefficient needs to reach1×10-6cm/s, the Zeta potential of the corresponding repair solution should be at least -42.11mV.
朱铭珠, 姚光远, 刘玉强, 徐亚, 刘景财, 黄启飞, 杨延梅. 填埋场HDPE膜漏洞靶向电动修补技术影响因素[J]. 中国环境科学, 2022, 42(10): 4696-4703.
ZHU Ming-zhu, YAO Guang-yuan, LIU Yu-qiang, XU Ya, LIU Jing-cai, HUANG Qi-fei, YANG Yan-mei. The influencing factors of targeted electric repair technology for HDPE membrane leakage in landfill. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4696-4703.
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