生物炭-甲烷氧化菌-黏土覆盖层的甲烷去除效能  

Methane removal efficiency in biochar-methanotroph-clay landfill cover

作　　者：孙文静 孙高格 张舒芸 SUN Wenjing;SUN Gaoge;ZHANG Shuyun(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Shanghai BaiTong Project Management Consulting Co.,Ltd.,Shanghai 200127,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]上海百通项目管理咨询有限公司,上海200127

出　　处：《岩土工程学报》2024年第12期2529-2537,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(41977214);浙江工贸职业技术学院科研平台开放课题(Kf202202)。

摘　　要：垃圾填埋场是全球重要的甲烷排放源,是控制甲烷逸散的重要措施。然而传统覆盖层的“闭气”性较差,甲烷气体长期无组织、低强度地经覆盖层逃逸至大气中,加剧温室效应。研究由生物炭搭载甲烷氧化菌并掺入黏土中,构造生物炭-甲烷氧化菌-黏土生态型覆盖层,旨在协同生物炭吸附和微生物氧化作用增强覆盖层甲烷去除效能,以期实现更加经济、持续、有效地减排逃逸甲烷气体。采用化学氧化老化法和水膜转移法等,共开展48组甲烷去除试验,分析生物炭掺量、氧化老化次数和充甲烷培养天数对混合土甲烷去除效能的影响。结果表明:甲烷去除效能随生物炭掺量增加先增强后减弱,随老化次数和充甲烷培养天数增加而逐渐增强;5%生物炭掺量的黏土经6次氧化老化且甲烷氧化菌经30d充甲烷培养后,混合土的甲烷去除效能最佳,去除量达14.05mg/g,是纯黏土甲烷去除量的两倍之多。研究结果为生物炭-甲烷氧化菌-黏土生态型覆盖层系统的设计、施工和服役维护提供指导。The landfill is one of the main sources of methane emissions.The landfill cover is at the top of a landfill as an important solution to reduce methane release.However,the gas closure capability of the conventional landfill cover is so poor that results in prolonged issue of uncontrolled,low-intensity methane emissions and exacerbates the greenhouse effects.In this study,the biochar and methanotroph amendment to clay are proposed to create an eco-friendly landfill cover,biocharmethanotroph-clay(BMC)cover.It is designed to combine the absorbing or oxidizing methane capabilities of biochar and methanotroph,aiming for more economical,sustainable and effective methane removal approach.By adopting chemical oxidation aging method,water film transfer method and other methods,a total of 48 groups of experiments are conducted to stimulate the effects of biochar content,oxidation aging times and methane-filled days to the methane removal efficiency of the BMC.The results indicate that the methane removal efficiency increases first and then decreases with the increase of the biochar content.It increases gradually with the increase of the oxidation aging times and methane-filled days.After 6 times of oxidation aging and 30 days of breeding methanotroph,the BMC with the biochar content of 5%shows the highest methane removal capacity amounting to 14.05 mg/g,which is more than twice the number of the clay.These results are expected to offer insights for the design,construction and maintenance of the BMC landfill cover system.

关 键 词：垃圾填埋场 覆盖层 生物炭 甲烷氧化菌 氧化老化 

分 类 号：TU411[建筑科学—岩土工程]