4.2 Article

Performance of Biocover Materials in Mitigating Methane Emissions from Landfills under Different Loading Rates

期刊

出版社

ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/JOEEDU.EEENG-7244

关键词

Landfills; Methane; Climate change; Biocover; Yard waste; Food waste

向作者/读者索取更多资源

Biocovers are effective in reducing methane emissions from landfills, with food and yard waste compost materials showing promising results. However, peat moss did not provide suitable conditions for methane oxidation. The study highlights the importance of oxygen penetration depth and gas saturation in determining methane oxidation capacity, and suggests that biocover materials have great potential for reducing methane emissions, especially in older and smaller landfills.
Biocovers are an innovative solution to reduce methane (CH4) emissions from landfills. This study investigates the performance of biocover materials, including food waste compost, yard waste compost, and peat moss, in mitigating methane emissions through laboratory column experiments that applied different CH4 loading rates. The biocovers studied were 500 mm thick and consisted of a 70:30 ratio by mass of compost (or peat) to sand. While food and yard waste composts effectively supported CH4 oxidation, the peat biocover failed to provide appropriate conditions for CH4 oxidation over the study period. A numerical model was validated and used to understand the properties, processes affecting CH4 oxidation, and optimal design of the biocover materials. The results indicated that the maximum simulated removal efficiency of CH4 was 81.1%-84.4% in food waste compost and yard waste compost, respectively, at the lowest experimental loading rate of 142 g m(-2) day(-1). As expected for the experimental conditions tested, the CH4 removal efficiency decreased when the methane loading rate increased. The CH4 removal efficiency was greater than 96.6% when the simulated loading rate was less than 96 g m(-2) day(-1), which reflects reported CH4 emissions rates at small and older landfills. The results demonstrate that the methane oxidation capacity is limited by oxygen penetration depth and the gas saturation profile, which affected the CH4 residence time at different loading rates. Also, the simulated model results showed that increasing the thickness of the biocover layer (greater than 500 mm) does not increase the amount of CH4 oxidized even with increasing residence time, due to limitations on O-2 ingress into the material. The study findings suggest that biocover materials such as yard and food waste compost materials have great potential for reducing CH4 emissions from landfills, especially older and smaller landfills.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.2
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据