Spatial and temporal characteristics of elevated temperatures in municipal solid waste landfills
Spatial and temporal characteristics of elevated temperatures in municipal solid waste landfills
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DOI：
10.1016/j.wasman.2016.10.052
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发表时间：
2017-01-01
期刊：
影响因子：
8.1
通讯作者：
Thalhamer, Todd
中科院分区：
文献类型：
--
作者：
Jafari, Navid H.;Stark, Timothy D.;Thalhamer, Todd
废物容纳设施中的高温可能会造成健康、环境和安全风险，因为它们会产生有毒气体、压力、渗滤液和热量。特别地，MSW填埋场经历通常遵循指标进展的行为变化，例如，温度升高、气体成分变化、气体压力升高、渗滤液迁移增加、斜坡移动以及异常和快速的地表沉降。本文介绍了两个城市生活垃圾填埋场的案例研究，显示了这些指标的空间和时间推移的运动，并确定了四个区域，说明了正常的城市生活垃圾分解的温度升高的区域的过渡。空间分带为气体锋、温度锋和阴燃锋。天然气井口温度和CH4与CO2的比例被用来描绘正常MSW分解，气体前锋和温度前锋之间的边界。CH 4与CO2和一氧化碳浓度的比率沿着与沉降应变速率和地下温度一起被用来描绘阴燃锋。此外，井下温度可用于估计升高的温度的移动速率，这对于及时隔离和遏制升高的温度是重要的。(C)2016爱思唯尔有限公司版权所有
Elevated temperatures in waste containment facilities can pose health, environmental, and safety risks because they generate toxic gases, pressures, leachate, and heat. In particular, MSW landfills undergo changes in behavior that typically follow a progression of indicators, e.g., elevated temperatures, changes in gas composition, elevated gas pressures, increased leachate migration, slope movement, and unusual and rapid surface settlement. This paper presents two MSW landfill case studies that show the spatial and time-lapse movements of these indicators and identify four zones that illustrate the transition of normal MSW decomposition to the region of elevated temperatures. The spatial zones are gas front, temperature front, and smoldering front. The gas wellhead temperature and the ratio of CH4 to CO2 are used to delineate the boundaries between normal MSW decomposition, gas front, and temperature front. The ratio of CH4 to CO2 and carbon monoxide concentrations along with settlement strain rates and subsurface temperatures are used to delineate the smoldering front. In addition, downhole temperatures can be used to estimate the rate of movement of elevated temperatures, which is important for isolating and containing the elevated temperature in a timely manner. (C) 2016 Elsevier Ltd. All rights reserved.