Monitoring and Analysis of Gas Emissions from a Closed Landfill Site at Jleeb in Kuwait

摘要

Lack of monitoring for landfill gas (LFG) emissions increases the hazard risk especially when a landfill site is being developed for further uses. This paper discusses the results from a LFG monitoring study carried out at a closed landfill site in Kuwait which lack engineered gas collection and venting system. Jleeb Al Shuyoukh landfill site was active between 1970 and 1993. The composition and seasonal variations in LFG release were monitored at Jleeb landfill site using online sensors for the continuous LFG monitoring at 4 boreholes during the period July 2018 - Feb 2019. The monitored gases included methane (CH_4), carbon dioxide (CO_2), Carbon Monoxide (CO), Volatile Organic Compounds (VOCs), Hydrogen Sulphide (H_2S) and Oxygen (O_2). The concentration of these gases in %v/v was monitored at 1 hour interval for the entire study period along with atmospheric pressure, borehole pressure and ambient temperature. Consistent methane release with a concentration of 40-65 %v/v was observed at 4 boreholes during this study. Among the monitored gases only CO_2 showed a positive correlation with methane. A constant CH_4/CO_2 ratio and lack of correlation with H2S indicated that the landfill is in a stable methane production phase. Lack of correlation between methane release and the borehole pressure as well as ambient temperature indicated high pressure buildup of LFG within the landfill. The study discussed in this paper is a first ever such continuous LFG emission monitoring study being carried out at a landfill site in Kuwait and is expected to be beneficial for the design, implementation and operation of LFG monitoring, collection and utilization facilities at similar sites in the country.