Moutushi Tasnuva, Tupsakhare Swanand S, Castaldi Marco J
Chemical Engineering Department, The City College of New York, CUNY, N.Y, NY 10031, United States of America.
Chemical Engineering Department, The City College of New York, CUNY, N.Y, NY 10031, United States of America.
Sci Total Environ. 2022 Jun 1;823:153685. doi: 10.1016/j.scitotenv.2022.153685. Epub 2022 Feb 5.
Abiotic decomposition of simulated Municipal Solid Waste (MSW) was investigated for thermal reactions that impact landfill gas components such as methane, carbon dioxide, and hydrogen. The gas composition and temperature were monitored as a function of heating rate and time. The tests were conducted at 483 kPa (70 psig), 55 wt% moisture, and 30 to 60 W controlled heat input in the presence of biological inhibitors. The gas composition trends show that for heat inputs higher than 46 W, the CH/CO ratio diverges from the initial value of 1.0 to as low as 0.2, correlated to a decrease in CH concentration. Major findings of the study include that the primary gas composition ratio (CH/CO) starts to reduce from the baseline value of 1.0 as the heating rate is increased from 30 W to 51 W and further declines at significantly higher rates beyond 51 W. The hydrogen evolution was directly proportional to the amount of CH available in the system. Low levels of CH (<25%) correspond to decreased H levels in the system (<5%) whereas injection of CH gas in the system correspond with a renewed H generation The study provides insights into the operational conditions such as available heat and moisture leading to changes in landfill gas ratios.
对模拟城市固体废弃物（MSW）的非生物分解进行了研究，以探究影响填埋气成分（如甲烷、二氧化碳和氢气）的热反应。监测了气体成分和温度随加热速率和时间的变化。试验在483 kPa（70 psig）、55 wt%含水量以及30至60 W的可控热输入条件下进行，且存在生物抑制剂。气体成分趋势表明，对于高于46 W的热输入，CH/CO比值从初始值1.0偏离至低至0.2，这与CH浓度的降低相关。该研究的主要发现包括，随着加热速率从30 W增加到51 W，主要气体成分比（CH/CO）开始从基线值1.0降低，并在超过51 W时以显著更高的速率进一步下降。氢气的释放与系统中可用的CH量成正比。低水平的CH（<25%）对应系统中H水平的降低（<5%），而向系统中注入CH气体会导致H的重新产生。该研究为诸如可用热量和水分等操作条件如何导致填埋气比例变化提供了见解。
