US Environmental Protection Agency Office of Research & Development, 26 Martin Luther King Dr W, Cincinnati, OH, 45268, USA.
Oak Ridge Associated Universities, USA.
J Environ Manage. 2023 Oct 15;344:118443. doi: 10.1016/j.jenvman.2023.118443. Epub 2023 Jun 22.
Precipitation, evapotranspiration (ET), waste tonnage, landfill gas (LFG), and leachate data were aggregated from public sources to perform a 5-10 year water balance and estimate the contributions of three water sources (precipitation, incoming waste, and leachate recycling) for 36 active municipal solid waste (MSW) landfills in Ohio, USA. Uniquely, the water balance incorporated waste decomposition, using gas collection data to inform mass loss from biodegradation. Moisture contents of 20-30% for incoming waste indicate that entrained water is the largest source of landfill moisture. Infiltration of precipitation into the landfill after ET was the second largest source. Even at facilities where a majority of the leachate generated was recirculated, it did not significantly affect the moisture content in that year. Using the water balance approach, it appears leachate recirculation is unlikely to increase moisture content above 40% by mass, a regulatory threshold in the US, which would impose stricter air pollution control requirements. However, poor stormwater management could easily allow for "bioreactor" conditions to develop. The calculated landfill moisture content was significantly affected by the assumed runoff coefficient (C) parameter. C values below 20% and above 50% produced unrealistically high or low moisture contents, respectively. This approach can assist operators and regulators in understanding the contribution of different sources to a landfill's moisture profile and avoid future operational problems.
沉淀物、蒸发蒸腾作用（ET）、废物量、垃圾填埋场气体（LFG）和渗滤液数据从公共资源中汇总，以进行 5-10 年的水量平衡，并估计三个水源（降水、进入废物和渗滤液回收）对美国俄亥俄州 36 个活跃的城市固体废物（MSW）垃圾填埋场的贡献。独特的是，水量平衡纳入了废物分解，利用气体收集数据来告知生物降解的质量损失。进入废物的水分含量为 20-30%，表明夹带水是垃圾填埋场水分的最大来源。ET 后降水渗透到垃圾填埋场是第二大来源。即使在大多数产生的渗滤液都被再循环的设施中，它也不会显著影响当年的水分含量。使用水量平衡方法，似乎渗滤液再循环不太可能将水分含量提高到 40%以上（质量），这是美国的监管阈值，这将对空气污染控制要求施加更严格的限制。然而，恶劣的雨水管理很容易导致“生物反应器”条件的发展。假设的径流量系数（C）参数显著影响了计算出的垃圾填埋场水分含量。C 值低于 20%和高于 50%分别产生不切实际的高或低水分含量。这种方法可以帮助操作人员和监管机构了解不同来源对垃圾填埋场水分分布的贡献，并避免未来的运营问题。
