摘要:
以敦煌市城市生活垃圾处理场为例,分别用Scholl Canyon模型、Mgmemcon模型和IPCC推荐的一阶衰减模型(FOD)估算填埋垃圾在运营期及封场后的产气量,对比分析3种模型估算出填埋气在不同时期的产气规律,并据此进行大气环境影响评价,探讨不同产气模型的估算结果在大气环境评价等级、评价内容、大气环境质量现状监测要求和环境影响的范围及程度等方面的差异。结果表明Mgmemcon模型估算的年最大产气量最小,与其它两种方法差异较大;Scholl Canyon模型和FOD模型预测年最大产气量及相应年份一致。合理选择填埋气预测模型,是客观评价垃圾填埋场建设项目大气环境影响的基础,也是项目建设具备环境可行性的重要依据。
Abstract:
In this paper, a municipal solid waste disposal site of Dunhuang City is taken as an example and Scholl Canyon model, Mgmemcon model and IPCC recommended first order decay model (FOD) are used to estimate gas production in the landfill site during the operation period and after closure. Comparative analysis of the gas generation law at different periods by application of the three models is performed. Then, on the basis of the analysis, atmospheric environmental impact assessment is carried out accordingly. Differences of the estimation results by the different gas generation models are discussed from the aspects of atmospheric environmental assessment ranking, assessment content, monitoring requirements for the current status of atmospheric environmental quality, and scope and extent of environmental impact. The results show that annual maximal gas generation estimated by Mgmemcon model is the minimal, with great difference from the ones by the other two models. The annual maximal gas production estimated by Scholl Canyon model and FOD model and the corresponding year is coincident. Therefore, rational selection of the models for landfill gas estimation is the foundation for objective evaluation of the atmospheric environmental impact of landfill site construction projects as well as the scientific basis for judgement of the environmental feasibility of project construction.
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