This study presents a techno-economic and environmental analysis of biogas upgrading processes. Biogas upgrading, with the removal of acid gases (CO₂, H₂S) from biogas produced from municipal solid wastes, can reduce air pollutant emission and increase the heat of combustion of the final product, thus promoting biogas use as a transport fuel while mitigating landfill disposal in urban areas. Among technically feasible routes, amine scrubbing results in relatively low methane loss and a renewable methane-enriched product. In this study, diglycolamine and methyldiethanolamine with diethanolamine were considered as solvents. Simulations were carried out using Aspen Plus, in which process variables were evaluated for different process conditions, with the restriction to attend product regulatory specifications. The results indicate that the diglycolamine-based upgrading route can remove up to 99% of the carbon dioxide from the biogas, generating a biomethane product with 91% methane. Net present value (NPV) was calculated for both cases, under economically feasible conditions, considering a biomethane price of 0.38 US$/Nm³. An environmental evaluation based on Life Cycle Assessment (LCA) estimates a reduction of ca. 95% in CO₂ equivalent emissions for the upgraded biomethane.

这项研究提出了沼气升级过程的技术经济和环境分析。沼气升级，除去酸性气体（CO ₂，H ₂S）来自城市固体废物产生的沼气，可以减少空气污染物的排放并增加最终产品的燃烧热，从而促进沼气用作运输燃料，同时减少了城市地区的垃圾填埋处理。在技​​术上可行的路线中，胺洗涤可产生相对较低的甲烷损失和可再生的富含甲烷的产品。在这项研究中，二甘醇胺和甲基二乙醇胺与二乙醇胺被认为是溶剂。使用Aspen Plus进行模拟，其中评估了针对不同过程条件的过程变量，但要遵守产品法规要求。结果表明，基于二甘醇胺的提纯路线可以从沼气中去除多达99％的二氧化碳，从而生成含91％甲烷的生物甲烷产品。³。根据生命周期评估（LCA）进行的环境评估估计减少了约5％。升级后的生物甲烷的CO ₂当量排放量的95％。