Life cycle assessment of biogas upgrading technologies

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• 作者：Katherine Starr^a ; ^{Katherine.Starr@uab.es} ; Xavier Gabarrell^a ; ^b ; Gara Villalba^a ; ^b ; Laura Talens^b ; Lidia Lombardi^c
• 关键词：ADP E ; abiotic depletion ; elements ; ADP F ; abiotic depletion ; fossil ; AP ; acidification potential ; AS ; chemical scrubbing with amine solution/amine scrubbing ; AwR ; alkaline with regeneration ; BABIU ; bottom ash for biogas upgrading ; CED ; cumulative energy
• 刊名：Waste Management
• 出版年：2012
• 期刊代码：70_0956053x
• 类别：env
• 出版时间：May, 2012
• 卷：32
• 期：5
• 页码：991-999
• 文件大小：518 K

摘要

This article evaluates the life cycle assessment (LCA) of three biogas upgrading technologies. An in-depth study and evaluation was conducted on high pressure water scrubbing (HPWS), as well as alkaline with regeneration (AwR) and bottom ash upgrading (BABIU), which additionally offer carbon storage. AwR and BABIU are two novel technologies that utilize waste from municipal solid waste incinerators - namely bottom ash (BA) and air pollution control residues (APC) - and are able to store CO₂ from biogas through accelerated carbonation processes. These are compared to high pressure water scrubbing (HPWS) which is a widely used technology in Europe. The AwR uses an alkaline solution to remove the CO₂ and then the solution - rich in carbonate and bicarbonate ions - is regenerated through carbonation of APC. The BABIU process directly exposes the gas to the BA to remove and immediately store the CO₂, again by carbonation. It was determined that the AwR process had an 84%higher impact in all LCA categories largely due to the energy intensive production of the alkaline reactants. The BABIU process had the lowest impact in most categories even when compared to five other CO₂ capture technologies on the market. AwR and BABIU have a particularly low impact in the global warming potential category as a result of the immediate storage of the CO₂. For AwR, it was determined that using NaOH instead of KOH improves its environmental performance by 34%. For the BABIU process the use of renewable energies would improve its impact since accounts for 55%of the impact.