Characterisation and variability of greenhouse gas emissions from biomethane production via anaerobic digestion of maize
Characterisation and variability of greenhouse gas emissions from biomethane production via anaerobic digestion of maize
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DOI：
10.1016/j.jclepro.2018.12.232
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发表时间：
2019-05-01
影响因子：
11.1
通讯作者：
McManus, Marcelle C.
中科院分区：
文献类型：
--
作者：
Adams, Paul W. R.;McManus, Marcelle C.
生物甲烷是一种可再生气体，可用于现有基础设施，以减少对天然气的依赖并降低温室气体（GHG）排放。政策激励措施促进了利用厌氧消化（AD）的生物甲烷生产设施的快速实施。反倾销中使用了一系列原料，包括温室气体负担高于大多数废物和残留物的作物。本研究的目的是验证和评估典型的生物甲烷设施的温室气体排放。减少温室气体排放势在必行，因此使用可靠的方法量化排放至关重要。本研究使用玉米作为案例研究，利用来自几个农场和AD设施的数据。结果表明，使用可再生能源指令（RED）方法计算的玉米生物甲烷生产的排放量为33.8 gCO（2）e/MJ生物甲烷。主要排放源包括氮肥生产、土壤N2 O排放、进口电力使用和逃逸性甲烷。进行的敏感性分析评估了关键数据输入，并表明输入清单参数如何影响温室气体平衡，并突出了结果的可变性。为了实现预期的温室气体减排，运营商必须尽量减少化肥的使用，使用氮抑制剂，尽量减少进口电力，并对甲烷损失进行密切管理。本文表明，虽然生物甲烷被认为是一种可再生的低碳燃料，但为了实现这一目标，需要仔细管理投入。(C)2018爱思唯尔有限公司版权所有。
Biomethane is a renewable gas that can be used in existing infrastructure to reduce dependency on natural gas and lower greenhouse gas (GHG) emissions. Policy incentives have promoted a rapid implementation of biomethane production facilities using anaerobic digestion (AD). A range of feedstocks are used in AD including crops which have a higher GHG burden than most wastes and residues. The purpose of this research is to characterise and assess GHG emissions from typical operational biomethane facilities. It is imperative that GHG savings are obtained therefore quantifying emissions using a robust methodology is paramount. This study uses maize as a case study utilising data from several farms and AD facilities. Results show that calculated emissions for biomethane production from maize are 33.8 gCO(2)e/MJ of biomethane using the Renewable Energy Directive (RED) methodology. Key emission sources include N-fertiliser production, soil N2O emissions, imported electricity use, and fugitive methane. Sensitivity analysis performed assessed key data inputs and demonstrates how input inventory parameters affect the GHG balance and highlights variability in results. For the desired GHG savings to be achieved it is important that operators minimise fertiliser use, use nitrogen inhibitors, minimise imported electricity, and undertake close management of methane loss. This paper shows that although biomethane is considered a renewable, low carbon fuel, the inputs need to be carefully managed in order to achieve this. (C) 2018 Elsevier Ltd. All rights reserved.