Comparative Fuel Yield from Anaerobic Digestion of Emerging Waste in Food and Brewery Systems
Comparative Fuel Yield from Anaerobic Digestion of Emerging Waste in Food and Brewery Systems
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DOI：
10.3390/en15041538
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发表时间：
2022-02-01
期刊：
影响因子：
3.2
通讯作者：
Davis, Sarah C.
中科院分区：
文献类型：
--
作者：
Herman, Tess;Nungesser, Emily;Davis, Sarah C.
食品垃圾（FW）是美国废物流的主要部分，在垃圾填埋场内产生温室气体，但有机会将FW转移到产生沼气和固态肥料的厌氧消化（AD）设施。AD的FW输入的组成决定了这些产品的价值。本研究提供了洞察废物组合物对AD产品的质量的影响，首先表征的沼气和厌氧消化的FW从四种饮食（旧石器时代，生酮，素食，杂食），然后估计从共消化FW和啤酒厂废物（BW）产生的沼气的差异。将废物原料混合物在实验室规模的生物反应器中与活接种物一起孵育21天。在四个试验中，对沼气质量进行了21-30天的监测。使用气相色谱仪分析样品以检测甲烷（CH 4）和二氧化碳（CO2）。废物投入物的组成对沼气的质量有显著影响，但对厌氧消化状态的质量没有影响，这对AD后肥料产品的价值有影响。与富含可溶性碳水化合物的废物不同，蛋白质和脂肪比例较高的废物提高了沼气质量。共消化杂食性食物垃圾与富碳农业废物（AW）提高沼气质量，但从BW产生的沼气并不一定改善随着AW的共消化量的增加。
Food waste (FW), a major part of the US waste stream, causes greenhouse gases within landfills, but there is an opportunity to divert FW to anaerobic digestion (AD) facilities that produce biogas and digestate fertilizer. The composition of FW inputs to AD determines the value of these products. This study provides insight into the effect of waste composition on the quality of AD products by first characterizing the biogas and digestate quality of anaerobically digested FW from four diets (paleolithic, ketogenic, vegetarian, and omnivorous), and then estimating the difference in biogas produced from codigested FW and brewery waste (BW). Waste feedstock mixtures were incubated in lab-scale bioreactors for 21 days with live inoculum. Biogas quality was monitored for 21-30 days in four trials. Samples were analyzed using a gas chromatograph for detection of methane (CH4) and carbon dioxide (CO2). The composition of the waste inputs had a significant impact on the quality of biogas but not on the quality of the digestate, which has implications for the value of post-AD fertilizer products. Wastes with higher proportions of proteins and fats enhanced biogas quality, unlike wastes that were rich in soluble carbohydrates. Codigestion of omnivorous food waste with carbon-rich agricultural wastes (AW) improved biogas quality, but biogas produced from BW does not necessarily improve with increasing amounts of AW in codigestion.