Synthesis evaluation on thermophilic anaerobic co-digestion of tomato plant residue with cattle manure and food waste

IF 12.4 Q1 ENVIRONMENTAL SCIENCES Resources Environment and Sustainability Pub Date : 2023-09-01 DOI:10.1016/j.resenv.2023.100119
Xiaorui Xue , Xiaojue Li , Naoto Shimizu
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Abstract

Anaerobic digestion (AD) is an effective method for treating organic waste. However, the performance of anaerobic reactors needs to be improved and comprehensively analyzed. This study proposed a ternary co-feedstock strategy for thermophilic anaerobic co-digestion of tomato plant residue, cattle manure, and food waste. The effects of changing the feedstock composition, feedstock-to-inoculum ratio, and total solids (TS) content were investigated. Among the tested mixtures, a ternary mixture of 60% tomato plant residue, 20% cattle manure, and 20% food waste with a feedstock-to-inoculum ratio of 0.7 gave the highest cumulative biogas (3.230 L), methane yield (2.575 L), methane content (79.71%), co-digestion performance index (1.65) and volatile solids (VS) removal rate (60.59%). Changing the feedstocks compositions caused changes in the specific biogas yield and specific methane yield. In tests with TS contents of 5%, 10%, 15%, and 20%, a higher TS content increased biogas and methane production because of increases in the amount of the biodegradable fraction in the reactor. However, there was a risk of volatile fatty acid overloading and a decrease in the VS removal rate because of inefficient decomposition of the high total solids content by microbes in the inoculum.

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番茄植物残渣与牛粪及食物垃圾厌氧共消化的合成评价
厌氧消化是处理有机废物的一种有效方法。然而,厌氧反应器的性能还有待提高和综合分析。本研究提出了番茄植物残渣、牛粪和食物垃圾厌氧共消化的三元共原料策略。考察了不同原料组成、料接种比和总固形物(TS)含量的影响。其中,以60%番茄残渣、20%牛粪、20%餐厨垃圾为混合料,料接种比为0.7时,累积沼气(3.230 L)、甲烷产量(2.575 L)、甲烷含量(79.71%)、共消化性能指数(1.65)和挥发性固体(VS)去除率(60.59%)最高。改变原料组成引起比沼气产率和比甲烷产率的变化。在TS含量为5%、10%、15%和20%的试验中,较高的TS含量增加了沼气和甲烷的产量,因为反应器中可生物降解部分的数量增加了。然而,由于接种物中微生物对高总固体含量的分解效率低下,存在挥发性脂肪酸超载和VS去除率降低的风险。
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来源期刊
Resources Environment and Sustainability
Resources Environment and Sustainability Environmental Science-Environmental Science (miscellaneous)
CiteScore
15.10
自引率
0.00%
发文量
41
审稿时长
33 days
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