Biomass & Bioenergy ( IF 6 ) Pub Date : 2022-01-04 , DOI: 10.1016/j.biombioe.2021.106331 Priscila Liane Biesdorf Borth 1 , Jessica Klarosk Helenas Perin 1 , Arthur Ribeiro Torrecilhas 1 , Daiane Dias Lopes 2 , Samantha Christine Santos 3 , Emília Kiyomi Kuroda 1 , Fernando Fernandes 1
Among the organic waste sources used for energy recovery through anaerobic digestion, food waste can be emphasized, as they are the result of the growing demand for food in the world. Additionally, lignocellulosic waste is one of the major energy sources available in urban and rural areas. In this context, the objective of this research was to evaluate the effects of food and garden waste co-digestion in the anaerobic process performance and also in the microbial community involved, by comparing two pilot scale reactors (500 L). To enable the comparison between mono-digestion and co-digestion, one reactor was operated only with food waste as a substrate while in the other, 20% of the ORL from the food waste was substituted by garden waste. The results showed a better performance in co-digestion, with a removal of 83% in VS, an average specific methane yield of 0.47 LCH4 gVS−1, a biogas production rate of 86 L d−1, with an average methane content of 67% and a delay in the system acidification when an OLR of 0.24 kgVS m−3d−1 was applied. The SEM images showed that the microorganisms were attached to garden waste particles as support medium for biofilm formation, favoring the development of certain species of microorganisms more resistant to external variations and, consequently, delaying the acidification of the reactor. The analysis of the microbial community in the reactors indicated a higher presence of hydrogenotrophic methanogenic archaea (Methanospirillum, Methanobacterium, Methanobrevibacter and Methanoculleus).
中文翻译:
食物和花园垃圾的中试厌氧共消化:甲烷潜力、性能和微生物分析
在用于通过厌氧消化进行能量回收的有机废物来源中,可以强调食物浪费,因为它们是世界对食物日益增长的需求的结果。此外,木质纤维素废物是城市和农村地区可用的主要能源之一。在这种情况下,本研究的目的是通过比较两个中试规模的反应器(500 升)来评估食物和花园垃圾共同消化对厌氧过程性能以及所涉及的微生物群落的影响。为了能够比较单一消化和共同消化,一个反应器仅以食物垃圾作为底物运行,而在另一个反应器中,来自食物垃圾的 20% 的 ORL 被花园垃圾替代。结果显示共消化性能更好,VS去除率达83%,4 gVS -1,沼气产率为86 L d -1,平均甲烷含量为67%,当应用0.24 kgVS m -3 d -1的OLR时系统酸化延迟。SEM 图像显示,微生物附着在花园垃圾颗粒上,作为生物膜形成的支持介质,有利于某些微生物种类的发展,对外部变化的抵抗力更强,因此,延迟了反应器的酸化。在反应器中的微生物群落的分析表明氢营养产甲烷古细菌的较高存在(Methanospirillum,甲烷,甲烷短和Methanoculleus)。