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首页> 外文期刊>Renewable energy >Anaerobic co-digestion of swine manure and chicken feathers: Effects of manure maturation and microbial pretreatment of feathers on methane production
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Anaerobic co-digestion of swine manure and chicken feathers: Effects of manure maturation and microbial pretreatment of feathers on methane production

机译：猪粪和鸡羽毛的厌氧消化：粪肥成熟和羽毛的微生物预处理对甲烷产生的影响

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Manures and feathers are abundant wastes from the meat supply chain. Although manures are used in anaerobic digestions to produce methane, feathers recalcitrance might be challenging. Methane production was assessed during mesophilic anaerobic co-digestion (Co-AD) of swine manures with untreated/pretreated feathers. Diluted fresh (DF; 1:2) or matured (DM; 1:1) manures were used both as Co-AD inoculums and main substrates. Co-substrates were feathers (FF) and feather hydrolysates produced through microbial degradation (FH); in Controls, total solids (TS) were adjusted with sterilized manure. In DF experiments, 5.6% TS (27.7% from co-substrate) and 6.8% TS (40.4% from co-substrate) yielded similar methane production [0.48 L CH4/g volatile solids (VSinitial)]. With FF, methane production showed a two-step decomposition pattern. At 6.8% TS, FH reduced yields (43%), possibly through ammonia inhibition. In DM experiments, at 4.60% TS (12.1% from co-substrate) and 5.15% TS (21.3% from co-substrate), methane production was superior with FH (0.16-0.19 L CH4/g VSinitial); FF decreased yields (15-25%), suggesting delayed biodegradation. Modified Gompertz model fitted best to kinetic data. FF and Controls displayed similar methane yields, and FH affected production in a concentration-dependent manner. Microbial pretreatment could increase methane production by improving feathers biodegradability. FH represents a nitrogen-rich substrate for Co-AD with nitrogen-deficient biomasses. (C) 2020 Elsevier Ltd. All rights reserved.
机译：粪便和羽毛是肉类供应链中的大量废物。尽管粪便用于厌氧消化以产生甲烷，但羽毛的顽固性可能具有挑战性。在猪粪与未经处理/经过预处理的羽毛进行中温厌氧共消化（Co-AD）期间评估甲烷的产生。稀释的新鲜（DF; 1：2）或成熟的（DM; 1：1）粪肥均用作Co-AD接种物和主要基质。共底物是羽毛（FF）和通过微生物降解（FH）产生的羽毛水解物。在对照中，总固体（TS）用无菌肥料进行调整。在DF实验中，5.6％的TS（从共底物获得27.7％）和6.8％的TS（从共底物获得40.4％）产生相似的甲烷产量[0.48 L CH4 / g挥发性固体（VSinitial）]。使用FF，甲烷生产显示出两步分解模式。在6.8％的TS下，FH可能通过抑制氨气而降低了收率（43％）。在DM实验中，TS为4.60％（辅助底物为12.1％）和TS为5.15％（辅助底物为21.3％）时，甲烷的生成优于FH（0.16-0.19 L CH4 / g VSinitial）。 FF降低了产量（15-25％），表明生物降解延迟。改进的Gompertz模型最适合动力学数据。 FF和对照显示出相似的甲烷产量，而FH以浓度依赖的方式影响产量。微生物预处理可以通过改善羽毛的生物降解性来增加甲烷的产生。 FH代表具有缺氮生物质的Co-AD的富氮底物。 （C）2020 Elsevier Ltd.保留所有权利。

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