Anaerobic co-digestion of swine manure and chicken feathers: Effects of manure maturation and microbial pretreatment of feathers on methane production

Vera Analise Schommer, Bruno München Wenzel and Daniel Joner Daroit

Renewable Energy, 2020, vol. 152, issue C, 1284-1291

Abstract: 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.

Keywords: Anaerobic digestion; Inoculum; Agro-industrial waste; Microbial pretreatment; Feather hydrolysate; Kinetic modeling (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148120301762
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:152:y:2020:i:c:p:1284-1291

DOI: 10.1016/j.renene.2020.01.154

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().