Trace Element Supplementation and Enzyme Addition to Enhance Biogas Production by Anaerobic Digestion of Chicken Litter

Navodita Bhatnagar, David Ryan, Richard Murphy and Anne-Marie Enright
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Navodita Bhatnagar: EnviroCORE, Department of Science and Health, Institute of Technology Carlow, R93 V960 Carlow, Ireland
David Ryan: EnviroCORE, Department of Science and Health, Institute of Technology Carlow, R93 V960 Carlow, Ireland
Richard Murphy: Alltech Biotechnology Centre, Sarney, A86 X006 Dunboyne, Ireland
Anne-Marie Enright: EnviroCORE, Department of Science and Health, Institute of Technology Carlow, R93 V960 Carlow, Ireland

Energies, 2020, vol. 13, issue 13, 1-14

Abstract: Anaerobic digestion (AD) of chicken litter (CL) is a viable alternative to disposal. However, methane yields from this primarily organic waste are quite low when mono-digested. This paper discusses the effect of an enzyme cocktail, trace element (TE) supplementation and selenium (Se) addition in small-scale batch biomethane potential (BMP) assays to enhance the AD of CL. Eleven different assays were set up in triplicate including assays containing only inoculum (blank), only CL (negative control) and cellulose and inoculum (positive control). The results indicate that both enzyme treatment and trace element supplementation enhanced the biogas and methane yield. The highest specific biogas and methane yields were noted for 1% enzyme-treated CL of 835.2 L/kg volatile solids (VS) and 460.8 L/kg VS, respectively. Usually, mono-digestion of CL is low due to high nitrogen content and the presence of recalcitrant lignocellulosic material from the bedding material. Enzyme treatment performed better than the addition of the TE mix and Se.

Keywords: anaerobic digestion; trace elements; enzyme cocktail; chicken litter; specific methane yield; biodegradability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (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)

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