Research Article | OPEN ACCESS
Enhancement of Biogas Potential for Slaughterhouse Waste by Co-digestion with Animal Wastes
1Elijah Chebett, 2, 3Ambrose Kiprop, 1Saul Namango, 1, 2Milton Arimi, 1Kirimi Kiriamiti and 4Y.A.C. Jande
1Department of Chemical and Process Engineering, Moi University,
2Africa Center of Excellence in Phytochemicals, Textile and Renewable Energy (ACEII-PTRE), Moi University,
3Department of Chemistry and Biochemistry, Moi University,
4Africa Center of Excellence in Water Infrastructure and Sustainable Energy Futures (WISE-Futures), Nelson Mandela African Institution of Science and Technology (NM-AIST), Arusha, Tanzania
Research Journal of Applied Sciences, Engineering and Technology 2021 2:70-78
Received: April 16, 2020 | Accepted: May 8, 2020 | Published: May 25, 2021
Abstract
The aim of the current study was to investigate biogas production from the slaughterhouse waste codigested with animal wastes. Slaughterhouses generate organic wastes that are environmentally hazardous due to high contents of biological contaminants. The use of anaerobic digestion of the slaughterhouse waste can achieve twin objectives of waste treatment and energy production as biogas. The process is however, limited by low biogas potential of slaughterhouse waste. The study evaluated the effect of co-digesting the slaughterhouse, chicken and pig wastes on biogas potential. The co-digestion test with combination ratio of 1:1, slaughterhouse waste and chicken waste produced the highest value of biogas potential of 636 L/kg-VS, which was almost double that from pure slaughterhouse waste. In addition, the substrate biodegradability, the biogas productivity and the yield were most improved at 1:1 co-digestion. The digestate from the process had high nutrient contents and a maximum of; 0.8, 2.6 and 2.7% of dry matter for total nitrogen, phosphate and Potassium respectively. The kinetic analysis of the co-digestion process using modified Gompertz equation indicated a correlation between the waste biodegradability and biogas yield. The enhancement of the C/N ratio in the slaughterhouse waste by co-digestion with these wastes could be responsible for the improvement of the biogas production and yield. Future studies should focus on how the nutrient rich digestate can be appropriately applied as bio-fertilizer and on how co-digestion affects the pathogens in slaughterhouse wastes.
Keywords:
Anaerobic digestion, biodegradability, biogas yield, biomethane, Gompertz equation, slaughterhouse waste,
Competing interests
The authors have no competing interests.
Open Access Policy
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Copyright
The authors have no competing interests.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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