Enhanced Biogas Production and Pathogen Reduction from Pig Manure Through Anaerobic Digestion: A Sustainable Approach for Urban Waste Management in Abidjan, Côte d’Ivoire

Alane Romaric N’guessan, Youan Charles Tra Bi, Edi Guy-Alain Serges Yapo, Akeyt Richmond Hervé Koffi, Franck Orlando Yebouet, Alessio Campitelli (), Boko Aka and N’Dédé Théodore Djeni ()
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Alane Romaric N’guessan: Laboratory of Food Biotechnology and Microbiology, Faculty of Food Sciences and Technology (STA), University Nangui ABROGOUA (UNA), Abidjan 02 BP 801, Côte d’Ivoire
Youan Charles Tra Bi: Laboratory of Biomass-Energy, Institute for Research on New Energies (IREN), University Nangui ABROGOUA (UNA), Abidjan 02 BP 801, Côte d’Ivoire
Edi Guy-Alain Serges Yapo: Laboratory of Food Biotechnology and Microbiology, Faculty of Food Sciences and Technology (STA), University Nangui ABROGOUA (UNA), Abidjan 02 BP 801, Côte d’Ivoire
Akeyt Richmond Hervé Koffi: Laboratory of Food Biotechnology and Microbiology, Faculty of Food Sciences and Technology (STA), University Nangui ABROGOUA (UNA), Abidjan 02 BP 801, Côte d’Ivoire
Franck Orlando Yebouet: Laboratory of Food Biotechnology and Microbiology, Faculty of Food Sciences and Technology (STA), University Nangui ABROGOUA (UNA), Abidjan 02 BP 801, Côte d’Ivoire
Alessio Campitelli: Department of Environmental Analytics and Pollutants, Institute IWAR, Technical University of Darmstadt, Franziska-Braun-Straße 7, 64287 Darmstadt, Germany
Boko Aka: Laboratory of Biomass-Energy, Institute for Research on New Energies (IREN), University Nangui ABROGOUA (UNA), Abidjan 02 BP 801, Côte d’Ivoire
N’Dédé Théodore Djeni: Laboratory of Food Biotechnology and Microbiology, Faculty of Food Sciences and Technology (STA), University Nangui ABROGOUA (UNA), Abidjan 02 BP 801, Côte d’Ivoire

Clean Technol., 2025, vol. 7, issue 4, 1-19

Abstract: In Abidjan, the treatment of pig waste is becoming a priority given the continued growth of pig farms, which readily reuse manure as organic fertilizer. This study evaluated the effectiveness of anaerobic digestion for simultaneous biogas production and pathogen reduction from pig farm residues. Two 1600 L biodigesters were installed at pig farms in Port Bouët (PBk) and Abobo (Ab). They were fed with pig manure and water (1:4 ratio) and monitored over 56 days. The total biogas production was 22.63 m 3 and 16.31 m 3 for the PBk and Ab digesters, respectively, with peak production occurring between days 14 and 28. Following biofilter treatment, the methane content increased to 80–82%, yielding potential energy outputs of 2.32–3.29 kWh/d, with optimal production occurring at a pH of 7.28–7.76. The COD, BOD 5 , organic acid, and total nitrogen levels decreased progressively in the biodigesters, while the mineral element content remained almost unchanged. Complete elimination was achieved for most of the bacteria tested ( E. coli , Enterococcus , Salmonella , etc.). However, Bacillus and Clostridium were able to persist, albeit with significant reductions of between 3.11 and 5.79 log 10 . Anaerobic digestion is an effective method of combining waste treatment and energy recovery. It eliminates major pathogens while producing valuable biogas. This makes it a sustainable waste management solution for urban agricultural systems.

Keywords: anaerobic digestion; pig farm residues; biogas production; pathogen reduction; sustainable waste management (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2025
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