Work

Unlocking Synergistic Biogas Potential: Pig Manure and Khat Waste Cosubstrates

Year: 2026

Type: article

Abstract: Energy scarcity is now a global issue that motivates researchers to explore other energy sources. The purpose of this study was to investigate the possible uses of pig manure (PM) and khat waste (KW) substrate blends for biogas production. The two substrates, namely, PM and KW, initially were treated separately, followed by mixing for anaerobic digestion. In this process, the contribution of mixing ratio (75:25, 50:50, 25:75), temperature (25-45 °C), and hydraulic retention times (30-50 days) on the yield of biogas volume and methane percentage was studied through a central composite design (CCD) experimental design methodology. Consequently, the highest biogas volume of 1831.2 mL and methane percentage of 61.4 wt % were observed at a mixing ratio of 50:50 (PM/KW, %), 45 °C temperature, and hydraulic retention time of 40 days. In summary, the research indicates that utilizing pig manure in combination with khat waste for the production of biogas may be a possible alternative energy source that can address existing global energy challenges.

Source: ACS Omega

DOI: 10.1021/acsomega.5c08963

Authors: Sewagegn Menberu Tegegne, Anand Babu Desamala, Talbachew Tadesse Nadew, Kedir Derbie Mekonnen, Firomsa Teshale Tolera

Institutions: Wollo University, Kombolcha Institute of Technology, King Fahd University of Petroleum and Minerals, Ethiopian Policy Studies Institute

Language: English

Topic: Anaerobic Digestion and Biogas Production

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Affordable and clean energy, Climate action

Open Access status: gold

Estimated APC paid: $1,935