Enhanced waste hot-pot oil (WHPO) anaerobic digestion for biomethane production: Mechanism and dynamics of fatty acids conversion

Shah Faisal; Reham Ebaid; Li Li; Feng Zhao; Qingyuan Wang; Jin Huang; Abdelfatah Abomohra

doi:10.1016/j.chemosphere.2022.135955

Enhanced waste hot-pot oil (WHPO) anaerobic digestion for biomethane production: Mechanism and dynamics of fatty acids conversion

Chemosphere. 2022 Nov;307(Pt 3):135955. doi: 10.1016/j.chemosphere.2022.135955. Epub 2022 Aug 10.

Authors

Shah Faisal¹, Reham Ebaid², Li Li³, Feng Zhao⁴, Qingyuan Wang⁵, Jin Huang³, Abdelfatah Abomohra⁶

Affiliations

¹ Department of Environmental Engineering, School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, China; Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu, 610065, China.
² Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu, 610065, China.
³ Department of Environmental Engineering, School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, China.
⁴ Institute for Advanced Study, Chengdu University, Chengdu, 610106, China.
⁵ Department of Environmental Engineering, School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, China; Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu, 610065, China. Electronic address: wangqy@scu.edu.cn.
⁶ Department of Environmental Engineering, School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, China. Electronic address: abomohra@cdu.edu.cn.

PMID: 35961457
DOI: 10.1016/j.chemosphere.2022.135955

Abstract

Resource depletion and climate changes due to human activities and excessive burning of fossil fuels are the driving forces to explore alternatives clean energy resources. Anaerobic digestion of bio-waste provides a unique opportunity to fulfil this objective through biogas production. The present study aimed to evaluate waste hot-pot oil (WHPO) at different feeding ratios as a novel lipidic waste for anaerobic mono-digestion. The highest recorded maximum biomethane potential (M_max) was 274.1 L kg^-1 VS at 1.2% WHPO, which showed significant differences with those of 0.8% and 1.6% (227.09 and 237.62 L kg^-1 VS, respectively). The changes in volatile fatty acids (VFAs), medium chain fatty acids (MCFAs), and long-chain fatty acids (LCFAs) as intermediates of WHPO decomposition were investigated before and after anaerobic digestion. Results showed efficient production and utilization of VFAs at all studied WHPO ratios, whereas the maximum utilization of VFAs (90-95%) was recorded in the reactors with up to 1.2 %WHPO. Although lipid conversion efficiency decreased by increasing the WHPO ratio, 81.2% lipid conversion efficiency was recorded at the highest applied WHPO treatment, which confirms the potential of WHPO as a promising feedstock for anaerobic digestion. The present results will have major implications towards efficient energy recovery and biochemical management of lipidic-waste through efficient anaerobic digestion.

Keywords: Anaerobic digestion; Biomethane; Fatty acids; Green energy; Waste-to-Energy.

MeSH terms

Anaerobiosis
Biofuels*
Bioreactors*
Fatty Acids
Fatty Acids, Volatile / metabolism
Fossil Fuels
Humans
Methane

Substances

Biofuels
Fatty Acids
Fatty Acids, Volatile
Fossil Fuels
Methane