Biomethane production from anaerobic co-digestion at wastewater treatment plants: A critical review on development and innovations in biogas upgrading techniques

Luong N Nguyen; Jeevan Kumar; Minh T Vu; Johir A H Mohammed; Nirenkumar Pathak; Audrey S Commault; Donna Sutherland; Jakub Zdarta; Vinay Kumar Tyagi; Long D Nghiem

doi:10.1016/j.scitotenv.2020.142753

Biomethane production from anaerobic co-digestion at wastewater treatment plants: A critical review on development and innovations in biogas upgrading techniques

Sci Total Environ. 2021 Apr 15:765:142753. doi: 10.1016/j.scitotenv.2020.142753. Epub 2020 Oct 16.

Authors

Affiliations

¹ Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia. Electronic address: luongngoc.nguyen@uts.edu.au.
² Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia.
³ Climate Change Cluster (C3), University of Technology Sydney, NSW 2007, Australia.
⁴ Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland.
⁵ Environmental Biotechnology Group (EBiTG), Department of Civil Engineering, Indian Institute of Technology Roorkee, 247887, India.
⁶ Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia; NTT Institute of Hi-Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Viet Nam.

PMID: 33121765
DOI: 10.1016/j.scitotenv.2020.142753

Abstract

Anaerobic co-digestion (AcoD) can utilise spare digestion capacity at existing wastewater treatment plants (WWTP) to generate surplus biogas beyond the plant's internal energy requirement. Data from industry reports and the peer-reviewed literature show that through AcoD, numerous examples of WWTPs have become net energy producers, necessitating other high-value applications for surplus biogas. A globally emerging trend is to upgrade biogas to biomethane, which can then be used as town gas or transport fuel. Water, organic solvent and chemical scrubbing, pressure swing adsorption, membrane separation, and cryogenic technology are commercially available CO₂ removal technologies for biogas upgrade. Although water scrubbing is currently the most widely applied technology due to low capital and operation cost, significant market growth in membrane separation has been seen over the 2015-2019 period. Further progress in materials engineering and sciences is expected and will further enhance the membrane separation competitiveness for biogas upgrading. Several emerging biotechnologies to i) improve biogas quality from AcoD; ii) accelerate the absorption rate, and iii) captures CO₂ in microalgal culture have also been examined and discussed in this review. Through a combination of AcoD and biogas upgrade, more WWTPs are expected to become net energy producers.

Keywords: Anaerobic co-digestion; Bioenergy; Biogas upgrading; Biogas utilisation; Biomethane.

Publication types

Review

MeSH terms

Anaerobiosis
Biofuels*
Bioreactors
Digestion
Methane
Water Purification*

Substances

Biofuels
Methane