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Membrane bioreactor-assisted volatile fatty acids production and in situ recovery from cow manure

Authors
  • Jomnonkhaow, Umarin
  • Uwineza, Clarisse
  • Mahboubi, Amir
  • Wainaina, Steven
  • Reungsang, Alissara
  • Taherzadeh, Mohammad J
Publication Date
Jan 01, 2021
Identifiers
DOI: 10.1016/j.biortech.2020.124456
OAI: oai:DiVA.org:hb-25818
Source
DiVA - Academic Archive On-line
Keywords
Language
English
License
Green
External links

Abstract

Cow manure (CM) generation in large volumes has for long been considered a waste management challenge. However, the organic content of CM signals opportunities for the production of value-added bioproducts such as volatile fatty acids (VFAs) through anaerobic digestion (AD). However, a robust VFAs fermentation process requires effective methane formation inhibition and enhance VFAs recovery. In this study, thermal pretreatment was applied to inhibit methanogens for enhanced VFAs production and an immersed membrane bioreactor (iMBR) for in situ recovery of VFAs in a semi-continuous AD. Maximal VFAs yield of 0.41 g VFAs/g volatile solids (VS) was obtained from thermally-treated CM without inoculum addition. The CM was further fed to the iMBR operating at organic loading rates of 0.8–4.7 gVS/L.d. The VFAs concentration increased to 6.93 g/L by rising substrate loading to 4.7 g VS/L.d. The applied iMBR set-up was successfully used for stable long-term (114 days) VFAs production and recovery.

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