Lactobacillus inoculation mediated carboxylates and alcohols production from waste activated sludge fermentation system: Insight into process outcomes and metabolic network.

Autor: Wu L; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia., Ngo HH; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia., Wang C; School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia., Hou Y; School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia., Chen X; College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, China., Guo W; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia., Duan H; School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia., Ni BJ; School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia., Wei W; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia. Electronic address: wei.wei@uts.edu.au.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2024 Oct; Vol. 409, pp. 131191. Date of Electronic Publication: 2024 Jul 31.
DOI: 10.1016/j.biortech.2024.131191
Abstrakt: Producing medium chain fatty acids (MCFAs) from waste activated sludge (WAS) is crucial for sustainable chemical industries. This study addressed the electron donor requirement for MCFAs production by inoculating Lactobacillus at varying concentrations (7.94 × 10 10 , 3.18 × 10 11 , and 6.35 × 10 11  cell/L) to supply lactate internally. Interestingly, the highest MCFAs yield (∼2000 mg COD/L) occurred at the lowest Lactobacillus inoculation. Higher inoculation concentrations redirected more carbon from WAS towards alcohols production rather than MCFAs generation, with up to 2852 mg COD/L alcohols obtained under 6.35 × 10 11  cell/L inoculation. Clostridium dominance and increased genes abundance for substrate hydrolysis, lactate conversion, and MCFAs/alcohol production collectively enhanced WAS-derived MCFAs and alcohols synthesis after Lactobacillus inoculation. Overall, the strategy of Lactobacillus inoculation regulated fermentation outcomes and subsequent carbon recovery in WAS, presenting a sustainable technology to achieve liquid bio-energy production from underutilized wet wastes.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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