Journal
BIORESOURCE TECHNOLOGY
Volume 342, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125926
Keywords
Anaerobic Digestion; Biorefining; VFAs; Electrodialysis; Platform Chemicals
Funding
- EU Horizon 2020 [730349, 80835]
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A novel combination of technologies was used to recover VFAs from a bioreactor, significantly increasing VFA yields and addressing end-product inhibition. These achievements represent important breakthroughs in adding value to waste and increasing substrate utilization rates.
A novel combination of solids screening, centrifugation, microfiltration, pervaporation, and electrodialysis were used for the targeted and exclusive recovery of volatile fatty acids (VFAs) from an 80 L bioreactor. The bioreactor was continually-fed with grass waste, containing 40 g L-1 total solids, over three, seven-day, hydraulic retention times. A VFA solution with a concentration up to 4,500 mg L-1 was recovered. VFA yields were also increased from 707 to 875 mg of VFA per gram of volatile solids by alleviating end-product inhibition. Both these accomplishments are significant step-changes in adding value to waste, and increased substrate utilisation rates will be attractive from a waste remediation perspective.
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