Journal
WATER RESEARCH
Volume 100, Issue -, Pages 316-325Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.05.008
Keywords
Bioelectrochemical systems; Table olive processing wastewater; Methane production; Phenolic compounds; Electroactive biofilm
Funding
- Waste2bioHy project [FP7-MC-IEF - GA-326974]
- Marie Curie Intra European Fellowship within the 7th European Community Framework Program
- French National Research Agency [ANR-10-BTBR-02]
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Industry of table olives is widely distributed over the Mediterranean countries and generates large volumes of processing wastewaters (TOPWs). TOPWs contain high levels of organic matter, salt, and phenolic compounds that are recalcitrant to microbial degradation. This work aims to evaluate the potential of bioelectrochemical systems to simultaneously treat real TOPWs and recover energy. The experiments were performed in potentiostatically-controlled single-chamber systems fed with real TOPW and using a moderate halophilic consortium as biocatalyst. In conventional anaerobic digestion (AD) treatment, ie. where no potential was applied, no CH4 was produced. In comparison, Bio-Electrochemical Systems (BES) showed a maximum CH4 yield of 701 +/- 13 NmL CH4.L-TOPW(-1) under a current density of 7.1 +/- 0.4 A m(-2) and With a coulombic efficiency of 30%. Interestingly, up to 80% of the phenolic compounds found in the raw TOPW (i.e. hydroxytyrosol and tyrosol) were removed. A new theoretical degradation pathway was proposed after identification of the metabolic by-products. Consistently, microbial community analysis at the anode revealed a clear and specific enrichment in anode-respiring bacteria (ARB) from the genera Desulfuromonas and Geoalkalibacter, supporting the key role of these electroactive microorganisms. As a conclusion, bioelectrochemical systems represent a promising bioprocess alternative for the treatment and energy recovery of recalcitrant TOPWs. (c) 2016 Elsevier Ltd.
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