Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 657, Issue -, Pages 1501-1507Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.12.124
Keywords
Acidic conditions; Alkaline conditions; Anaerobic digestion; Hydrolysis; Methanogenesis
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Funding
- CRHIAM Centre [CONICYT/FONDAP/15130015]
- Spanish Ministry of Economy and Competitiveness [CTM2017-83870-R]
- Ministry of Economy and Competitiveness Ramon y Cajal Programme [RyC 2012-10456]
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This work aims to compare the use of olive mill solid waste as substrate in pH-controlled fermentation at acid (pH - 5), neutral (uncontrolled, pH approximate to 7) and alkaline (pH - 9) operating pH levels. The results obtained in this study indicate that operating pH strongly affected the anaerobic microorganisms and, hence, different target compounds could be obtained by adjusting the operating pH. Fermentation at neutral pH resulted in the conversion of 93.5% of the fed chemical oxygen demand to methane. However, fermentations at pH 5 and 9 resulted in the inhibition of the methanogenic activity. At pH 9, volatile fatty acids reached a maximum concentration of 3.69 g O-2/L, where acetic acid represented up to 79.3% of the total volatile fatty acids. Unlike volatile fatty acid production, an optimal operation of fermentation at pH 5 could allow the recovery of phenols such as vanillin. (C) 2018 Elsevier B.V. All rights reserved.
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