Production of aromatic acids during anaerobic digestion of citrus peel

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Abstract
Commercially prepared citrus oils, distilled citrus oils, limonene and the non‐volatile fraction of lemon oils were all found to be toxic to the anaerobic digestion process for conversion of citrus waste to methane. Toxicity was characterised by appearance of benzoic, phenylacetic and phenylpropionic acids in the digestion liquors, though these acids were not in themselves toxic. The bulk of the phenylpropionic acid was derived from flavonoids.