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Title: Anaerobic treatment of olive mill wastewater and piggery effluents fermented with Candida tropicalis
Authors: Gregorio, Martinez-Garcia
Anbu Clemensis, Johnson
Robert T., Bachmann
Ceri J., Williams
Andrea, Burgoyne
Robert G.J., Edyvean
Keywords: Olive mill wastewater;Aerobic fermentation;Anaerobic digestion;Bio-degradation;Candida tropicalis;Phenolic compounds;Sewage -- Purification;Wastewater treatment
Issue Date: May-2009
Publisher: Elsevier B.V.
Citation: Journal of Hazardous Materials, vol.164 (2-3), 2009, pages 1398-1405
Abstract: Olive mill wastewater (OMW) contains high concentrations of phenolic compounds that are inhibitory to many microorganisms making it difficult to treat biologically prior to discharge in waterways. The total mono-cyclic phenol reduction in OMW in this study was carried out by aerobic pre-treatment using the yeast Candida tropicalis in a 18 L batch reactor at 30 °C for 12 days followed by anaerobic co-digestion. A COD removal of 62% and a reduction in the total mono-cyclic phenol content by 51% of the mixture was achieved in the aerobic pre-treatment. Pig slurry was added as co-substrate to supplement the low nitrogen levels in the olive mill wastewater. Subsequent anaerobic treatment was carried out in a 20 L fixed-bed reactor at 37 °C and HRT between 11 and 45 days. After a long start-up period, the OLR was increased from 1.25 to 5 kg COD m-3 day-1 during the last 30 days, resulting in subsequent increase in overall COD removal and biogas production, up to maximum values of 85% and 29 Lbiogas Lreactor- 1 da y- 1, respectively. Methane content of the biogas produced from the anaerobic digestion ranged between 65% and 74%.
Description: Link to publisher's homepage at http://www.elsevier.com/wps/find/homepage.cws_home
URI: http://www.sciencedirect.com/science/journal/03043894
ISSN: 03043-894
Appears in Collections:School of Environmental Engineering (Articles)

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