Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 10, Pages 6348-6351Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.02.106
Keywords
Biodiesel manufacturing; Oily wastewater; Coagulation-flocculation; Electrocoagulation; Mesophilic anaerobic digestion
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The mesophilic anaerobic digestion of wastewater derived from biodiesel manufacturing, in which total chemical oxygen demand (COD total) was found to be 428 g/L, was studied at laboratory scale. Firstly, wastewater was acidified to recover its free fatty acid content. The resulting aqueous phase was then neutralized and subjected to coagulation-flocculation and electrocoagulation to demulsify the remnant organic matter. A 45% and 63% reduction in overall COD total was observed with the acidification-electrocoagulation and acidification-coagulation-flocculation pre-treatments, respectively. However, the anaerobic biodegradability of acidified-electrocoagulated wastewater was found to be the highest (98% COD), while the methane yield coefficient reached a mean value of 297 mL CH4/g COD removed (1 atm, 0 degrees C). Moreover, the allowed organic loading rate and the mean methane production rate were considerably higher for acidified-electrocoagulated wastewater. Consequently, the combination of acidification-electrocoagulation with anaerobic digestion might be a good alternative to efficiently purify wastewater derived from biodiesel manufacturing. (C) 2011 Elsevier Ltd. All rights reserved.
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