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IMPACTS OF IRON, NUTRIENTS, AND MINERAL FINES ON ANAEROBIC BIODEGRADATION OF CANOLA OIL IN FRESHWATER SEDIMENTS
Citation:
Li, Z., B. A. Wrenn, B. Mukherjee, K. Lee, AND A. D. VENOSA. IMPACTS OF IRON, NUTRIENTS, AND MINERAL FINES ON ANAEROBIC BIODEGRADATION OF CANOLA OIL IN FRESHWATER SEDIMENTS. J.Dragun, P. Kostecki (ed.), SOIL AND SEDIMENT CONTAMINATION: AN INTERNATIONAL JOURNAL. CRC Press - Taylor & Francis Group, LLC, Boca Raton, FL, 19(2):244-259, (2010).
Impact/Purpose:
The specific objectives of this work were: (1) to study the effect of various doses of ferric iron on biodegradation of canola oil in freshwater sediments; (2) to investigate the effect of nutrient supply on biodegradation of vegetable oil in freshwater sediments; (3) to test the effect of mixing energy during formation of vegetable-oil-mineral-aggregates on the biodegradation rate of vegetable oil in sediments. Laboratory microcosm studies were conducted to achieve these goals.
Description:
Factors affecting anaerobic biodegradation kinetics of canola oil in freshwater sediments were investigated. An optimum dose of ferric hydroxide (10.5 g Fe(III)·kg-1 sediment) was found to stimulate anaerobic biodegradation of canola oil (18.6 g oil kg-1). The effect of iron was shown to maximize methane yield and to minimize the lag time for initiation of active oil degradation. Supply of nutrients (nitrogen and phosphorus) to the sediments changed iron reduction rate but did not affect methanogenesis from oil biodegradation in microcosms. An integrated sedimentation and biodegradation study demonstrates that the canola oil entrained in sediments as oil-mineral aggregates was biodegradable under anaerobic conditions. Although high initial mixing energy (200 rpm) removed less oil from the surface and water column to the sediment phase than low mixing energy (20 and 40 rpm), this factor did not change the methane production rate. This laboratory results provide useful data for planning field development and evaluation of anaerobic bioremediation of vegetable oil spills in aquatic environments.
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IMPACTS OF IRON, NUTRIENTS, AND MINERAL FINES ON ANAEROBIC BIODEGRADATION OF CANOLA OIL IN FRESHWATER SEDIMENTS