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Environ Technol

Title:		Effect of surfactant and oil additions in the biodegradation of hexane and toluene vapours in batch tests
Author(s):		Galindo H; Revah S; Cervantes FJ; Arriaga S;
Address:		"Division de Ciencias Ambientales, Instituto Potosino de Investigacion Cientifica y Tecnologica, San Luis Potosi, Mexico"
Journal Title:		Environ Technol
Year:		2011
Volume:		32
Issue:		1-Feb
Page Number:		167 - 173
DOI:		10.1080/09593330.2010.491132
ISSN/ISBN:		0959-3330 (Print) 0959-3330 (Linking)
Abstract:		"The biological treatment of gaseous emissions of hydrophobic volatile organic compounds (VOCs) results in low rates of elimination partially because of the low solubility of VOCs in water. Recently, the use of two-phase partition bioreactors (TPPBs) was proposed to increase the bioavailability and consequently the elimination capacities of this kind of VOC. In the present study, TPPBs operating in a batch feed mode were tested for biodegradation of hexane and toluene vapours with a microbial consortium. The results obtained were compared with single-phase systems (control experiments). The liquid phase used was silicone oil (organic phase) with the surfactant Pluronic F-68. Experiments were named F1 and F2 for one and two phases, respectively, and F(1S) and F(2S) when the surfactant was included. The maximum specific rates (S(rates)) of hydrocarbon consumption for hexane and toluene were 539 and 773 mg(hydrocarbon)/(g(protein) x h), respectively. For both substrates, the systems that showed the highest S(rates) of hydrocarbon consumption were F2 and F(2S). In experiment F(1S) the surfactant Pluronic F-68 increased the solubility of hydrocarbons in the liquid phase, but did not increase the S(rates). The maximum percentages of mineralization were 51% and 72% for hexane and toluene, respectively. The results showed that simultaneous addition of silicone oil and surfactant favours the mineralization, but not the rate ofbiodegradation, of toluene and hexane vapours"
Keywords:		"Biodegradation, Environmental/*drug effects Bioreactors/*microbiology Hexanes/analysis/*metabolism Poloxamer/pharmacology Silicone Oils/*pharmacology Surface-Active Agents/*pharmacology Toluene/analysis/*metabolism Volatile Organic Compounds/analysis/meta;"
Notes:		"MedlineGalindo, H Revah, S Cervantes, F J Arriaga, S eng England 2011/04/09 Environ Technol. 2011 Jan; 32(1-2):167-73. doi: 10.1080/09593330.2010.491132"