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Appl Biochem Biotechnol

Title:		Biodegradation of dichloromethane along with other VOCs from pharmaceutical wastewater
Author(s):		Priya VS; Philip L;
Address:		"Environmental and Water Resources Engineering Division, Department of Civil Engineering, IIT Madras, Chennai, 600 036, India"
Journal Title:		Appl Biochem Biotechnol
Year:		2013
Volume:		20130110
Issue:		4
Page Number:		1197 - 1218
DOI:		10.1007/s12010-012-0005-1
ISSN/ISBN:		1559-0291 (Electronic) 0273-2289 (Linking)
Abstract:		"The present study dealt with the interaction of dichloromethane (DCM) with other non-chlorinated organic solvents such as methanol, acetone, toluene, and benzene, which are commonly present in the pharmaceutical wastewater, during biodegradation by mixed bacterial consortium. Non-chlorinated solvents were easily degradable even at an initial concentration of 1,000 mg/L, whereas only 20 mg/L of DCM was degraded when used as sole carbon source. The Monod Inhibition model appears to simulate the single pollutant biodegradation kinetics satisfactorily. In dual substrate systems, low concentrations (100 mg/L) of non-chlorinated solvents did not interfere with the DCM degradation. Non-interaction sum kinetics model was able to simulate the experimental results well in this case. However, high concentrations of non-chlorinated solvents (1,000 mg/L) affected the DCM degradation significantly. There was severe competition between the chlorinated and the non-chlorinated solvents. In this case, competitive inhibition model predicted the experimental results better compared to co-metabolism model. In multiple substrate system also, presence of DCM prolonged the degradation of the other non-chlorinated solvents. However, the presence of non-chlorinated compounds accelerated the degradation of DCM. The results of the present study may be helpful in optimal design of biological systems treating mixed pollutants"
Keywords:		"*Biodegradation, Environmental Methylene Chloride/*metabolism Volatile Organic Compounds/*metabolism Water Pollutants, Chemical/*metabolism;"
Notes:		"MedlinePriya, V S Philip, Ligy eng 2013/01/12 Appl Biochem Biotechnol. 2013 Feb; 169(4):1197-218. doi: 10.1007/s12010-012-0005-1. Epub 2013 Jan 10"