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Appl Microbiol Biotechnol

Title:		"Extraction and biodegradation of a toxic volatile organic compound (1,2-dichloroethane) from waste-water in a membrane bioreactor"
Author(s):		Freitas dos Santos LM; Livingston AG;
Address:		"Department of Chemical Engineering and Chemical Technology, Imperial College, London, UK"
Journal Title:		Appl Microbiol Biotechnol
Year:		1994
Volume:		42
Issue:		2-Mar
Page Number:		421 - 431
DOI:		10.1007/BF00902752
ISSN/ISBN:		0175-7598 (Print) 0175-7598 (Linking)
Abstract:		"An extractive membrane bioreactor has been used to treat a synthetic waste-water containing a toxic volatile organic compound, 1,2-dichloroethane (DCE). Biofilms growing on the surface of the membrane tubes biodegrade DCE while avoiding direct contact between the DCE and the aerating gas. This reduces air stripping by more than an order of magnitude (from 30-35% of the DCE entering the system to less than 1%) relative to conventional aerated bioreactors. Over 99% removal of DCE from a waste-water containing 1600 mg l-1 of DCE was achieved at waste-water residence times of 0.75 h. Biodegradation was verified as the removal mechanism through measurements of CO2 and chloride ion evolution in the bioreactor. No DCE was detected in the biomedium over the operating period. The diffusion-reaction phenomena occurring in the biofilm have been described by a mathematical model, which provides calculated solutions that support the experimental results by predicting that all DCE is biodegraded within the biofilm. Experimentally, however, the rate of DCE degradation in the biofilm was found to be independent of O2 concentration, while the model predictions point to O2 being limiting"
Keywords:		"Biodegradation, Environmental Biofilms Biomass Biotechnology Carbon Dioxide/metabolism Chlorides/metabolism Diffusion Ethylene Dichlorides/*isolation & purification/*metabolism Gram-Negative Bacteria/metabolism Models, Biological Oxygen/metabolism Waste D;"
Notes:		"MedlineFreitas dos Santos, L M Livingston, A G eng Research Support, Non-U.S. Gov't Germany 1994/11/01 Appl Microbiol Biotechnol. 1994 Nov; 42(2-3):421-31. doi: 10.1007/BF00902752"