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Environ Sci Technol

Title:		"Remediation of dichloromethane (CH2Cl2) using non-thermal, atmospheric pressure plasma generated in a packed-bed reactor"
Author(s):		Abd Allah Z; Whitehead JC; Martin P;
Address:		"School of Chemical Engineering and Analytical Science, and section signSchool of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom"
Journal Title:		Environ Sci Technol
Year:		2014
Volume:		20131212
Issue:		1
Page Number:		558 - 565
DOI:		10.1021/es402953z
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"This work describes the application of a non-thermal plasma generated in a dielectric barrier packed-bed plasma reactor for the remediation of dichloromethane (CH2Cl2, DCM). The overall aim of this investigation is to identify the role of key process parameters and chemical mechanisms on the removal efficiency of DCM in plasma. The influence of process parameters, such as oxygen concentration, concentration of initial volatile organic compounds (VOCs), energy density, plasma residence time, and background gas, on the removal efficiency of 500 ppm DCM was investigated. Results showed a maximum removal efficiency with the addition of 2-4% oxygen into a nitrogen plasma. It is thought that oxygen concentrations in excess of 4% decreased the decomposition of chlorinated VOCs as a result of ozone and nitrogen oxide formation. Increasing the residence time and the energy density resulted in increasing the removal efficiency of chlorinated VOCs in plasma. A chemical kinetic model has been developed on the basis of the proposed reaction scheme, and the calculation of end product concentrations are in general good agreement with the observed values. With the understanding of the effect of the key parameters, it has been possible to optimize the remediation process"
Keywords:		"*Environmental Restoration and Remediation/instrumentation/methods Equipment Design Methylene Chloride/*isolation & purification *Models, Chemical Nitric Oxide/chemistry Ozone/chemistry Plasma Gases/*chemistry Spectroscopy, Fourier Transform Infrared Vola;"
Notes:		"MedlineAbd Allah, Zaenab Whitehead, J Christopher Martin, Philip eng Research Support, Non-U.S. Gov't 2013/11/28 Environ Sci Technol. 2014; 48(1):558-65. doi: 10.1021/es402953z. Epub 2013 Dec 12"