February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 5, NUMBER 5, MAY 1992
"Biological Degradation of Chlorofluorocarbons in Anaerobic
Environments," B.A. Denovan, S.E. Strand (Forest Resour., Univ. Washington,
Seattle WA 98195), Chemosphere, 24(7), 935-940, Apr. 1992.
In laboratory studies, F-11, F-12 and F-113 were degraded by microbial
activity in anaerobic sludges, and F-11 and F-113 were degraded in sediments. Up
to 9% of all CFCs may be susceptible to biological degradation before release to
"Investigation of the Thermal Destruction of Chlorofluoromethanes in
a Turbulent Flame," J.R. Pedersen (Studsvik Energy, S-611 82 Nyköping,
Swed.), B. Källman, ibid., 24(2), 117-126, Jan. 1992.
Destruction of CFCs of 99.995% or better was achieved in a turbulent
jet-stirred burner using either propane or methane as fuel. Under proper
conditions, emissions of chlorobenzenes in the flue gases are in the ppb range.
Fire extinguisher bromotrifluoromethane can be similarly destroyed; the
formation of free bromine can be inhibited by injection of steam into the flame,
which also reduces the amount of chlorinated hydrocarbons emitted.
"Dehalogenation of Trichlorofluoromethane (CFC-11) by Methanoscarcina
barkeri," U.E. Krone (Mikrobiol. Lab., Univ. Marburg, K. von Frisch
Str., W-3550 Marburg, Ger.), R.K. Thauer, FEMS Microbiol. Lett., 90(2),
201-204, Jan. 1, 1992. Products observed from the reductive dehalogenation were
CHFCl2, CH1FCl, CO and fluoride.
"Direct Catalytic Oxidation of Halogenated Hydrocarbons," J.R.
Kittrell (KSE Inc., POB 368, Amherst MA 01004), C.W. Quinlan, J.W. Eldridge,
J. Air Waste Mgmt. Assoc., 41(8), 1129-1133, Aug. 1991.
Describes a new process which can selectively oxidize halogenated
hydrocarbons to hydrochloric acid and CO2. This low temperature catalytic
combustion is shown to have advantages over thermal incinerators, the principal
destruction alternative, and is effective for small-scale installations.
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