Oxidative degradation of trichloroethylene adsorbed on active carbons: Use of microwave energy
Chlorinated hydrocarbon compounds (CHCl), such as chlorinated alkanes/alkenes, benzene and biphenyl etc, represent an important fraction of the industrial hazardous wastes produced. Trichloroethylene (TCE) can be removed from waste streams by adsorption on active carbons. The primary objective of the present work was to study the detoxification in air-stream of TCE adsorbed on different types of active carbons using in situ microwave heating. A secondary objective was to examine the regeneration of used carbons from the effects of repeated cyclic operations (adsorption- detoxification). The experimental study has shown that trichloroethylene adsorbed on active carbon can be oxidatively degradated in presence of microwave radiation. Energy can be transferred efficiently to the reaction sites without losing heat to the surrounding vessel. One of the decomposition product of trichloroethylene is free chlorine which is held very strongly on active carbon. Hydrochloric acid on the other hand seems to be less strongly held and appears in large concentration in the exit gas. Production of free chlorine can be avoided by using chlorohydrocarbon mixed with sufficient internal hydrogen. This is also expected to minimize the problem of carbon regeneration encountered in this study. The results obtained from studies on the oxidative degradation of TCE under microwave radiation are promising in a number of respects: (1) the detoxification of TCE adsorbed on active carbon can be conducted at moderate (<400{degree}C) temperatures, and (2) the used carbon bed can be regenerated. A patent on the process has been issued. 9 refs., 2 figs., 2 tabs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5623139
- Report Number(s):
- LA-UR-91-1552; CONF-910430-12; ON: DE91013656
- Resource Relation:
- Conference: 93. annual meeting and exposition of the American Ceramic Society (ACerS), Cincinnati, OH (USA), 28 Apr - 2 May 1991
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ORGANIC HALOGEN COMPOUNDS
DECOMPOSITION
DETOXIFICATION
ACTIVATED CARBON
ADSORPTION
CHLORINE
HIGH TEMPERATURE
HYDROCHLORIC ACID
INDUSTRIAL WASTES
MEETINGS
MICROWAVE RADIATION
REGENERATION
WASTE MANAGEMENT
WASTE PROCESSING
ADSORBENTS
CARBON
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
ELECTROMAGNETIC RADIATION
ELEMENTS
HALOGEN COMPOUNDS
HALOGENS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MANAGEMENT
NONMETALS
ORGANIC COMPOUNDS
PROCESSING
RADIATIONS
SORPTION
WASTES
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400201 - Chemical & Physicochemical Properties