Modeling of photolysis and hydroxyl radical reactions of 1,1,1-trichloroethane using multi-wavelength UV sources

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:214669

Loraine, G A; Glaze, W H ^[1]

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1. Univ. of North Carolina, Chapel Hill, NC (United States)

A process for the photolysis of hydrogen peroxide (UV/H{sub 2}O{sub 2}) is being used for the oxidation of organic chemicals in contaminated groundwater, surface water, and wastewaters. Models of the UV/H{sub 2}O{sub 2} process are available, although restricted to a single wavelength (usually 254 nm) UV source. In practice, lamps used in many environmental applications are high output multi-wavelength lamps, often medium pressure mercury vapor lamps. In this work, a model was developed for solving simultaneous multi-wavelength photolysis and radical reactions of the UV/H{sub 2}O{sub 2} system with a single substrate (1,1,1-trichloroethane) and its by-products. Micromath Scientist, a data handling software package, was used as a platform to build the computer model. The program integrates changing photolysis rates of the major light absorbing species as their relative concentrations change into a system for solving simultaneous ordinary differential equations (ODEs). Thus, the photolysis rates were dynamically linked to the mechanism solver. Experimental data are compared to model simulations, and cost comparisons for single and multi-wavelength treatments are computed.

• OSTI ID: 214669
• Report Number(s): CONF-950801--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
40 CHEMISTRY
CHLORINATED ALIPHATIC HYDROCARBONS
DIFFERENTIAL EQUATIONS
ENVIRONMENTAL MATERIALS
HYDROGEN PEROXIDE
OXIDATION
PHOTOLYSIS
REMEDIAL ACTION
WASTE PROCESSING
WASTE WATER