Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 262, Issue -, Pages 348-356Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.08.061
Keywords
Advanced reduction processes; Reducing radicals; Ultraviolet light; Sulfite; Perchlorate
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Funding
- State of Texas as part of the program of the Texas Hazardous Waste Research Center (THWRC)
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Advanced reduction processes (ARPs) are a new class of water treatment processes that combine activation methods and reducing agents to form highly reactive reducing radicals that degrade oxidized contaminants. The combination of sulfite with low-pressure ultraviolet light (UV-L) is the most effective ARP tested to date. In this study, batch kinetic experiments were conducted to characterize the kinetics of perchlorate destruction by the sulfite/UV-L ARP. Experimental variables were pH, sulfite concentration, temperature and UV-L irradiance. The rate of perchlorate degradation by sulfite/UV-L increases with increasing pH and temperature and increases with increasing sulfite concentration to a maximum and then decreases due to lack of mixing within the reactor system used. Efficiency of perchlorate degradation was measured as a quantum yield and was observed to decrease with increasing sulfite concentration. The ultimate product of perchlorate degradation by the sulfite/UV-L ARP is chloride, but chlorate was detected as an intermediate. (C) 2013 Elsevier B.V. All rights reserved.
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