Document Detail


Removal of trichloromethane and trichloroethylene by suspended zero valent iron and ultraviolet irradiation.
MedLine Citation:
PMID:  12940477     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Effects of stirring action (450 and 660 rpm) and UV irradiation (0, 8, 16 lamps) on TCM and TCE removal were studied in the presence of suspended iron powder (2 g L(-1)). Parameters such as residual fraction of TCM and TCE, ferrous ion buildup, aqueous oxygen remaining, and oxidation and reduction potential were determined as the reactions proceeded. Without TCM and TCE, the accumulation rates of ferrous ions, Fe0 corrosion product, at various UV intensities were in the order of 8 UV lamps > 16 UV lamps > without UV. With UV irradiation, its synergistic effect on TCE removal rate was much more pronounced than TCM. But TCM removal was affected by stirring action more than by UV irradiation. As TCM was present in the Fe0/UV system, its removal rate was in such an order as: 8 UV lamps > 16 UV lamps > without UV. With TCE, its removal rate was in such an order as: 16 UV lamps > 8 UV lamps > without UV. The presence of Fe0 retards the removal rates of both TCM and TCE, possibly due to Fe0 adsorption/desorption dominating Fe0 reduction reaction.
Authors:
Chih-Hsiang Liao; I-Ming Chen; Yih-Feng Chang; Ming-Chun Lu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering     Volume:  38     ISSN:  1093-4529     ISO Abbreviation:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-08-27     Completed Date:  2003-12-10     Revised Date:  2009-08-14    
Medline Journal Info:
Nlm Unique ID:  9812551     Medline TA:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1717-29     Citation Subset:  IM    
Affiliation:
Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science, Tainan, Taiwan. chliao@mail.chna.edu.tw
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Chloroform / chemistry*,  isolation & purification*
Corrosion
Iron / chemistry*
Photochemistry
Solvents / chemistry*,  isolation & purification*
Trichloroethylene / chemistry*,  isolation & purification*
Ultraviolet Rays
Water Purification / methods*
Chemical
Reg. No./Substance:
0/Solvents; 67-66-3/Chloroform; 7439-89-6/Iron; 79-01-6/Trichloroethylene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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