This project is engineering oriented and investigates treatment technologies for heavily halogenated organic pollutants. These pollutants have generally proven to be resistant to aerobic biochemical treatment measures. Numerous investigators have recognized the potential advantages of reductive dehalogenation as a mechanism for pretreating such compounds for subsequent aerobic transformations. Staged treatments of this nature would eliminate potential hazards from the release of partially dehalogenated products of reductive processes. Both abiotic and biochemically driven reductive dehalogenation of chlorinated solvents are proposed for study and evaluation in this project. The abiotic and biochemical foci will be studied and developed via three model systems that promote dehalogenation of haloorganic compounds that would be applicable for use under field conditions. Proposed work includes: 1) fundamental and applied investigations into the use of semiconductor-macrocycle hybrid catalysts for the reductive dehalogenation of aqueous-phase halogenated organics; 2) parallel development of in situ groundwater treatment systems based on the use of zero-valence metals (Fe and zn) for the reductive dehalogenation of reductive targets; and 3) isolation and identification of the physiological elements responsible for the reductive dehalogenation of carbon tetrachloride by Shewanella putrefaciens 200.

Project Start
1999-04-01
Project End
2000-03-31
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
10
Fiscal Year
1999
Total Cost
Indirect Cost
Name
University of Arizona
Department
Type
DUNS #
City
Tucson
State
AZ
Country
United States
Zip Code
85721
Valentín-Vargas, Alexis; Neilson, Julia W; Root, Robert A et al. (2018) Treatment impacts on temporal microbial community dynamics during phytostabilization of acid-generating mine tailings in semiarid regions. Sci Total Environ 618:357-368
Brusseau, Mark L (2018) Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface. Sci Total Environ 613-614:176-185
Delikhoon, Mahdieh; Fazlzadeh, Mehdi; Sorooshian, Armin et al. (2018) Characteristics and health effects of formaldehyde and acetaldehyde in an urban area in Iran. Environ Pollut 242:938-951
Hammond, Corin M; Root, Robert A; Maier, Raina M et al. (2018) Mechanisms of Arsenic Sequestration by Prosopis juliflora during the Phytostabilization of Metalliferous Mine Tailings. Environ Sci Technol 52:1156-1164
Yan, Ni; Zhong, Hua; Brusseau, Mark L (2018) The natural activation ability of subsurface media to promote in-situ chemical oxidation of 1,4-dioxane. Water Res 149:386-393
Madeira, Camila L; Field, Jim A; Simonich, Michael T et al. (2018) Ecotoxicity of the insensitive munitions compound 3-nitro-1,2,4-triazol-5-one (NTO) and its reduced metabolite 3-amino-1,2,4-triazol-5-one (ATO). J Hazard Mater 343:340-346
Liu, Pengfei; Rojo de la Vega, Montserrat; Sammani, Saad et al. (2018) RPA1 binding to NRF2 switches ARE-dependent transcriptional activation to ARE-NRE-dependent repression. Proc Natl Acad Sci U S A 115:E10352-E10361
Thomas, Andrew N; Root, Robert A; Lantz, R Clark et al. (2018) Oxidative weathering decreases bioaccessibility of toxic metal(loid)s in PM10 emissions from sulfide mine tailings. Geohealth 2:118-138
Yan, Ni; Liu, Fei; Liu, Boyang et al. (2018) Treatment of 1,4-dioxane and trichloroethene co-contamination by an activated binary persulfate-peroxide oxidation process. Environ Sci Pollut Res Int :
Dehghani, Mansooreh; Sorooshian, Armin; Nazmara, Shahrokh et al. (2018) Concentration and type of bioaerosols before and after conventional disinfection and sterilization procedures inside hospital operating rooms. Ecotoxicol Environ Saf 164:277-282

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