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Figures show structure and resulting Mulliken charge distribution for adsorption of As(III) to the iron oxide cluster: Fe 2(OH) 2(H 2O) 6 3+. The structure corresponds to a bidentate corner sharing between As(III) and two iron octahedra. The structure and binding energy were calculated with the BLYP (76,77) gradient corrected functional using double zeta numeric basis sets with polarization functions. Structure color code: As (purple), Fe (blue), O (red) and H (white). |
Background
Not only is it critical to have appropriate arsenic treatment options identified for a variety of water conditions, it is equally important to ensure the arsenic-bearing residuals from these treatment processes do not present an unacceptable risk to humans or the environment after disposal. The residuals of many current treatment technologies are not stable after their disposal. Thus, the mechanisms of arsenic release must be understood and technologies must be developed to stabilize these residuals and mitigate the risk to an acceptable level.
Goal
To address shortcomings and provide advances in three critical areas: arsenic treatment technologies, arsenic residuals assessment and arsenic residuals stabilization.
Objectives
1. Development and testing of innovative approaches for removing arsenic from water.
2. Development, mechanistic interpretation and validation of a testing protocol to assess arsenic and other hazardous oxyanion leaching from solids under landfill conditions.
3. Development, mechanistic interpretation and testing of two technologies (encapsulation and crystallization) to produce environmentally benign arsenic treatment residuals.
Project 8 publications resulting
from research conducted under the Superfund Research Program
during the grant funding period of 2005 to present.
Contact
Wendell Ela
wela@eng.arizona.edu
(520) 626-9323 |
