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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
It is critical to have appropriate treatment options identified for a variety of arsenic in water conditions and appropriate methods developed for assessing the hazard posed by the arsenic-bearing residuals that will inevitably be produced. To the degree that arsenic-bearing residuals are shown to pose an unacceptable risk, 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 two 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.
Contact
Wendell Ela
wela@eng.arizona.edu
(520) 626-9323 |
