Program One
Tuesday, May 20, 1997

Metals Kansa A



M.D. Johnson and R.M. Wingo, Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 Heavy metal contamination of wastewater streams remains a concern in the overall field of environmental remediation. These metals enter the environment through a variety of avenues that include: mining, nuclear power plants, industrial processing plants, and photographic development. Even some natural waters contain high levels of metals.

Current remediation generally revolves around precipitation techniques, generally using amorphous iron(III) oxyhydroxides. Our recent work has focused on the incorporation of heavy metals into a magnetite (Fe304)matrix. Removal by this technique not only provides the cost effectiveness of using iron compounds for precipitation, but it also avails itself to magnetic separation techniques for waste removal.

Specifically, our work has entailed the removal of actinides and transition metals from water in the presence of potential organic chelators. The metals studied include silver, lead, mercury, cadmium, chromium as well as uranium and thorium. Excellent removal was found for each of these metals in the absence of organics.

The chelating agents selected for study are those commonly found in industrial cleansers. These include EDTA, NTA, ethanolamine, and as well as common long chain oxysurfactants. As would be expected, certain organics do supress metal ion removal from aqueous media. It is assumed that the metal-ligand complexes formed prevent incorporation of the metal ion into the magnetite matrix. Surprisingly however, the presence of certain organics actually enhanced the removal efficiencies. The results of these studies will be discussed in this presentation.

Key words: heavy metals, precipitation techniques, chelating agents, metal ion removal, aqueous media

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Tuesday, May 20, 1997

Metals Kansa A

Remediation of Munitions Compounds Kansa B

Analytical Methods Kansa C/D

General Topics Kansa B

Wednesday, May 21, 1997

Metals Kansa A

Zero-Valent Metals Kansa A

Remediation Kansa A

Vegetation-based Remediation Kansa B

Partnerships & Innovative Technologies Kansa C/D

Nonaqueous Phase Liquids Kansa C/D

Thursday, May 22, 1997

Biofilms & Barriers Kansa A

Bioremediation Kansa B

Partnerships & Technology Innovations Kansa C/D

Remediation Kansa C/D


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