Optimized alumina coagulants for water treatment
| DWPI Title: Removing anionic contaminants from contaminated water, comprises adding gallium-polyaluminum coagulant to the contaminated water to form flocs, and removing the flocs from the contaminated water by filtration |
| Abstract: Substitution of a single Ga-atom or single Ge-atom (GaAl12 and GeAl12 respectively) into the center of an aluminum Keggin polycation (Al13) produces an optimal water-treatment product for neutralization and coagulation of anionic contaminants in water. GaAl12 consistently shows ˜1 order of magnitude increase in pathogen reduction, compared to Al13. At a concentration of 2 ppm, GaAl12 performs equivalently to 40 ppm alum, removing ˜90% of the dissolved organic material. The substituted GaAl12 product also offers extended shelf-life and consistent performance. We also synthesized a related polyaluminum chloride compound made of pre-hydrolyzed dissolved alumina clusters of [GaO4Al12(OH)24(H2O)12]7+. |
| Use: The method is useful for removing anionic contaminants from contaminated water. |
| Advantage: The method: eliminates need of addition of lime supplementation; has increased magnitude of pathogen reduction, and contaminant-removal performance; utilizes coagulant product having extended shelf-life and consistent performance; results in minimal residual aluminum; requires less coagulant and coagulant aids; results in improved affordability of the optimized alumina coagulant; is more reliable and economical; has improved efficacy under wider range of naturally occurring conditions including pH, temperature and alkalinity; is more effective in softer water than is alum; utilizes well-defined, monospecific molecular species; and prevents staining of treatment equipment. |
| Novelty: Removing anionic contaminants from contaminated water, comprises either: adding at least 2 ppm of a gallium-polyaluminum (GaAl 12 ) coagulant to the contaminated water to form flocs, and removing the flocs from the contaminated water by filtration, thus producing cleaner water; or adding 2-10 ppm of gallium-polyaluminum coagulant to the contaminated water, forming flocs, and then removing the flocs from the contaminated water by filtration, thus producing cleaner water. |
| Filed: 2/11/2009 |
| Application Number: US2009369042A |
| Tech ID: SD 11164.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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