Periodic Table [reference]

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Cus-indica is a better flocculant than aluminum sulfate in all three of its extracted forms (GE, NE, and CE) and could be used by low-income Latin American communities for settling suspended solids in turbid drinking water–storage containers. The use of mucilage is also appropriate for removal of total arsenic in contaminated drinking water and owes its flocculation abilities to its chemical structure, consisting of C–O functionality. Further investigation is required to review the mucilage-selective removal of arsenic based on speciation as well as the feasibility of implementing this technology in a distributable or easy-to-assemble filter form for small-scale household removal.

Three innovative adsorptive media that have the potential to reduce the costs of arsenic removal from drinking water were selected. The arsenic removal performance of these different adsorptive media under constant ambient flow conditions was compared using a combination of static (batch) and dynamic flow tests. These included batch sorption isotherm and kinetic sorption studies, rapid small-scale column tests (RSSCTs), and a pilot test at a domestic water supply well. The media studied included a granular ferric oxyhyroxide (E33), a granular titanium oxyhydroxide (MetSorb), and an ion-exchange resin impregnated with iron oxide nanoparticles (ArsenX).

8. S. H. Frisbie. et al. Environ. , 2002, 110:1147. 9. BGS/DPHE (British geological survey/Department of Public Health Engineering, Bangladesh). Arsenic Contamination of Groundwater in Bangladesh, vol. 1, Summary. D. G. Kinniburgh and P. L. Smedley, Eds. British Geological Survey Report WC/00/19. pdf. 10. M. Bissen and F. Frimmel. Arsenic—a review: I. Occurrence, toxicity, speciation, mobility. Acta Hydrochim. , 2003, 31:9–18. REFERENCES 21 11. M. Bissen and F. Frimmel. Arsenic—a review. II. Oxidation of arsenic and its removal in water treatment.

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