Removal of Arsenic Compounds From Waste Water L

Removal of Arsenic Compounds From Waste Water

Land disposal of arsenic containing waste, use of arsenic containing pesticides and ore smelting have resulted in increased environmental levels of arsenic containing compounds. (15, 13) A significant amount of these arsenic containing compounds contaminates waste water. An examination of any process for reducing increased levels of arsenic containing compounds in waste water involves an understanding of the chemistry of dissolved arsenic containing compounds, an effective method for measuring dissolved arsenic compounds, and an efficient system for removal of arsenic containing compounds from waste water. Removal of arsenic containing compounds should be addressed in the context of an integrated waste water management program.

Anderson and Bruland (1) examined the forms that arsenic containing compounds take in aqueous solution. Inorganic arsenic

may be found as arsenate (H2ASO4-), arsenite (AS(OH)3), arsine

(AsH3), monomethylarsenate (CH3AsO2OH-) , dimethylarsenate

((CH3)2AsO2OH-), dimethylarsine ((CH3)2AsH3) trimethylarsine

((CH3)2AsH3), and triethylarsine ((CH3-CH3)2AsH3). In a survey of

California lakes and rivers, total arsenic levels ranged from a low of 6.9 nM in Lake Ontario to a high of 230000 nM in Mono lake. The relatively high values in Mono Lake and Pyramid Lake (1300 nM) were two to six orders of magnitude higher than the values found in the other sites tested. (1) In this study, Mono Lake had the hig

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ic concentration of the test sample when the initial concentration of arsenic was 6.65 X 10-2 mol dm-3. The process used in this system is based on the combination of a multistage ion exchange, absorption and chemical reaction systems in the filter system. Jubinka et al. found that of the column material tested in the process, activated carbon plus Cu2+ had the highest capacity for As(III) at 0.48 mmole g-1. Activated Carbon held 0,27 mmol g-1 of As(V). The authors were able to achieve a viable filtration system using either batch or continuous flow systems. The continuous flow design will have a clear advantage over batch filtration in an industrial or municipal setting. The filter systems used in this project, called Ichemisorbtivel by the authors, are multi-function filter systems containing absorptive ion exchange filters. These 8 mm thick filters contain activated carbon, cationic and anionic resin, cellulose fibers, chemically active Cu++ and a support medium. Chemisorbtive filters made with other ions, such as Ag+, Mg2+, Al3+ and Fe3+ were less effective in removing arsenic compounds from the water. There was a limit to how high the initial arsenic concentration could be before arsenic appeared in the filter eff

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