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Typical removal treatments involve co-precipitation and/or adsorption onto metal hydroxide floc particles. They utilize some form of filtration, permeable membrane, or inclined plate or tube settler to remove the light and fluffy floc particles. These processes all suffer from persistent plugging and fouling issues, especially when moderate to high levels of suspended solids and other reactive contaminants are present. System cleaning and backflush requirements can be high resulting in a loss of treatment productivity.
The CoMag™ process is unique in its high performance and efficient removal of arsenic in that it depends on no physical barriers that can plug or foul.
CoMag™ maximizes the effectiveness of both arsenic removal mechanisms: co-precipitation and adsorption:
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Co-precipitation – CoMag™ employs high-rate ballasted flocculation in its integrated clarifier to efficiently remove precipitated arsenic and metal hydroxide flocs. |
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Adsorption – The CoMag™ process also recycles the metal hydroxide floc and ballast back to its integrated reaction tanks to maintain a dense, gelatinous, metal hydroxide “floc mass”; resulting in a high attachment rate of dissolved forms of arsenic. |
The CoMag™ process has successfully removed greater than 90% of the total arsenic from contaminated groundwater at a hazardous waste site. CoMag™ also removed significant concentrations of total arsenic from raw landfill leachate at a site which had influent arsenic levels greater than1,000 ug/L. This was accomplished while treating leachate with a very high organics content and several competing chemical process interference.
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