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Full‐Scale Implementation of Second‐Stage Contactors for Manganese Removal
The use of post‐filtration contactors for the removal of manganese (Mn) in the dissolved, reduced form (Mn2+ or Mn(II)) by sorption to manganese oxide–coated granular media and catalytic oxidation by free chlorine was implemented at the Lantern Hill Water Treatment Plant in Stonington, Conn., in order to lower disinfection by‐product (DBP) formation while effectively controlling metals. The second‐stage contactors (SSCs) successfully removed Mn at hydraulic loading rates of up to 10 gpm/ft2 with little head loss accumulation and effluent Mn concentrations typically ⩽0.01 mg/L. A mass balance showed similar masses of Mn removed from the water by the SSCs and in the backwash waste (total difference of <10%) during the study period. DBP concentrations were lower than historical concentrations for the plant, with average plant effluent total trihalomethane and five haloacetic acid concentrations of 30 µg/L each. Other treatment goals (e.g., turbidity, iron removal, free chlorine residual) were also successfully achieved.
Full‐Scale Implementation of Second‐Stage Contactors for Manganese Removal
The use of post‐filtration contactors for the removal of manganese (Mn) in the dissolved, reduced form (Mn2+ or Mn(II)) by sorption to manganese oxide–coated granular media and catalytic oxidation by free chlorine was implemented at the Lantern Hill Water Treatment Plant in Stonington, Conn., in order to lower disinfection by‐product (DBP) formation while effectively controlling metals. The second‐stage contactors (SSCs) successfully removed Mn at hydraulic loading rates of up to 10 gpm/ft2 with little head loss accumulation and effluent Mn concentrations typically ⩽0.01 mg/L. A mass balance showed similar masses of Mn removed from the water by the SSCs and in the backwash waste (total difference of <10%) during the study period. DBP concentrations were lower than historical concentrations for the plant, with average plant effluent total trihalomethane and five haloacetic acid concentrations of 30 µg/L each. Other treatment goals (e.g., turbidity, iron removal, free chlorine residual) were also successfully achieved.
Full‐Scale Implementation of Second‐Stage Contactors for Manganese Removal
Bazilio, Arianne A. (author) / Kaminski, Gary S. (author) / Larsen, Yesher (author) / Mai, Xuyen (author) / Tobiason, John E. (author)
Journal ‐ American Water Works Association ; 108 ; E606-E614
2016-12-01
9 pages
Article (Journal)
Electronic Resource
English
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