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Full‐Scale Implementation of Second‐Stage Contactors for Manganese Removal
Author(s) -
Bazilio Arianne A.,
Kaminski Gary S.,
Larsen Yesher,
Mai Xuyen,
Tobiason John E.
Publication year - 2016
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.5942/jawwa.2016.108.0184
Subject(s) - manganese , contactor , effluent , chemistry , rotating biological contactor , trihalomethane , water treatment , turbidity , haloacetic acids , chlorine , sorption , environmental chemistry , environmental engineering , adsorption , environmental science , power (physics) , physics , oceanography , organic chemistry , quantum mechanics , geology
The use of post‐filtration contactors for the removal of manganese (Mn) in the dissolved, reduced form (Mn 2+ 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/ft 2 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.