Minh Pham

Publication Date



This research involved full- and pilot-scale studies of treatment of the Aquarion

Water Company (AWC) Lantern Hill groundwater source. With elevated levels of both

dissolved manganese (~0.19 mg/L), dissolved iron (~1.9 mg/L) and natural organic

matter (NOM) (~3 mg/L) the existing treatment plant is having difficulty in achieving

required manganese removal while maintaining low concentrations of disinfection byproducts

(DBPs) in finished water. At full-scale, dissolved manganese in the raw water is

removed through pre-filter oxidation and adsorption on iron precipitates via application

of free chlorine and permanganate as well as adsorption of dissolved manganese onto


x(s) coated filter media (anthracite and greensand) which is continuously reactivated

by free-chlorine oxidation. The addition of pre-filter chlorine to the raw water with high

concentration of NOM leads to the formation of elevated levels of regulated DBPs such

as trihalomethanes (THMs) and haloacetic acids (HAAs).