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Removal of Natural Organic Matter using Potassium ferrate(VI)  

Lim, Mi-Hee (Division of Civil and Environmental Engineering, Korea Maritime University)
Kim, Myoung-Jin (Division of Civil and Environmental Engineering, Korea Maritime University)
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Abstract
In this research, we synthesized potassium ferrate(VI) acting as an oxidant, disinfectant, and coagulant, and used it to treat natural organic matter(NOM, HA and FA) in river water. The removal efficiencies obtained by $UV_{254}$ ranged from 20.7 to 73.6% for 10 mg/L HA and from 52.6 to 77.5% for 10 mg/L FA in Nakdong river sample as the ferrate dose varied from 2 to 46 mg/L(as Fe). However, the removal efficiencies by TOC analysis ranged from 0 to 20.3% for HA and from 0 to 26.6% for FA at the same ferrate doses. The removal efficiencies of NOM increased either with decreasing pH or with increasing temperature. The removal efficiency of HA by ferrate was comparable to those by traditional coagulants such as $Al_2(SO_4)_3{\cdot}18H_2O$, $FeSO_4{\cdot}7H_2O$, and FeO(OH). The reaction between ferrate and HA reached a steady state within 60 seconds, showing first-order with respect to the reaction time. The removal efficiencies of HA by traditional coagulants were improved by pretreatment of HA using a small amount of ferrate.
Keywords
Natural Organic Matter(NOM); Potassium Ferrate(VI); Drinking-water Treatment; Oxidation; Coagulation;
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Times Cited By KSCI : 1  (Citation Analysis)
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