In situ iron-manganese removal by the oxygenized water injection at the river bank filtration site

다국어 초록 (Multilingual Abstract)

High concentration of Fe<SUP>2+</SUP>+ and Mn<SUP>2+</SUP>+ in groundwater at the river bank filtration site increases the treatment cost and reduces the lifetime of the treatment facilities. In situ iron-manganese removal tests, creating an oxidizing zone by oxygenized water, were conducted to examine. Dissolved oxygen (DO) concentrations for injection and pumping water were maintained at about 30 mg/L and <SUP>2+</SUP>5 mg/L, respectively. When the oxygenized water was injected, an oxidizing zone was formed around the injection and pumping wells. While the concentration of Fe<SUP>2+</SUP>+ decreased rapidly and substantially, the decrease of Mn<SUP>2+</SUP>+ concentration was relatively slow but continuous. The step injection test, which was performed for 150 hours by gradually increasing the injection rate of oxidized water to 30% of the pumping rate, showed the lowest Fe<SUP>2+</SUP>+ and Mn<SUP>2+</SUP>+ concentrations after 50 hours. These low values were kept till the end of the test. Even though the DO level declined again as soon as the injection was stopped, Fe<SUP>2+</SUP>+ and Mn<SUP>2+</SUP>+ showed very low concentrations for a while. The low concentrations of Fe<SUP>2+</SUP>+ and Mn<SUP>2+</SUP>+ were maintained below 0.3 mg/L for 1<SUP>2+</SUP> hours and for 43 hours respectively, after stopping the injection test. This study suggests that the distance and the exact locations of injection and pumping wells, the relationship between injection and pumping rates, the distribution of aquifer, and the reaction time for reducing the concentration should be considered for an optimal design of the injection system.

참고문헌 (Reference)

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