Econ. Environ. Geol. 2006; 39(2): 151-162
Published online April 30, 2006
© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY
Characteristics of Groundwater Quality in a Riverbank Filtration Area
Correspondence to : Nam C. Woo
Abstract
Characteristics and changes of groundwater quality were investigated in a riverbank filtration area at Daesan-myeon, Changwon City, Korea. The total dissolved solids (TDS) in groundwater samples collected in October were much less than that in March, indicating the mixing with recharged water from precipitation, as well as the changes of dissolved oxygen profiles at monitoring wells from March to October. Redox processes at depths appeared to trigger Fe and Mn contamination of groundwater in riverbank deposits. Amorphous oxyhydroxides and carbonate minerals such as MnCO3 were probably the reactive phases for dissolved Fe and Mn, respectively. Groundwater contamination by nitrate-nitrogen (NO3-N) was controlled by the redox processes and subsequent denitrification at the sampled depths. Distribution of NO3-N concentrations at monitoring wells suggested that the nitrate contaminants were originated from
agricultural facilities on the riverbank deposits. Some of monitoring wells, DS-2, D-2, DS-3, SJ-1, and SJ-3, were only partially penetrated into the sand/gravel aquifer, and subsequently, could not fully function to detect the water quality changes for the pumping wells. Proper measures, with regulating agricultural activities in the riverbank deposits, should be carried out to prevent groundwater contamination of the riverbank filtration area.
Keywords Riverbank Filtration, Redox, Fe, Mn, Nitrate-nitrogen, Dissolved Oxygen
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Econ. Environ. Geol. 2006; 39(2): 151-162
Published online April 30, 2006
Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.
Characteristics of Groundwater Quality in a Riverbank Filtration Area
Seung Gyu Hyun1, Nam C. Woo1*, Woosik Shin2 and Se-yeong Hamm3
1Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
2Eco Solutions Co. Ltd., Seoul 150-946, Korea
3Department of Geology, Pusan National University, Pusan 609-735, Korea
Correspondence to:
Nam C. Woo
Abstract
Characteristics and changes of groundwater quality were investigated in a riverbank filtration area at Daesan-myeon, Changwon City, Korea. The total dissolved solids (TDS) in groundwater samples collected in October were much less than that in March, indicating the mixing with recharged water from precipitation, as well as the changes of dissolved oxygen profiles at monitoring wells from March to October. Redox processes at depths appeared to trigger Fe and Mn contamination of groundwater in riverbank deposits. Amorphous oxyhydroxides and carbonate minerals such as MnCO3 were probably the reactive phases for dissolved Fe and Mn, respectively. Groundwater contamination by nitrate-nitrogen (NO3-N) was controlled by the redox processes and subsequent denitrification at the sampled depths. Distribution of NO3-N concentrations at monitoring wells suggested that the nitrate contaminants were originated from
agricultural facilities on the riverbank deposits. Some of monitoring wells, DS-2, D-2, DS-3, SJ-1, and SJ-3, were only partially penetrated into the sand/gravel aquifer, and subsequently, could not fully function to detect the water quality changes for the pumping wells. Proper measures, with regulating agricultural activities in the riverbank deposits, should be carried out to prevent groundwater contamination of the riverbank filtration area.
Keywords Riverbank Filtration, Redox, Fe, Mn, Nitrate-nitrogen, Dissolved Oxygen
