A field study was carried out to investigate the feasibility of a riverbank filtration site using two vertical wells on the Nakdong River, South Korea. The riverbank filtration site was designed to have eleven horizontal collector wells in order to supply 280,000 m 3 /day. This field study provided more insight into the fate of the dissolved organic matter's characteristics during soil passage. The vertical production wells (PWs) were located in different aquifer materials (PW-Sand and PW-Gravel) in order to determine the depth of the laterals for the horizontal collector wells. The turbidity of the riverbank filtrates from the PW-Sand (0.9 NTU) and PW-Gravel (0.7 NTU) was less than 1 NTU, which was the target turbidity of the riverbank filtrate in this study. The iron concentrations were 18.1 ± 0.8 and 25.9 ± 1.3 mg/L for PW-Sand and PW-Gravel respectively, and were higher than those of the land-side groundwater. The biodegradable organic matter-determined biochemical oxygen demand in the river water was reduced by more than 40% during soil passage, indicating that less microbial growth in the riverbank filtrate could be possible. Moreover, the influence of the pumping rates of the vertical wells on the removal of dissolved organic matter and the turbidity was not significant.

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The Water Treatment Plant (WTP) located in South Korea is a 101,000 m³/d water treatment plant using flocculation/coagulation followed by sedimentation and sand filtration plus a final chlorination step to produce drinking water from a natural reservoir. The seasonal occurrence of taste and odor compounds were driving the need for an advanced treatment step. In 2010 the operator decided to carry out pilot tests to test the possibility of removing this compound with a low or medium pressure ultraviolet-based advanced oxidation process (AOP). The pilot test showed a significant lower electrical energy demand (EED) for the low pressure system (EED = 70 W/m³) compared to the medium pressure system (EED = 144 W/m³) to achieve a 0.5 LOG reduction of 2-methylisoborneol. The results of the pilot trials were the basis for the design of the full-scale system capable of treating up to 4,419 m³/h of drinking water using low pressure lamps.

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