| Title |
Application of a Pilot-Scale Electrodialysis System for Groundwater Polluted with Arsenic and Manganese |
| Authors |
최수영 ( Su Young Choi ) ; 권민욱 ( Min Wook Kwon ) ; 박기영 ( Ki Young Park ) ; 차호영 ( Ho Young Cha ) ; 김희준 ( Hee Jun Kim ) ; 권지향 ( Ji Hyang Kweon ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.3.334 |
| Keywords |
Arsenic; Electrodialysis，Groundwater; Ion exchange membrane，Manganese |
| Abstract |
A pilot-scale electrodialysis system was designed and constructed to treat groundwater polluted with arsenic and manganese. Synthetic groundwater, in which some amount of arsenic (As) and manganese (Mn) were added to a final concentration of 500 mg/L of Mn and 50 pg/L of As, was used as a feed for the ED system. The limiting current density, linear water velocity, applied voltage, and membrane surface area were investigated to obtain the efficient and economic operation of the ED system. The linear water velocity increased from 0.74 cm/s to 1 lcm/s, based on the evaluation of limiting current density. Using the ED system with 14 pairs of ion exchange membranes, the water quality of the diluate after 85 minutes of operation satisfied the water quality criteria for drinking water. Increasing the membrane pairs to 21 and 42 pairs was effective in reducing the conductivities of the diluate. The operation cost of the ED system was assessed using specific energy consumption, which was 1.065~ 1.2 kWli/m3. Considering low salt concentrations of the groundwater, increases in current utilization and low voltage applications are required when the ED system is used to produce drinking water. |