Research Papers by Kwang-Ho Choo

A combination of coagulation and ultrafiltration (UF) processes for textile wastewater reclamation was investigated using various types of coagulating chemicals such as polyamine, alum, polyaluminum chloride (PACl), and ferric salts. The potential of the combined system was evaluated to replace the

The removal of nitrate from contaminated groundwater via polyelectrolyte-enhanced ultrafiltration (UF) was investigated using different chelating polymers and membrane pore sizes. Although the percentage polymer rejection by membranes slightly decreased with higher chelating polyelectrolyte dosages,

The performance of nanofiltration (NF) with the addition of poly (acrylic acid) (PAA) for treatment of strontiumbearing nuclear wastewater was investigated using different NF membranes at various pH levels and PAA/Sr ratios. Greater Sr removal at elevated pH was attributed to the formation of SrCO3(

Coagulation with only rapid mixing in a separate tank (ordinary coagulation) and coagulation with no mixing tank (in-line coagulation) were applied prior to ultrafiltration with an inside-out type hollow fiber membrane. In result the filterability at the former conditions was superior in both the cr

A performance of an energy-efficient reverse osmosis (RO) system for seawater desalination was evaluated. The evaluation focused on energy saving performance of the RO system. The strategy adopted was to induce high recovery (50%) through the pressure increase. For this purpose, a pilot-scale RO pla