Water Supply Vol 2 No 1 pp 299–304 © IWA Publishing 2002
A study on the removal of toxic metal-EDTA complex using solar light/TiO2 system
I.-H. Cho*, T.-J. Park**, H.-Y. Kim***, K.-D. Zoh**** and H.-K. Lee*****
*Department of Environmental Health and Institute of Health and Environment, School of Public Health, Seoul National University, Seoul, Korea
**Department of Environmental Health and Institute of Health and Environment, School of Public Health, Seoul National University, Seoul, Korea
***Department of Environmental Health and Institute of Health and Environment, School of Public Health, Seoul National University, Seoul, Korea
****Department of Environmental Health and Institute of Health and Environment, School of Public Health, Seoul National University, Seoul, Korea
*****Department of Environmental Health and Institute of Health and Environment, School of Public Health, Seoul National University, Seoul, Korea
ABSTRACT
A circular reactor was placed outdoors to investigate the possibility of using natural sunlight in TiO2 photocatalysis system for the removal of toxic metals (Cd, Cr, Cu, Hg, Ni, Zn) and EDTA complex. The results show that the system containing both solar light and TiO2 more effectively removed metal-EDTA complex than either solar light or TiO2 system alone. The removal of each metal was more than 90% in the presence of TiO2/solar light, and EDTA (TOC basis) was reduced more than 80% in 120 min. Photocatalytic removal efficiency of heavy metal-EDTA increased with increasing TiO2 dosage. However, over 1.5g/L of TiO2 dosage, the efficiency reached a plateau.
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