The removal of cadmium and turbidity from contaminated soil-washing water was studied by dissolved air flotation (DAF) and electroflotation at laboratory scale by using sodium lauryl sulfate (SLS) as an anionic surfactant, and calcium hydroxide (Ca(OH)2) as a coagulant. Using DAF, and in the presence of SLS or Ca(OH)2, the maximum recovery rate of cadmium obtained at a stoichiometric cadmium to collector and coagulant ratio of 1:4.5 was 51.1% and 80.8%, while the removal rate of turbidity was 18.4% and 19.2%. However, satisfactory cadmium and turbidity removal was not obtained by DAF. Much more significant removal of cadmium (100%, not detected in the residual) and turbidity (95.7%) was obtained by electroflotation using an aluminium metal plate as electrode, which generated hydroxide and aluminum ion. As a consequence, electroflotation is considered an effective method to separate cadmium and turbidity from contaminated soil-washing water. The electroflotation process may have practical applications for the removal of other hazardous metals from contaminated soil-washing water.
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Research Article|
December 01 2002
Simultaneous removal of cadmium and turbidity in contaminated soil-washing water by DAF and electroflotation
J. Park;
J. Park
*School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, 151-742, Korea
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Y. Jung;
Y. Jung
*School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, 151-742, Korea
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M. Han;
M. Han
*School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, 151-742, Korea
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S. Lee
S. Lee
**School of Environmental Engineering, Chosun University, Kwangju, 501-759, Korea
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Water Sci Technol (2002) 46 (11-12): 225–230.
Citation
J. Park, Y. Jung, M. Han, S. Lee; Simultaneous removal of cadmium and turbidity in contaminated soil-washing water by DAF and electroflotation. Water Sci Technol 1 December 2002; 46 (11-12): 225–230. doi: https://doi.org/10.2166/wst.2002.0742
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