Author(s): Park J, Jung Y, Han M, Lee S
Abstract Share this page
Abstract 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.
This article was published in Water Sci Technol
and referenced in Hydrology: Current Research