Removing heavy metals from polluted surface water with a tannin-based flocculant agent
J. Beltrán Heredia1, ,
J. Sánchez Martín,
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doi:10.1016/j.jhazmat.2008.09.104
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Abstract
Many environmental and health problems come from the presence of metals in surface water. Effectiveness of a new commercial tannin-based flocculant has been tested in order to remove Zn2+, Ni2+ and Cu2+ by coagulation–flocculation process. pH has been adjusted in order to evaluate the real heavy metal removal due just to flocculant effect and not to hydroxide precipitation. At least a 75% of metal removal has been reported in every case, depending on pH value. Flocculant doses have been reported to be about 100–150 ppm.