Removing heavy metals from polluted surface water with a tannin-based flocculant agent.
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 Zn(2+), Ni(2+) and Cu(2+) 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.
Beltrán Heredia
J
J
Department of Chemical Engineering and Physical Chemistry, Universidad de Extremadura, Badajoz, Spain. jbelther@unex.es
Sánchez Martín
J
J
D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000302:isolation & purification*; D013634:Tannins / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D019216:Metals, Heavy; D013634:Tannins; D014874:Water Pollutants, Chemical