Treatment of heavy metal polluted industrial wastewater by a new water treatment process: ballasted electroflocculation

摘要: Abstract This laboratory study investigated the parameters efficiency of new technology: ballasted electro-flocculation (BEF) using aluminum (Al) electrodes to remove cadmium and zinc from industrial mining wastewater (MWW). The principle BEF process is based on use micro-sand polymer together increase weight flocs rate at which they settle radically changing electrocoagulation-electroflocculation settling methodology. Based examination operation one by one, best removal percentage was obtained a current intensity 2 A, flow 20 L/h, dose 6 g/L, polyethyleneimine (PEI) 100 mg, contact times 30 min, stirring speed 50 RPM, monopolar configuration electrodes, an number 10. results showed that density have preponderant effect variability quality settled water. In comparison, filterability found be more sensitive micro sand dosages density. It dependent ratio microsand PEI dosage, improved when this increased. Response surface methodology applied evaluate main effects interactions among speed, dose, intensity, number. Cd Zn MWW done for very low cost 0.1 TND/m3 equivalent 0.04 €/m3. investigation proposes highly cost-effective treatment method if compared Actiflo TM electrocoagulation.