| Abstract [eng] |
In this master's thesis the removal of Zn2+, Ni2+, Pb2+ and Cr(VI) ions from galvanic plant wastewaters by electrocoagulation method was studied. Alternative technologies, electrocoagulation process operation and its advantages are discussed in the literature review. Firstly the results of electrolysis time and current density influence were analyzed and discussed. The optimal process conditions, energy and electrode material consumption for solution containing one removable metal ion was selected. While treating solutions containing one metal ion these removal efficiencies had been reached: Zn2+ – 99.6%, Ni2+ ~100%, Pb2+ ~100% and Cr(VI) – 89.5%~100%. Evaluation results showed that kinetic curves adapt one of the following kinetic models: pseudo first, pseudo second and Elovich. Model mixture solutions contain: • Zn2+ 120 – 203 mg/l, • Ni2+ 100 – 280 mg/l, • Pb2+ 6 – 16 mg/l • Cr(VI) 13 – 16 mg/l. 100 % removal efficiency was reached when applied current density was 25 mA/cm2 and electrolysis duration was between 60 and 90 minutes In the end of this work technological recomendations for galvanic wastewater treatment of Zn2+, Ni2+, Pb2+ and Cr(VI) metal ions using electrocoagulation process were proposed. |
