Research on a new electrochemical method combined with chemical coagulation in removal of lead, zinc, and copper from wastewater

Abstract

2015): Research on a new electrochemical method combined with chemical coagulation in removal of lead, zinc, and copper from wastewater, Desalination and Water Treatment,Research on a new electrochemical method with iron electrodes and aluminum electrodes for removal of lead, zinc, and copper from wastewater was studied. Several parameters such as initial pH, hydraulic retention time, mass of Fe/C, applied voltage, and particle diameter of Fe/C were studied to achieve a high removal capacity. The results indicated that the new electrochemical method using aluminum electrodes or iron electrodes for removal efficiency of lead, zinc, and copper are very high. But the lifetime of aluminum electrodes is smaller than 2.44 times the lifetime of iron electrodes. The optimal condition of the new electrochemical method was achieved in two iron electrodes, an initial pH of 4-6, a hydraulic retention time of 75 min, a mass of Fe/C of 125 g, an applied voltage of 10 V, and a particle diameter of Fe/C of 20-27 mesh. At this optimal condition and the initial concentration of ions of 50 mg/L, the residual concentration of lead, zinc, and copper are 0.548, 0.886, and 0.588 mg/L, respectively. The treated wastewater continues the use of chemical coagulation method to adjust the solution pH value of 9. After all treatment processes have been completed, the effluent wastewater is very clear and its quality exceeds the direct discharge standard.

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The Study of Cu(II) Adsorption onto Synthetically Modified Geopolymers

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