Tertiary treatment of paper industries effluent with advanced electrochemical oxidation process in the presence of modified bentonite powdery electrodes

摘要

Tertiary treatment was carried out to treat pulp and paper effluent from secondary treatment process by a three-dimensional electrode system equipped with modified bentonites as powdery electrode. The cetyl trimethyl ammonium bromide modified bentonite (CTAB-bent) and hydroxy-aluminum pillared organic bentonite (OH-Al-CTAB-bent) were synthesized and characterized by XRD and FTIR spectroscopy analysis. The impacts such as the dosage of particle electrode, electrolysis times, current density were on the COD removal efficiency and decolorization effect of effluent were also investigated. The results showed that the experiments carried out by three-dimensional electrode system with OH-Al-CTAB-bent were sufficient for the COD and color removal efficiency. A current density of 30 mA/cm~2, electrolysis time of 40min, and the particle electrode dosage of 1.6g/L were selected as an optimum conditions that allows fast and low cost treatment. The effluent can achieve the discharge standard of water pollutants for pulp and paper industry (GB3544-2008) after electrolysis.