Ngày nhận bài: 11-04-2017 / Ngày duyệt đăng: 12-05-2017
In this study, nano MnO2catalysts were synthesized from manganese sulfate and potassium permanganate by the co-precipitation method at room temperature. The characterization of the product was performed by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), energy dispersive analysis of X-rays (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that this material had a small particle size about 0.5 µm and surface area about 113.0601 m2/g. Slurries taken from the pig farm after anaerobic digestion of livestock disposals were treated with nano MnO2catalysts in the laboratory. The results showed that the ozonation with nano MnO2catalyst occurred rapidly than ozonation reaction without catalyst. For livestock’s slurry treatment, the catalytic ozonation with 0,02 g/l could reduce the COD demand from 1138.64 mg/l to 43.27 mg/l with 96.20% efficiency. Therefore, the ozonation with nano MnO2catalysts can be considered as an effective and feasible means for treating the livestock’s wastewater after anaerobic digestion.
