Water Depollution and the Odor Control by Wet Air Catalytic Oxidation of Ammonia, Sulfides and Mercaptans of Industrial Wastewaters
Статья (Full article),
Biannual International Conference on Environmental Odour Monitoring and Control
22-24 сент. 2010
Chemical Engineering Transactions
Институт катализа им. Г.К. Борескова СО РАН
Catalytic properties of the carbon material Sibunit (commercial samples) and ceria- and zirconia-promoted precious metals (Ru, Pt, Pd) supported on carbon were studied in the processes of the catalytic wet air oxidation (CWAO) of number toxic odour compounds at elevated pressures and temperatures (T=160 – 250oC, PO2 =0.3 - 1.0 MPa). A possibility of the creation of effective ruthenium catalysts Ru-CeO2/Sibunit and Ru-ZrO2-CeO2/Sibunit with a low ruthenium content (~0.6% Ru) for the deep cleaning of the polluted waters at the moderate temperatures and the odor prevention is demonstrated. The described catalysts and method are solving the problem of the development of the environmentally reliable method for the reatment of the fluids and allow carrying out the adsorption of the pollutants on the carbon catalyst with the following regeneration of the carbon catalyst without the loss of adsorptive qualities. The experiments have shown a principal capability simultaneously to use the carbon catalyst as the adsorbent and either as the catalyst, or as the catalyst support for oxidation of the odorous substances in water solutions. The catalysts allow: a) to decrease the mineralization emperature for typical organic pollutants from 200–240oC to 160oC, and b) to increase the activity of the low ruthenium content catalyst. The full cleaning (more than 99,99 %) is possible at the continuous realization of the process in the unsteady conditions.