Pretreatment of apramycin wastewater by catalytic wet air oxidation

摘要

The pretreatment technology of wet air oxidation (WAO) and coagulation and acidic hydrolysis for apramycin wastewater was investigated in this paper. The COD, apramycin, NH_4~+ concentration, and the ratio of BOD_5/COD were analyzed, and the color and odor of the effluent were observed. WAO of apramycin wastewater, without catalyst and with RuO_2/AI_2O_3 and RuO_2-CeO_2/AI_2O_3 catalysts, was carried out at degradation temperature of 2001; and the total pressure of 4 MPa in a 1 L batch reactor. The result showed that the apramycin removals were respectively 50.2 percent and 55.0 percent , COD removals were 40.0 percent and 46.0 percent , and the ratio of BOD_5/COD was increased to 0.49 and 0.54 with RuO_2/AI_2O_3 and RuO_2-CeO_2/AI_2O_3 catalysts in catylytic wet air oxidation(CWAO) after the reaction of 150 min. With the pretreatment of coagulation and acidic hydrolysis, COD and apramycin removals were slight decreased, and the ratio of BOD_5/COD was increased to 0.45, and the effluents was not suitable to biological treatment. The color and odor of the wastewater were effectively controlled and the reaction time was obviously shortened with WAO. HO_2 centre dot may promote organic compounds oxidized in WAO of the apramycin wastewater. The addition of CeO_2 could promote the activity and stability of RuO_2/AI_2O_3 in WAO of apramycin wastewater.