Yang Shao-Xi, Feng Yu-Jie, Wan Jia-Feng, Lin Qing-Ying, Zhu Wan-Peng, Jiang Zhan-Peng
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
J Environ Sci (China). 2005;17(4):623-6.
The pretreatment technology of wet air oxidation (WAO) and coagulation and acidic hydrolysis for apramycin wastewater was investigated in this paper. The COD, apramycin, NH4+ concentration, and the ratio of BOD5/COD were analyzed, and the color and odor of the effluent were observed. WAO of apramycin wastewater, without catalyst and with RuO2/Al2O3 and RuO2-CeO2/Al2O3 catalysts, was carried out at degradation temperature of 200 degrees C and the total pressure of 4 MPa in a 1 L batch reactor. The result showed that the apramycin removals were respectively 50.2% and 55.0%, COD removals were 40.0% and 46.0%, and the ratio of BOD5/COD was increased to 0.49 and 0.54 with RuO2/Al2O3 and RuO2-CeO2/Al2O3 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 BOD5/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. HO2 may promote organic compounds oxidized in WAO of the apramycin wastewater. The addition of CeO2 could promote the activity and stability of RuO2/Al2O3 in WAO of apramycin wastewater.
本文研究了湿空气氧化（WAO）、混凝和酸性水解预处理阿普拉霉素废水的工艺。分析了化学需氧量（COD）、阿普拉霉素、铵离子（NH₄⁺）浓度以及五日生化需氧量（BOD₅）与COD的比值，并观察了出水的颜色和气味。在1L间歇式反应器中，于200℃的降解温度和4MPa的总压力下，对阿普拉霉素废水进行了无催化剂、添加RuO₂/Al₂O₃和RuO₂-CeO₂/Al₂O₃催化剂的湿空气氧化实验。结果表明，在催化湿式空气氧化（CWAO）中，反应150min后，使用RuO₂/Al₂O₃和RuO₂-CeO₂/Al₂O₃催化剂时，阿普拉霉素的去除率分别为50.2%和55.0%，COD去除率为40.0%和46.0%，BOD₅与COD的比值分别提高到0.49和0.54。经过混凝和酸性水解预处理后，COD和阿普拉霉素的去除率略有下降，BOD₅与COD的比值提高到0.45，且出水不适于生物处理。采用WAO能有效控制废水的颜色和气味，明显缩短反应时间。HO₂可能促进阿普拉霉素废水WAO中有机化合物的氧化。添加CeO₂可提高RuO₂/Al₂O₃在阿普拉霉素废水WAO中的活性和稳定性。
