Affiliations: Department of Environmental Science and Engineering,
Tsinghua University, Beijing 100084, China | School of Municipal and Environmental Engineering,
Harbin Institute of Technology, Harbin 150001, China
Abstract: 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/Al_2O_3
and
RuO_2-CeO_2/Al_2O_3
catalysts, was carried out at degradation temperature of 200°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 BOD_5/COD was increased to 0.49
and 0.54 with
RuO_2/Al_2O_3 and
RuO_2-CeO_2/Al_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· 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/Al_2O__3 in WAO
of apramycin wastewater.
Keywords: catalytic wet air oxidation (CWAO), metal catalyst, antibiotic production wastewater, apramycin wastewater
