|
|
Treatment of high-concentration phenol wastewater by catalytic wet air oxidation |
1. School of Environment, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China)
|
|
|
Abstract Catalytic wet air oxidation (CWAO) of high-concentration phenol wastewater using the prepared catalyst of manganese and cerium oxides was studied in a stirred batch reactor. The effects of the catalyst particle sizes, reaction temperature, oxygen partial pressure in the reaction system, phenol concentrations of the wastewaters, catalyst dosage, and pH value on CODCr removal efficiencies of the wastewater in the CWAO treatment were investigated, respectively. The experimental results show that the internal mass transfer of chemical reaction can be neglected when the catalyst particle size is up to 200 meshes in the experimental conditions. At lower temperatures ( 100 ℃ ) , the wastewater has been ef- fectively treated by CWAO reaction. Oxygen partial pressure only impacts the reaction rate. The final conversion of contaminants in the wastewater is correlated with the ratio of the catalyst dosage to the initial phenol concentration. The weak acidic condition is beneficial to the CWAO treatment of wastewater. The formation of carbonaceous deposits on the catalyst surface result in its deactivation during the CWAO reaction from the results of catalyst characterization.
|
|
|
|
|
|
|
|