Application of catalytic wet air oxidation for the treatment of H-acid manufacturing process wastewater.
Four types of powder catalysts whose main active components are copper (Cu), cerium (Ce), cadmium (Cd) and cobalt-bismuthide (Co-Bi) are prepared with the method of the co-deposition and are evaluated through the catalytic wet air oxidation (CWAO) treatment of H-acid solution. The comparison of the efficiencies of different catalysts shows that Ce3Cu1 (3:1) catalyst is the best one. When the reaction temperature is 200 degrees C, oxygen partial pressure is 3 MPa, pH value is 12, and reaction time is 30 min, the COD removal rate is over 90%. All the H-acid is decomposed in 5 min and is oxidized into NH4+, SO4(2-) formic acid, acetic acid and other end products. The pH value can greatly affect the COD removal and the production of organic acid. CWAO process not only can get a high reaction rate, but also can oxidize the short-chain organic acid.
Zhu
Wanpeng
W
Department of Environmental Science and Engineering, Tsinghua University, Beijing, China. zwp-den@mail.tsinghua.edu.cn
Bin
Yuejing
Y
Li
Zhonghe
Z
Jiang
Zhanpeng
Z
Yin
Tong
T
D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D009282:Naphthalenesulfonates / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*
D004396:Coloring Agents; D007220:Industrial Waste; D009282:Naphthalenesulfonates; C450879:1-naphthol-8-amino-3,6-disulfonic acid; D010100:Oxygen