Synergetic effect of copper-plating wastewater as a catalyst for the destruction of acrylonitrile wastewater in supercritical water oxidation
- Synergetic effect of copper-plating wastewater as a catalyst for the destruction of acrylonitrile wastewater in supercritical water oxidation
- 신영호; 이홍식; 이영호; 김재훈; 김재덕; 이윤우
- supercritical; water; oxidation; acrylonitrile; Copper-plating wastewater; Copper oxide; Supercritical water oxidation
- Issue Date
- Journal of hazardous materials
- VOL 167, NO 1-3, 824-829
- A new supercritical water oxidation process for the simultaneous treatment of mixed wastewater
containing wastewater from acrylonitrile manufacturing processes and copper-plating processes was
investigated using a continuous tubular reactor system. Experiments were carried out at temperatures
ranging from 400 to 600 ◦C and a pressure of 25MPa. The residence time was fixed at 2 s by changing the
flow rates of feeds, depending on reaction temperature. The initial total organic carbon (TOC) concentration
of the wastewaters and the O2 concentration at the reactor inlet were kept constant at 0.49 and
0.74 mol/L. It was confirmed that the copper-plating wastewater accelerated the TOC conversion of acrylonitrile
wastewater from 17.6% to 67.3% at a temperature of 450 ◦C. Moreover, copper and copper oxide
nanoparticleswere generated in the process of supercriticalwater oxidation(SCWO) of mixedwastewater.
99.8% of copper in mixed wastewater was recovered as solid copper and copper oxides at a temperature
of 600 ◦C, with their average sizes ranging from 150 to 160 nm. Our study showed that SCWO provides
a synergetic effect for simultaneous treatment of acrylonitrile and copper-plating wastewater. During
the reaction, the oxidation rate of acrylonitrile wastewater was enhanced due to the in situ formation
of nano-catalysts of copper and/or copper oxides, while the exothermic decomposition of acrylonitrile
wastewater supplied enough heat for the recovery of solid copper and copper oxides from copper-plating
wastewater. The synergetic effect ofwastewater treatment by the newly proposed SCWO process leads to
full TOC conversion, color removal, detoxification, and odor elimination, aswell as full recovery of copper.
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