Synergetic effect of copper-plating wastewater as a catalyst for the destruction of acrylonitrile wastewater in supercritical water oxidation

Title
Synergetic effect of copper-plating wastewater as a catalyst for the destruction of acrylonitrile wastewater in supercritical water oxidation
Authors
신영호이홍식이영호김재훈김재덕이윤우
Keywords
supercritical; water; oxidation; acrylonitrile; Copper-plating wastewater; Copper oxide; Supercritical water oxidation
Issue Date
2009-08
Publisher
Journal of hazardous materials
Citation
VOL 167, NO 1-3, 824-829
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/35289
ISSN
0304-3894
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE