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Citation
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HERO ID
1812703
Reference Type
Journal Article
Title
Supercritical water oxidation of tannery sludge: Stabilization of chromium and destruction of organics
Author(s)
Zou, D; Chi, Y; Dong, J; Fu, C; Wang, F; Ni, M
Year
2013
Is Peer Reviewed?
Yes
Journal
Chemosphere
ISSN:
0045-6535
EISSN:
1879-1298
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Location
OXFORD
Page Numbers
1413-1418
Language
English
PMID
23916746
DOI
10.1016/j.chemosphere.2013.07.009
Web of Science Id
WOS:000326858100021
URL
https://linkinghub.elsevier.com/retrieve/pii/S0045653513009934
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Abstract
The supercritical water oxidation (SCWO) of industrial tannery sludge was investigated to understand the simultaneous destruction of organic pollutants and recovery of high content chromium. Experiments were performed in a batch reactor at temperatures of 350-500°C, reaction time of 150-300s and different oxygen ratios, to exhibit the effect of operation conditions. Results showed that removal efficiency of chemical oxygen demand (COD) increased with higher temperature, larger oxidant amount and reaction time; a maximum value of 96% was obtained. Meanwhile, destruction yield was much higher under supercritical conditions than that in subcritical water. In addition, removal efficiency of Cr from sludge reached more than 98% under all conditions; higher temperature played a positive role. Further, leaching toxicity tests of heavy metals in solid products were conducted based on toxicity characteristic leaching procedure. All heavy metals except nickel showed a greatly reduced leaching toxicity through their stabilization. The chromium oxide recovered in ash was amorphous below 550°C, so that the structure of Cr could not be identified by X-ray diffraction pattern. Special attention should be paid on nickel as its leaching toxicity increased due to the corrosion of reactor surface under severe reaction conditions.
Tags
IRIS
•
Chromium VI
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Excluded
Other Not Pertinent
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June 2013 - January 2014
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