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Removal of Organic Matters in Pesticide Wastewater by Supercritical Water Oxidation

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Abstract:

Supercritical water oxidation (SCWO) is an alternative to effectively dispose many varieties of organic wastewaters. In this article, a high concentration pesticide wastewater with very complicated components was handled by SCWO in a batch experimental plant at 25 MPa, 410–580 °C within the oxidant coefficient of 1.1–4.0 and the residence time of 1.0–10.0 min. The results show that reaction temperature, oxidant coefficient, residence time can improve XCOD (removal efficiency of chemical oxygen demand) of reactor effluent. XCOD reaches up to 99.89% at 550 °C, 25 MPa with the oxidant coefficient of 3.0 and the residence time of 5.0 min, and the corresponding COD concentration is 73 mg/L. Residence time indicates a relatively more important influence on COD1 at higher reaction temperatures and OCs. Furthermore, possible reaction pathways for SCWO of organic matters in the pesticide wastewater were also proposed primarily.

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Periodical:

Advanced Materials Research (Volumes 955-959)

Pages:

2340-2348

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.955-959.2340

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Online since:

June 2014

Authors:

Dong Hai Xu*, Shu Zhong Wang, Chuan Bao Huang, Xing Ying Tang, Yang Guo, Li Li Qian

Keywords:

Oxidation, Pesticide Wastewater, Removal Efficiency, Supercritical Water

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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