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Hydrogen Peroxide Interference in Chemical Oxygen Demand Assessments of Plasma Treated Waters

1
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
2
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA
*
Author to whom correspondence should be addressed.
Plasma 2019, 2(3), 294-302; https://doi.org/10.3390/plasma2030021
Received: 16 May 2019 / Revised: 12 June 2019 / Accepted: 2 July 2019 / Published: 5 July 2019
(This article belongs to the Special Issue Low Temperature Plasma Jets: Physics, Diagnostics and Applications)
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Abstract

Plasma-driven advanced oxidation represents a potential technology to safely re-use waters polluted with recalcitrant contaminants by mineralizing organics via reactions with hydroxyl radicals, thus relieving freshwater stress. The process results in some residual hydrogen peroxide, which can interfere with the standard method for assessing contaminant removal. In this work, methylene blue is used as a model contaminant to present a case in which this interference can impact the measured chemical oxygen demand of samples. Next, the magnitude of this interference is investigated by dosing de-ionized water with hydrogen peroxide via dielectric barrier discharge plasma jet and by solution. The chemical oxygen demand increases with increasing concentration of residual hydrogen peroxide. The interference factor should be considered when assessing the effectiveness of plasma to treat various wastewaters. View Full-Text
Keywords: non-equilibrium plasma applications; water treatment; advanced oxidation non-equilibrium plasma applications; water treatment; advanced oxidation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Groele, J.; Foster, J. Hydrogen Peroxide Interference in Chemical Oxygen Demand Assessments of Plasma Treated Waters. Plasma 2019, 2, 294-302.

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