Determination of Operating Conditions for Hydrogen Peroxide and Hydroxyl Radical Production in Electro-peroxone Process

Year 2019, Volume: 15 Issue: 3, 235 - 239, 30.09.2019

Özge Dinç , Zeynep Girgin Ersoy Hazal Öztürk Sibel Barışçı

https://doi.org/10.18466/cbayarfbe.395273

Abstract

Electro-peroxone (EPO) process is an enhanced ozonation process with a
simple installation of electro-oxidation apparatus into the ozone reactor. It
enables the use of excess oxygen gas caused by inefficient ozone generation by
ozone generators. The sparged oxygen is reduced to form hydrogen peroxide (H₂O₂)
on the cathode surface and then the electrogenerated H₂O₂ reacts
with ozone to form hydroxyl radical (OH•). Thus, the highly oxidative species
such as OH• and H₂O₂,are produced in the bulk solution. In this study, the effects
of operating conditions such as reaction time, ozone flow rate and the applied
current on the production of oxidant species were discussed. Response Surface
Methodology (RSM) was used for the modeling of reaction conditions. The models
employed were both significant for the production of OH• and H₂O₂.
Reaction time is the most important factor in the production of oxidants. While
the reaction time and ozone flow rate had a synergistic effect on OH•
production, the interaction of the applied flow and the ozone flow rate
affected H₂O₂ production. Optimum operating conditions
were determined maximizing the OH• concentration. The short reaction time of
the process may be preferred because OH• is inhibited by the electrogenerated H₂O₂
at advancing reaction times.

Keywords

Electro-peroxone, advanced oxidation, hydroxyl radical, hydrogen peroxide, response surface methodology

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