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Updated: Jul 8, 2026
08:41
Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
Published on: September 7, 2018
Ozonation combined with electrolysis of 1,4-dioxane using a two-compartment electrolytic flow cell with solid
Naoyuki Kishimoto1, Takahiro Nakagawa, Masamichi Asano
1Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan. naoyuki@rins.ryukoku.ac.jp
Water Research
|August 19, 2007
Summary
This study introduces an advanced oxidation process combining ozonation and electrolysis for water treatment, effective even in low-conductivity wastewater. The novel reactor utilizes a solid electrolyte, generating hydroxyl radicals for efficient pollutant degradation.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Advanced Oxidation Processes
Background:
- Ozonation combined with electrolysis (ozone-electrolysis) is an emerging advanced oxidation process for water treatment.
- Conventional ozone-electrolysis requires high electrical conductivity (EC) in wastewater, limiting its application.
- Existing methods often necessitate additional reagents like hydrogen peroxide or ferrous salts.
Purpose of the Study:
- To develop an ozone-electrolysis reactor capable of treating wastewater with low electrical conductivity.
- To investigate the generation of hydroxyl radicals (.OH) during the cathodic reduction of ozone.
- To confirm the contribution of hydroxyl radicals to the degradation of 1,4-dioxane.
Main Methods:
- Development of a novel ozone-electrolysis reactor utilizing a cation exchange membrane as a solid electrolyte.
- Experimental analysis of hydroxyl radical generation through cathodic reduction of ozone.
- Competitive kinetics analysis using a mixed solution of 1,4-dioxane and tert-butyl alcohol.
- Application testing on low-conductivity 1,4-dioxane solutions and treated landfill leachate.
Main Results:
- Successful generation of hydroxyl radicals (.OH) via the cathodic reduction of ozone was experimentally confirmed.
- Hydroxyl radicals were identified as the primary species responsible for the degradation of 1,4-dioxane.
- The developed ozone-electrolysis reactor effectively treated 1,4-dioxane in solutions with EC as low as 0.30 microS/cm.
- The reactor also demonstrated efficacy in treating landfill leachate with an EC of 0.06 mS/cm.
Conclusions:
- A novel ozone-electrolysis reactor using a solid electrolyte is effective for treating low-conductivity wastewater.
- The process efficiently degrades pollutants like 1,4-dioxane through hydroxyl radical generation.
- The use of a solid electrolyte significantly reduces the required electrical power, enhancing process efficiency.
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