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Anodic oxidation with doped diamond electrodes: a new advanced oxidation process
Alexander Kraft1, Manuela Stadelmann, Manfred Blaschke
1Gesimat GmbH, Koepenicker Str. 325, 12555 Berlin, Germany. alexander.kraft@gesimat.de
Journal of Hazardous Materials
|October 24, 2003
Summary
Boron-doped diamond anodes efficiently remove chemical oxygen demand (COD) from wastewater via advanced oxidation processes. This study investigates byproduct formation and economic viability, achieving high current efficiencies.
Area of Science:
- Electrochemistry
- Environmental Science
- Materials Science
Background:
- Boron-doped diamond (BDD) anodes enable direct hydroxyl radical (OH*) production during water electrolysis.
- BDD anodes possess high overpotential for oxygen evolution and excellent mechanical/chemical stability.
- Anodic oxidation using BDD represents a novel advanced oxidation process (AOP) with significant advantages over existing methods.
Purpose of the Study:
- To evaluate the efficacy of BDD anodes for chemical oxygen demand (COD) removal from diverse industrial and synthetic wastewaters.
- To investigate the formation and removal pathways of oxidation byproducts during COD reduction.
- To assess the economic feasibility of BDD-based AOPs for wastewater treatment.
Main Methods:
- Electrochemical oxidation using BDD anodes for wastewater treatment.
- Analysis of COD reduction efficiency and current efficiencies.
- Identification and quantification of oxidation byproducts.
- Economic analysis of the AOP.
Main Results:
- High current efficiencies (85-100%) were achieved for COD removal from various wastewaters.
- The formation and subsequent removal of oxidation byproducts were studied for the first time.
- BDD anodes demonstrated effective pollutant degradation.
Conclusions:
- BDD anodes are highly efficient for COD removal in wastewater treatment via AOP.
- The process offers a promising, cost-effective solution for industrial wastewater remediation.
- Further investigation into byproduct dynamics is crucial for process optimization.