Introduction
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Anodic oxidation is a promising advanced oxidation technology in wastewater treatment. We develop novel electrocatalytic anodes and reactors for effective treatment of industrial wastewater. Organic pollutants in wastewater can be effectively oxidized by direct electron transfer on the anode surface or indirectly oxidized by generated •OH or other oxidizing agents generated in situ such as sulphate radicals and free chlorine.
Competitive advantage
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- Anodic process needs no external addition of chemicals thereby preventing secondary pollution problems.
- We developed a number of more competitive catalytic anodes than commercial-available electrodes (i.e., Ti4O7, SnO2, RuO2/Ir and IrO2/Ta), with lower material cost and excellent organic pollutant removal performance.
- CFD model can be built to help predict local fluid field, understand the electrochemical reaction mechanism, and predict the impact of electrode and reactor design. Our CFD simulation optimized the operation parameters of anodic process and enhanced 20% pollutant removal and 30% reduction of the electric energy consumption.
Applications
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- Metal plating wastewater. Anodic process is suitable for the treatment of plating wastewater that contains refractory metal-complex compounds. The CTET-developed anodic oxidation process can degrade >90% organic chelating agents such as EDTA and recover ~90% metals on cathode surface. The electric energy consumption of the process is lower than 10 kWh/m3. The process shows great potentials to recover valuable metal resources from plating wastewater.
- Concentrated traditional Chinese medicine wastewater. Traditional Chinese medicine wastewater often contains multiple types of biologically toxic compounds. The CTET-developed anodic oxidation process shows excellent toxicity removal performance for aconitine wastewater. The HgCl equivalent concentration of treated wastewater was significantly lower than the discharge standard at 0.07 mg/L.
- Other high-salinity industrial wastewater. Anodic process can also be used for organics removal in other high-salinity industrial wastewater such as RO concentrate.
