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Electricity to clean up industrial wastewater

Elizabeth Gracie
Engineers from the University of Sydney have discovered a way to utilise electricity to clean up heavily polluted industrial wastewater.

This includes the development of an electrochemical oxidation process which destroys the contaminants and chemicals present in a toxic body of water.  

According to the University of Sydney, the process involved treating wastewater with electricity using specialised electrodes. These electrodes then discharged electricity which drives oxidation reactions near the electrode surfaces. 

As a result of this process, the organic contaminants present in the wastewater can be transformed into harmless gasses, ions or even minerals. 

Julia Soares, a PhD student involved with the project said that the technique was simple, yet highly effective. 

“We have employed an incredibly powerful process that eliminates even the most persistent non-biodegradable pollutants, such as pharmaceuticals and pesticides, as well as various classes of organic compounds that can be found in many industrial effluents,” said Soares.

“The process is relatively simple, does not require the addition of chemicals or severe operation conditions, and does not produce additional waste streams”. 

The effects of wastewater are wide-reaching and can have a significant detrimental impact on both the health of natural habitats and the many industries who use substantial quantities of water in the processes. 

According to Soares, this makes finding suitable solutions for the reuse or disposal of wastewater very challenging and costly.

The research team hopes that their work will help wineries, pharmaceutical manufacturers and other industries that need to comply with strict wastewater regulations to become cleaner and greener. 

“The electrochemical method that we used can be readily applied to industries that must comply with strict regulations for wastewater disposal, such as pulp and paper processing, wineries, as well as pharmaceutical production facilities,” said Soares. 

Next, the team will carry out research that specifically focuses on contaminants to better understand the chemical reactions and transformations that take place during the electrochemical oxidation procedure. If successful, the process will be upscaled. 
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