A team of engineers may be one step closer to cleaning up heavily contaminated industrial wastewater streams.
Researchers from the University of Sydney’s School of Chemical and Biomolecular Engineering developed an electrochemical oxidation process with the aim of cleaning up complex wastewater that contained a toxic cocktail of chemical pollutants.
“Our study, published in Algal Research, involved industrial wastewater that had been heavily contaminated with a cocktail of organic and inorganic species during a biofuel production process”, said Julia Ciarlini Junger Soares, who is completing a PhD in chemical and biomolecular engineering under the supervision of Dr. Alejandro Montoya.
The wastewater, which contained carbon, nitrogen and phosphorus, was generated in a pilot plant, designed by the team for the production of biofuels using naturally abundant microalgae.
The process involved treating wastewater with electricity using specialized electrodes. They discharged electricity, then drove oxidation reactions near the electrode surfaces, transforming the organic contaminants into harmless gasses, ions or minerals.
“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,” Soares said.
According to the researchers, the process is relatively simple, does not require the addition of chemicals or severe operation conditions, and does not produce additional waste streams.
“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,” Soares said.
The team will soon carry out research focused on specific contaminants to better understand the chemical transformations that take place during electrochemical oxidation and will upscale the process.
