Researchers at RMIT University, in collaboration with South East Water and Manipal University, have developed a method that recycles the acidic liquid waste generated during the recovery process, rather than throwing it away. The team’s innovation makes it possible to extract, purify and recover precious metals such as copper and zinc from sewage sludge treated with biological waste.
The resulting substances do not contain leachable heavy metals and retain valuable nutrients for applications on land. In addition, with additional processing, they can be converted into high-quality biochar, a renewable energy source, with a variety of applications, including fertilizer.
The researchers plan to work with water authorities to implement heavy metal removal methods.
Source: Ferra
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