Brewer’s yeast helps recover metals from e-waste. Austrian researchers have found a way to selectively capture metals from a waste stream using spent brewer’s yeast, the same beer byproduct that goes into the food spread Marmite.

In a paper published in the journal Frontiers in Bioengineering and Biotechnology, the scientists explain that electronic waste is notoriously difficult to recycle because it’s hard to separate the different metals in the waste from each other.

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“Getting the metals in solution is a first step, but the selective recovery of the metals remains a challenge. Compared to processes such as chemical precipitation, biosorption using spent brewer’s yeast presents a cheap and environmentally friendly approach,” Klemens Kremser of the University of Natural Resources and Life Sciences, Vienna, and corresponding author of the article, said in a media statement.

Several options already exist for separating the different component metals of electronic waste, including other biosorbents—biological materials that can be used to soak up pollution. However, they all have significant downsides. For instance, chemical precipitation produces contaminated slag, while biochar—a biosorbent that is similar to charcoal—is difficult to separate from wastewater.

So the scientists turned to brewer’s yeast.

Read more at Mining.com