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There’s $13 Million In Your Sewer Sludge. Really

Researchers at Arizona State University estimate that in a city of one million people, $13 million dollars worth of metals could be accumulating annually in sludge, the byproduct of treated sewage, according to an article in Money.

The study, which analyzed sludge from treatment centers in Arizona and samples from across the country stored at the U.S. National Biosolids Repository, focused on 13 minerals with the highest value, including gold, silver, copper, and platinum. If every bit of the metals is retrieved, researchers reported there could be $280 per ton of sludge

The concentration of metals in sludge, however, could pose environmental risks, so finding a way to extract them would help mitigate the effects of the gold flush — err, rush. In 2009, a waste treatment facility in central Japan managed to extract nearly 2 kilograms of gold from the ash of incinerated sludge, which was more than the amount pulled from Japan’s Hishikari Mine, one of the world’s top gold mines.



Read the entire article from 23 January on Money’s website


Energiaskor 2015-01-30

 

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