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The Times of India

World

TOI World Desk

United States sewers hide $13 million in metals per million residents, including an estimated $2.6 million in gold and silver

Researchers studying sewage sludge from wastewater treatment plants across the United States estimated that the metals contained in the waste could be worth up to $13 million annually for a community of one million people. According to Environmental Science and Technology , $2.6 million of the estimated value came from gold and silver, according to a study that examined the concentration, origin and potential economic value of metals accumulating in municipal sewage sludge. The estimate reflects the combined value of metals present in the large volumes of biosolids produced by wastewater treatment.

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