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Waste flowing channels towns seem to be the least likely place where it could run into wealth. But US scientists say that it is in the sewers and waste they struck gold. According to the researchers from Arizona State University in metals can be "mined" from waste sludge recipes drains recipes milionového city each year to $ 13 million (about 321 million), including gold and silver valued at $ 2.6 million. That will occur in waste metals is already known for some time. But scientists at Arizona State University have put the work quantifying their value. Waste water flows into the water supply and toilets, and mixed waste from industrial production, rainwater from gutters and anything that people are discharged from the sink. Scientists collected samples of the mixture throughout America and measured the content of metals in them. According to the principal author of the study Paul Westerhoff is the metal content is such that it is able to pay its extraction. Indeed, one city in Japan already do this type of "mining" released; Suwy residents in Nagano Prefecture recipes reportedly receive two kilograms of gold from each ton of ash remaining after incineration of sewage sludge.
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