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From sewage can mine gold and silver worth millions of dollars - VIDEO PDF Print E-mail
Wednesday, 21 January 2015 10:04

Medieval alchemists sought to turn lead into gold, but for centuries failed. As it turned out, in the XXI century, to extract the precious metals can be of the usual waste of human activity, and even the philosopher's stone for this is not necessary.

It has long been known that many metals are concentrated in the waste water, where the water from the sewage is mixed with industrial waste and stormwater. From year to year have to constantly look for new ways to deal with toxic metals that can get on farmland or in a glass of water to a man.

Now, in the new study, experts from the University of Arizona decided to estimate the concentration and the value of various metals in sewage sludge. These samples were taken from different parts of the USA and the metal content was measured using a mass spectrometer, which can distinguish between different chemical elements signature. As it turned out, a city of one million people per year in the wastewater leaves the metals total cost of $ 13 million, including precious and worth $ 2.6 million.

Lead author of the study environmental engineer Paul Westerhoff (Paul Westerhoff) argues that this finding could help cities who are looking for a way to recoup the expensive disposal. For example, in the Japanese city of Suva experts have tried to extract gold from the wastewater by the purification equipment. Then managed to catch almost 2 kilograms of gold from each ton of ash after incineration of sludge - even more than in some natural deposits.

Although none of the US treatment plants did not follow suit, a new study proves once again the need to rethink the value of wastewater.

Today, about 60% of sewage sludge in the United States already apply in the fields and forests as a fertilizer, but it is still a high risk of contamination from toxic chemicals and pathogens of agricultural land.


НАЖМИТЕ ЗДЕСЬ ДЛЯ ПРОСМОТРА ВСЕГО СПИСКА НОВОСТЕЙ О НЕОБЫЧНЫХ ЯВЛЕНИЯХ>>>

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