As a rule, during heavy torrential rains, water either absorbs into the ground, or goes into the sewage system. But it could be used as a source of drinking water – especially in the arid regions of the world's plains.
A team of researchers at the University of California at Berkeley developed a water filter consisting of ordinary sand mixed with two kinds of natural manganese. Interacting with each other, these ingredients are converted into a man-made oxide that is harmless to man (MnO2).
Water contaminated with herbicides, pesticides or plastic chemicals – bisphenol, passing through such a sand filter, reacts with manganese oxide. Harmful chemicals “connect”, leaving water on “freedom.” At the same time, they are broken up into small, less toxic chemical fragments, which during the secondary purification process are easily biodegradable.
Naturally, in the process of repeated use, the efficiency of the filter is reduced, but it can be “recharged” by thoroughly rinsing with industrial water. According to calculations, a half-meter layer of sand can be renewed, passing through it water with a chlorine content of 25: 1,000,000 for two days.
According to scientists, in future the sand filter can be placed above the aquifers for the purification of storm sewage. While the new technology is going to be tested on rainwater from a stream in Sonoma County (USA).js.src = “&version=v2.8”; 'script', 'facebook-jssdk'));