Coated sand purifies storm water

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Many cities are beginning to experience shortages of water for at least part of the year. At the same time, most rainwater that falls in built-up areas just runs off the streets and down the sewer drains – rather than percolating into the ground to recharge groundwater aquifers. Herbicides, pesticides, toxic metals and car oil often also contaminate this storm water, making it difficult to reclaim. Now, researchers at UC Berkeley have developed a way to remove contaminants from storm water. The researchers developed a mineral-coated sand that destroys organic pollutants. To create the sand, engineers mixed plain sand with…

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