At water treatment plants which filter is used to filter river water
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Answer:
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All drinking water will start off at the water source, which is generally a freshwater lake, river, well, or sometimes even a stream. The first step of treatment is to remove the settleable and dissolved solids suspended in the water. In order to speed the settling and removal process up, chemicals called coagulants are added to the water.
The most common coagulant is aluminum sulfate, but this varies by the water treatment plant. Essentially this chemical has the opposite charge from the suspended solids, like clays or silts, which then neutralizes the charge and allows for the particles to stick together. Now that the solids in the water can begin sticking together, the mixture is slowly mixed in a flocculation basin in order to continue to form what are called floc particles. These floc particles then settle out of the mixture in a sedimentation basin, and cleaner water flows overtop a weir.
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Explanation:
Slow sand filters used to make water drinkable
Indeed, it was the first method used by many towns in the 19th century to treat river and stream water before distributing it. These filters can easily eliminate most of the micro-organisms that cause water-borne diseases, including protozoa, bacteria and viruses.