The filtration process involves the flow of water through a granular bed, of sand or another suitable media, at a low speed. The medium retains most solid matter while permitting the water to pass. The filtration process is usually repeated to ensure adequate removal of unwanted particles in the water. This type of slow filtration over a granular bed is basically called as slow sand filtration. It is the oldest technique of filtration but still widely used in municipal water treatment plants today.
Once water has been collected from its natural setting, it is brought to a treatment plant to undergo coagulation, a process which removes dirt & other particles in the water. Chemicals are added in to the water to help those substances collect & stick together. Once these particles are collected in the water, they become heavy & sink to the bottom of a sediment tank. The clean water then moves further along the filtration process. The water passes through filters which helps remove even more dirt & particles. For good health, small amounts of chlorine & other disinfectants are used to kill any bacteria or microorganisms that present in the water. Water is stored in a sanitary tank or reservoir for storage & any further sanitation. From there, the water flows through large pipes to homes & businesses throughout the community.
In our next blog we shall learn about effect of water pollution I hope the above explanation was useful.Keep reading and leave your comments.
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