explain the step of purification of water at water treatment plant
Answers
There is 5steps for water purification. Screening, coagulation, sedimentation, filtration and disinfection.
1) Screening: Water from the river or land passes through the screen as it enters the water treatment plant.
2)Coagulation: This floc pulls the dirt particles, making it eventually heavy enough to sink to the bottom of the water storage tank.
3)Sedimentaion: Water and floc flow into moisture deposition. When the water sits there, the heavy floc settles down on the bottom, where they remain until the removal.
4)Filtration: Water passes through a layer of gravel, sand and may be charcoal, which works to filter the remaining particles. The pebble layer is usually about 1 foot and the sand layer is about 2½ feet deep.
5) Disinfection.
Water enters the closed tank or closed reservoir. Chlorine or other extermination chemicals kill any remaining microorganisms or bacteria in the water and helps maintain clean water up to distribution. If the water treatment facility uses groundwater as the only source of water, disinfection may be the only step required to treat the water adequately. After it is disinfected, purified water is located in a closed tank or reservoir until it flows through the pipes to the home and business.
secondary purification in the sewage system
In primary purification only remove the solid waste.
In secondary purification with the help of microorganisms,bacteria are purified water.