Why does the speed of the incoming wastewater slow down in grit and sand removal tank
Answers
Flow of waste water is slowed down considerably during the ‘screening process’ in water recycling. Industrial grade sieves or filters are used to separate grit and sand from the waste water, slowing down the flow.
Screening is followed by settling, biological treatment, osmotic treatment and disinfection. Recycled water is mostly used for household cleaning, gardening, industrial purpose etc. In certain countries, it is cleaned to such an extent, that it is used as potable water.
Wastewater is nothing but water getting contaminated in oil, black brown water that comes from sink, shower, laundry, and from many other usage.
This water is realized everywhere whether at work place or at home like hospitals, industries, and other ways and this water is not safe for drinking.
Hence, it has to be cleaned for drinking purpose or recycled for other usage like watering the plants, toilets, etc
This wastewater passes through bar screens and each and every component is separated, so that it can be recycled as per waste.
Water then is allowed to pass through grit and sand removable tank.
The speed is decreased for sand, grit and pebbles and any other composite to settle down.
The water is then allowed to settle in larger tank which is sloped towards middle.
Solids particles like faeces settle down at the bottom which are then removed with a scraper.
This is known as sludge.
The floatable composite like grease, oil are removed with skimmer and this is the way water is cleared and is called as clarified water.