It may be define as a process of separation of solids from a fluid by passing the same through a porous medium that retains the solids but allows the fluid to pass through.
Water filtration process ppt.
Rapid sand filtration is much more common than flow sand filtration because rapid sand filters have fairly high flow rates and require relatively little space to operate.
Kudarha assistant professor m.
Ultrafiltration uf is a variety of membrane filtration in which forces like pressure or concentration gradients lead to a separation through a semipermeable membrane.
The water level above the filter bed is usually kept at two to six feet.
Suspended solids and solutes of high molecular weight are retained in the so called retentate while water and low molecular weight solutes pass through the membrane in the permeate filtrate.
A water softener typically uses sodium or potassium ions to replace calcium and magnesium ions the ions that create hardness.
Cold water should not be used to backwash a hot process.
Exclusion of particles at the surface of the filter media i e.
At ambient temperature the recommended filter backwash rate is 6 8 gpm ft for anthracite and 13 15 gpm ft for sand.
Anthracite filters associated with hot process softeners require a backwash rate of 12 15 gpm ft because the water is less dense at elevated operating temperatures.
Removal takes place by a number of mechanisms that include straining flocculation sedimentation and surface capture.
In filters with a control valve installed on the filter effluent pipe the filter flow is restricted during this time.
When the filtration is started after being backwashed there will be little head loss.
It then flows downward.
Water softeners a water softener is a device that reduces the hardness of the water.
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Rapid sand filtration is a physical process that removes suspended solids from the water.
In fact during rapid sand filtration the water flows at a rate up to 20 metres per.
Filters can be categorised by the main method of capture i e.
A water filter is a device which removes impurities from water by means of a physical barrier chemical and or biological process.
