Water Filtration Process Ppt

Cold water should not be used to backwash a hot process.

Water filtration process ppt.

The water level above the filter bed is usually kept at two to six feet. 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. Exclusion of particles at the surface of the filter media i e.

Removal takes place by a number of mechanisms that include straining flocculation sedimentation and surface capture. 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. Times new roman arial arial narrow wingdings arial black verdana generic 1 generic microsoft photo editor 3 0 photo filtration slide 2 slide 3 slide 4 slide 5 filtration mechanisms slide 7 slide 8 slide 9 slide 10 slide 11 slide 12 slide 13 diagrammatic layout of sand filters typical multimedia filter slide 16 slide 17 slide 18 slide 19 slide. Straining or deposition within the media i e.

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. Water softeners a water softener is a device that reduces the hardness of the water. The top of the filter. A water softener typically uses sodium or potassium ions to replace calcium and magnesium ions the ions that create hardness.

In filters with a control valve installed on the filter effluent pipe the filter flow is restricted during this time. Filtration is a process that removes particles from suspension in water. Ultrafiltration uf is a variety of membrane filtration in which forces like pressure or concentration gradients lead to a separation through a semipermeable membrane. 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. When the filtration is started after being backwashed there will be little head loss. 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.