Pressure Sand Filters

Additional Details

Pressure Sand Filters ( Multigrade Sand Filters )

These filters are the most popular method for removal of turbidity from water. The pressure sand filter consists  of a multiple layer of sand with a variety in size and specific gravity. These filters are designed  to remove  turbidity and suspended particles present in the feed water with minimum pressure he drop. These Filters are custom designed to suit the process requirement. These filters are offered in Mild Steel. FRP or SS construction with face piping and associated Valves.

Construction

The Pressure sand filter consists of a pressure vessel either vertical or horizontal, with a set of frontal pipe work and valves graded silica quarts sand supported by layers of graded under bed consisting of babbles and gravels, a top distributor to distribute the incoming water uniformly thought the cross section of the filter  and an under drain system to uniformly collect the filtered water.

Process

Raw water flows down wards through the filter bed and as the suspended matter. Which is treated by addition of a coagulant like alum or poly electrolyte, is retained on the sand surface and between the sand grains immediately below the surface. These is steady rice in the loss of head over  a period of time and the flow reduces once the pressure drop across the filter is excessive.

The filter is then taken out of service and cleaning of the filter media is effected by flow reversal also called as backwash. To assist in cleaning the bed, the backwash operation is sometimes preceded by air scouring by way of agitation through the under drain system. The air scouring agitates the sand with a scrubbing action , which loosens the intercepted particles. The filter is now ready to be put back into service.

Salient Features:

Efficient Turbidity Removal                      

MOC –FRP ,MSRL,MSEP &SS

Standard and effective multi grade sand media

Low pressure drop across the vessel

Optional Air scouring available

Manual Semi Automatic & Automatic Options.