SAND FILTERS
Description
Depending on the type of water, suspended solids concentration, oil and grease, COD/ BOD, iron contents, sand filters are sized differently, but the basic design data to clarify natural waters are the following:
Filtration velocity; 6-15 m3/h.m2
Diameter; 50 cm to 1m 1 to 3m
Filtration area; 0,2 to 0,8 m2 0,8 to 7 m2
Flow rates; 10L/h to 10 m3/h 10 to 100 m3/h
Pressure ratings ; 4 to10 bar
Vessel Materials; Epoxy-coated steel, Polyester composite, Stainless steel (on request)
Bed depth; 1 meter min.
Filtration media Anthracite; 1.4-1.5 mm
Sand 0.4-0.8 mm
Sand 1.0-2.0 mm
Gravel 2.0-3.15 mm
Gravel 3.15-5.6 mm
Top manhole; 2 1/2 to 6"DN 400
Accessories; 5-ball or butterfly valves 5-butterfly valves
Options ; Manometers, degaser, flowmeter
Control Automatic or manual backwash, on timer and/or differential pressure