slow sand filter

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slow sand filter

[′slō ′sand ‚fil·tər]
(civil engineering)
A bed of fine sand 20-48 inches (151-122 centimeters) deep through which water, being made suitable for human consumption and other purposes, is passed at a fairly low rate, 2,500,000 to 10,000,000 gallons per acre (23,000 to 94,000 cubic meters per hectare); an underdrain system of graded gravel and perforated pipes carries the water from the filters to the point of discharge.
References in periodicals archive ?
Tenders are invited for rejuvenation of 5 nos slow sand filters at head works bhadra urban under div nohar.
The complete purification process typically includes physical processes such as filtration, sedimentation, and distillation, biological processes such as slow sand filters or biologically active carbon, chemical processes such as flocculation and chlorination and the use of electromagnetic radiation such as ultraviolet light.
Water treatment plants (rapid and slow sand filters) in Pakistan are not designed to remove pesticides.
The water is then treated using CoCoDAFF and passes through post-ozone and granular activated carbon (GAC) contactors, as well as slow sand filters before arriving at the disinfection stage, where sodium hypochlorite is introduced to contact tanks in doses using 520 series Watson-Marlow pumps.
Water filtration practices; including slow sand filters and precoat filtration.
Slow Sand Filters. This system, introduced into the U.S.
Tenders are invited for Rejuvenation of 1 nos slow sand filters at head works jogiwala feeded from urban water supply scheme bhadra.
These are rapid sand and slow sand filters using granular media and diatomaceous earth filters using a powder-like media.
Tenders are invited for Disilting of Inlet Channel, Chambers and Scraping of Slow Sand Filters at different water supply schemes of Sub Division Sadulshahar.
Despite low filtration rates and long empty-bed contact times (EBCTs), conventional slow sand filters have achieved limited removals of organic precursor material, with dissolved organic carbon (DOC) and trihalomethane formation potential (THMFP) reductions averaging less than 15 to 25 percent.
Replacement of filter media in slow sand filters at mukthinuthalapadu in ongole municipal corporation
Tenders are invited for supply and fixing of filter media in newly made slow sand filters in various water supply scheme in sub dn.