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The supernatant water is then run back into the treatment process or disposed of as a waste-water stream. In some countries, the sludge may be used as a soil conditioner. Inadequate filter maintenance has been the cause of occasional drinking water contamination. Sand filters are occasionally used in the sewage treatment as a
Since media other than silica sand can be used in such filters, a more modern term is "rapid filtration" instead of "rapid sand filtration." [5] [6] The unfiltered water flows at about 5 m/h, through the filter medium under gravity or under pumped pressure and the floc material is trapped in the sand matrix. [7] [8]
As a water conservation measure, many water purification plants recycle filter backwash water and other product streams from sludge treatment processes back to the beginning of the plant. [ 4 ] : 22.40–22.43 [ 5 ] : 242–3 On June 8, 2001, the USEPA released a final regulation governing acceptable practices for recycling backwash water. [ 10 ]
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Slow sand filters are recognized by the World Health Organization, [15] Oxfam, [16] and the United States Environmental Protection Agency [17] as being a superior technology for the treatment of surface water sources in small water systems. According to the World Health Organization, "Under suitable circumstances, slow sand filtration may be ...
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