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A biosand filter (BSF) is a point-of-use water treatment system adapted from traditional slow sand filters. Biosand filters remove pathogens and suspended solids from water using biological and physical processes that take place in a sand column covered with a biofilm .
Sand filter used for water treatment. Sand filters are used as a step in the water treatment process of water purification. There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world.
As water passes through the hypogeal layer, particles of foreign matter are trapped in the mucilaginous matrix and soluble organic material is adsorbed. The contaminants are metabolised by the bacteria, fungi and protozoa. The water produced from an exemplary slow sand filter is of excellent quality with 90–99% bacterial cell count reduction ...
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The District of Columbia government is considering redevelopment plans for the McMillan Sand Filtration Site which is no longer used for water treatment. McMillan Sand Filtration Site is a twenty-five acre decommissioned water treatment plant in northwest Washington, D.C. , built as part of the historic McMillan Reservoir Park.
Together the two plants supply water to about 3 million households in the city and 118 suburbs. [ 3 ] Filtration methods used by the Jardine Water Plant is extraction and adding chemical additives; with the use of sand and gravel to filter the water, while the chemical additives being fluoride to fight off tooth decay, phosphates to avoid ...
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