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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
The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal drinking water facilities as part of a multiple-stage treatment system. [1]
It draws raw water from two of the city's water cribs far offshore in Lake Michigan and supplies two thirds of City of Chicago consumers in the northern, downtown, and western parts of the city and to many northern and western surrounding suburbs. The plant was constructed in the 1960s and began functioning in 1968. [1]
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 ...
A licensed environmental engineer and consultant to water utilities, she advocates for introducing water reuse to Illinois’ management of wastewater and stormwater, as most U.S. states already do.
Alluvial soils may also be used to purify waste-water being returned to a river after use. Treated wastewater is typically discharged into a percolation pond on the alluvial flood plain rather than flowing directly into the river. [4] Chemical filtration will cease when all reactive sites within the flow pathway through aquifer soil have reacted.
In 1919, the Board of Commissioners passed an ordinance committing the MWRD to construct and operate sewage treatment plants to protect and preserve Lake Michigan, the source of drinking water for six million people living in Chicago, Cook County communities, and neighboring counties.
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