Sand Filters
Devices that remove some suspended solids from sewage. Air and bacteria decompose additional wastes filtering through the sand so that cleaner water drains from the bed.
Sanitary Landfill ...
sand filters, biological Contactors that remove some suspended solids from wastewater. Air and bacteria decompose organic matter filtering through the sand so that cleaner water is collected as filtrate.
Where sufficient land and space are available, water may be treated in slow sand filters. These rely on biological treatment processes for their action rather than physical filtration.
The process which remove pollutants not adequately removed by secondary treatment, particularly nitrogen and phosphorus; accomplished by means of sand filters, microstraining, or other methods. Similar to tertiary treatment.
Definition source ...
The filtration medium consists of a multiple layer of sand with a variety in size and specific gravity. Sand filters can be supplied in different sizes and materials both hand operated and fully automatically.
 See also: Environment, Treatment, Water, Waste, Pollutant
  
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