Sand filter

From Simple English Wikipedia, the free encyclopedia

A sand filter is a layer of sand which is used to clean water of bacteria and other microorganisms.[1] It is a type of filter.[2]

A layer of sand or gravel is used when sewage goes through sewage treatment.[1] Before sewage comes to the bacteria bed, it should already have gone thru part of the sewage treatment.[3] At the bacteria bed, sewage gets exposed to (or has contact with) air, while microorganisms make some change to that sewage.[1] The oxygen in the water kills the microbes, which are anaerobic.

The name "bacteria bed" is sometimes used about this type of filter.

References[change | change source]

  1. 1.0 1.1 1.2 "Definition of bacteria bed". The Free Dictionary. Retrieved 2007-07-26.
  2. "Slow Sand Filtration" (PDF). National Drinking Water Clearinghouse. Archived from the original (PDF) on 2019-07-13. Retrieved 2021-07-05.
  3. A. Rushton, A.S. Ward, R.G. Holdich 1996. Introduction to solid-liquid filtration and separation technology. Wiley VCH. ISBN 978-3-527-28613-3