Anoxic biotreatment cell
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United States of America Patent
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Jun 1, 1999
Grant Date -
N/A
app pub date -
Aug 29, 1997
filing date -
Aug 29, 1997
priority date (Note) -
Expired
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Abstract
A biotreatment cell for removing nitrate from water is provided comprising a closed tank having an inlet port and an outlet port, and containing therein particulate matter which forms a fixed porous bed on which microorganisms form a biofilm. Water travels from the inlet to the outlet thereby passing through the bed. The particulate matter has a density and size sufficient to form a fixed bed during the nitrate removal process and provides a bed having a porosity of about 0.25 to 0.95, preferably about 0.45. The bed material is preferably geochemically stable natural rock crushed to promote a specific size distribution. A method and additive system to maintain the nutrient phosphate level at a controlled effluent concentration are also provided for efficiently removing nitrate from water using the biotreatment cell of the invention.
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