The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 1999
Filed:
Aug. 29, 1997
Mark A Reinsel, Helena, MT (US);
Maxwell K Botz, Clancy, MT (US);
Hydrometrics, Inc., Helena, MT (US);
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.