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US 4,290,895 AGranted
Method for eliminating ammonia nitrogen from sewage
OwnerTsuneo Iwamotoinventor
Life of this patent
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Abstract
Sewage contains much nitrogen as ammonium ions. The inventor has discovered that silica gel adsorbs ammonia very well under a high pH range. Silica gel is conditioned by an alkali solution and is packed in an adsorption vessel. The pH of sewage is also adjusted by adding alkali solution. The alkali-conditioned sewage is passed through the adsorption vessel. The ammonia molecules in the sewage are then adsorbed by the silica gel.
Claims6
A method for eliminating ammonia nitrogen from sewage comprising the steps of:
- adding alkali to sewage to convert ammonium ions to dissolved ammonia;
- and,
- contacting the alkali-treated sewage with alkali-conditioned silica gel to adsorb said dissolved ammonia onto said alkali-conditioned silica gel.
Dependencies are inferred from the claim text.