Biological filter for oxidizing ammonia in drinking water...

Details Biological filter for oxidizing ammonia in drinking water... Biological filter for oxidizing ammonia in drinking water...

2009-06-01

2011-10-04

Upton, Christopher (Department: 1778)

Liquid purification or separation

Processes

Treatment by living organism

C210S620000, C210S903000

Reexamination Certificate

active

08029674

ABSTRACT:
A process for treatment of water to convert ammonia to nitrate including: feeding water containing dissolved ammonia, as an influent introducing water to be treated, into a packed column containing filter media as packing; introducing air through a diffuser at the bottom of the packed column to maintain the water saturated with oxygen throughout the packed column; establishing colonies of bacteria converting ammonia to nitrate within the column; and removing an ammonia-free and nitrite-fee effluent from the column.

REFERENCES:
patent: 3773660 (1973-11-01), Hopwood
patent: 4179374 (1979-12-01), Savage et al.
patent: 4696747 (1987-09-01), Verstraete et al.
patent: 4800021 (1989-01-01), Desbos
patent: 5019268 (1991-05-01), Rogalla
patent: 5525230 (1996-06-01), Wrigley et al.
patent: 6159364 (2000-12-01), Hirane
patent: 6413427 (2002-07-01), Tipton et al.
patent: 7022233 (2006-04-01), Chen

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