Process for continuous removal of ammoniacal nitrogen from aqueo

Details Process for continuous removal of ammoniacal nitrogen from aqueo Process for continuous removal of ammoniacal nitrogen from aqueo

1984-10-22

1985-06-11

Wyse, Thomas

Liquid purification or separation

Processes

Ion exchange or selective sorption

210676, 210681, 210903, 502 47, C02F 142, B01J 2938

Patent

active

045227276

ABSTRACT:
A continuous process for removal of ammoniacal nitrogen from water is disclosed. This process is useful for maintaining water quality in aquaculture operations, e.g., fish hatcheries and the like. A particulate stream of zeolitic ion exchange material is circulated continuously through an exchanger and a regenerator. An aqueous process stream containing ammoniacal nitrogen, e.g., ammonia, is passed through the exchanger in continuous counter current liquid-solid contact with a stream of particulate, ammoniacal nitrogen-sorbing zeolitic ion exchange material of natural or synthetic origin. A treated liquid water stream having a reduced ammoniacal nitrogen content exits from the exchanger, as does a stream of ammoniacal nitrogen-enriched particulate zeolitic ion exchange material. The latter stream is regenerated in the regenerator at a temperature of about 350.degree. C. to about 650.degree. C. while an oxygen-containing gas stream, e.g., air, is passed in continuous counter current gas-solid contact therewith. Gases emanating from the regenerator are used to preheat the ammoniacal-nitrogen enriched particulate material that enters the regenerator. The regenerated stream of particulate, ammoniacal nitrogen-sorbing zeolitic ion exchange material is recycled to the exchanger.

REFERENCES:
patent: 3723308 (1973-03-01), Breck
patent: 3929600 (1975-12-01), Hiasa et al.
patent: 3948769 (1976-04-01), Dobbs
patent: 3984313 (1976-10-01), Higgins
patent: 4219441 (1980-08-01), Noshimura et al.
patent: 4344851 (1982-08-01), Sherman et al.

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