Method for eliminating ammonia nitrogen from sewage

Details Method for eliminating ammonia nitrogen from sewage Method for eliminating ammonia nitrogen from sewage

1980-02-06

1981-09-22

Cintins, Ivars C.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210903, C02F 128

Patent

active

042908957

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.

REFERENCES:
patent: 3475330 (1969-10-01), Gilles
patent: 3723308 (1973-03-01), Breck
patent: 3842000 (1974-10-01), Dawson
patent: 3948769 (1976-04-01), Dobbs
patent: 4098690 (1978-07-01), Semmens
patent: 4130484 (1978-12-01), Marwil et al.
"A Critical Review of Current Municipal Wastewater Treatment Technology," Pacific Northwest Labs Publication, (Jul.) 1973, pp. 1-9, 41-50 and 63-67.
Plank, C. J., "The Adsorption of Ions from Buffer Solutions by Silica, Alumina and Silica-Alumina Gels," J. Phys. Chem., vol. 57, (Mar.) 1953, pp. 284-290.

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