Process for the purification of aqueous solutions polluted by ni

Details Process for the purification of aqueous solutions polluted by ni Process for the purification of aqueous solutions polluted by ni

1993-04-26

1993-11-30

McCarthy, Neil M.

Liquid purification or separation

Processes

Treatment by living organism

210631, 210714, 210724, 210726, 210730, 210734, 210903, 210916, 210917, 423119, 423125, 423397, 71 58, C02F 300, C02F 158

Patent

active

052662012

ABSTRACT:
The invention relates to a process for the purification of aqueous solutions polluted by nitrate ions. This process is characterised in that it consists in precipitating hydrated double or mixed calcium nitroaluminates, such as, in particular, hydrated calcium mononitroaluminate, by adding at least one agent supplying the element aluminium and at least one agent supplying the element calcium to the solutions to be treated, the overall mole ratio of the element aluminium to nitrate, Al/NO3, being superior to 1 and the overall mole ratio of calcium to nitrate, Ca/NO3, being superior to 2, and in that the precipitation reaction is performed with stirring and at a basic pH, preferably above 10.5.
The process according to the invention is intende, in particular, to the treatment of polluted waters such as municipal waste water and factory effluents and to the treatment of liquid manure.

REFERENCES:
patent: 3617579 (1971-11-01), Gunderloy, Jr. et al.
patent: 4045341 (1977-08-01), Tsuruta et al.
patent: 4267057 (1981-05-01), Hager et al.
patent: 4268397 (1981-05-01), Horie et al.
Chemical Abstracts, vol. 91, No. 26, abstract No. 221583, Dec. 24, 1979.
Chemical Abstracts, vol. 111, No. 26, abstract No. 238985, Dec. 25, 1989.

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