Process for complete removal of nitrites and nitrates from an aq

Details Process for complete removal of nitrites and nitrates from an aq Process for complete removal of nitrites and nitrates from an aq

1989-10-13

1990-09-11

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204102, 204128, 204129, 204130, 423235, 423242, 423385, 423239, 210903, C25B 100

Patent

active

049560573

ABSTRACT:
A process for complete removal of nitrites and nitrates from an aqueous solution (1) by means of electrolysis, wherein the aqueous solution (1) is fed to the cathode space (4) of an electrolysis cell (2) and an aqueous solution (10), still containing only non-participating residual salts, is discharged from the anode space (6), whereas the gas (7) formed at the cathode is fed to a catalyst bed (8). In the latter, the gases H.sub.2, NH.sub.3, NO and N.sub.2 O collected in the cathode space (4) are converted to the non-toxic substances N.sub.2 and H.sub.2 O. In addition, partial combustion of H.sub.2 by O.sub.2 from the anode space (6) for maintaining the temperature of the catalyst bed (8).

REFERENCES:
patent: 3994790 (1976-11-01), Inoue
patent: 4312722 (1982-01-01), Yoshida
patent: 4397719 (1983-08-01), Yoshida
patent: 4427503 (1984-01-01), Heilgeist
patent: 4571329 (1986-02-01), Kato et al.

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