Treatment of sodium nitrite-containing boiler wastewater

Details Treatment of sodium nitrite-containing boiler wastewater Treatment of sodium nitrite-containing boiler wastewater

1991-11-12

1993-01-05

Nelson, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210719, 210750, 210757, 210903, 210912, C02F 152, C02F 168

Patent

active

H00011266

ABSTRACT:
An integrated process for treatment of wastewater from steam boiler clean operations, containing sodium nitrite and also usually heavy metal ions such as Cu, Fe, Pb, Cr, Cd, Zn and Ni, as well as suspended solids and sludge, to remove the nitrite, substantially reduce the amount of such metal ions and remove suspended solids and sludge in the treated wastewater. The process comprises adding sulfamic acid to the wastewater, particularly in about stoichiometric proportions with respect to sodium nitrite to form gaseous nitrogen. The reaction takes place at ambient temperature and atmospheric pressure. An alkali such as sodium hydroxide is added to the resulting solution in amount sufficient to raise the pH thereof to about 10, and precipitating the metal ions. The precipitates and suspended solids and sludge are removed from the resulting wastewater by settling and filtration, and the wastewater free of nitrite and of substantially reduced metal ion content and free of suspended solids as well as sludge, is in condition for discharge to sewers.

REFERENCES:
patent: 3617579 (1971-11-01), Gunderloy, Jr.
patent: 3709364 (1973-01-01), Savage
patent: 3862296 (1975-01-01), Dotson et al.
patent: 3962114 (1976-06-01), Berreth
patent: 4990266 (1991-02-01), Vorlop et al.

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