Other

USA As Represented by Secretary of the Navy

Fume-klean

Henry P Sheng

Bingham Y Pan

Martin E Tellkamp

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.

Treatment of sodium nitrite-containing boiler wastewater

An apparatus for neutralizing basic fumes and acidic fumes and absorbing such fumes and the salts thereof in a liquid solvent comprising a vertically extending, columnar housing; a cylindrical gas flow passage at the bottom of the housing in inwardly spaced relationship therefrom; a tangential gas inlet connected to the inlet of the cylindrical gas flow passage extending through the housing and sealed from direct communication therewith; a conical, upwardly converging gas flow passage the inlet of which is connected in gas tight sealing relationship to the top and outlet of the cylindrical gas flow passage; downwardly directed liquid solvent spraying apparatus disposed in the housing above the outlet of the conical passage and directed downwardly along the projection of the axis of the conical passage; first coalescing apparatus disposed in the housing at a first elevation above the spraying apparatus and extending radially across the housing and abutting the entire circumference thereof at the first elevation, for receiving a gaseous stream with an entrained liquid solvent from the lower part of the housing and for coalescing such liquid solvent; absorption apparatus disposed in the housing at a second elevation above the first coalescing apparatus and extending radially across the housing and abutting the entire circumference thereof at the second elevation, for receiving a gaseous stream containing basic and acidic fumes from the first coalescing apparatus and for absorbing, when suitably wetted with a liquid solvent, such basic and acidic fumes.

Apparatus for neutralizing and removing fumes

A phase separation apparatus is provided for effecting phase separation of two immiscible liquids. The apparatus comprises an inner rotatable tube the bottom end of which is charged axially with the two liquids, and an outer tube which forms an outer chamber surrounding the inner tube. The inner tube includes a plurality of slots or openings along the length thereof and when the inner tube is rotated the heavier phase liquid will be separated from the lighter phase and will exit through the slots in the inner tube into the outer chamber for collection. The lighter phase is collected at the top of the inner tube.

Growing community of inventors

Claremont, CA, United States of America

Henry P Sheng