Compositions – Radioactive compositions
Patent
1991-04-12
1992-06-02
Hunt, Brooks H.
Compositions
Radioactive compositions
210761, 210758, 210903, 423DIG20, G21F 900, C02F 172
Patent
active
051184478
ABSTRACT:
A method is disclosed for denitrification of nitrates and nitrates present in aqueous waste streams. The method comprises the steps of (1) identifying the concentration nitrates and nitrites present in a waste stream, (2) causing formate to be present in the waste stream, (3) heating the mixture to a predetermined reaction temperature from about 200.degree. C. to about 600.degree. C., and (4) holding the mixture and accumulating products at heated and pressurized conditions for a residence time, thereby resulting in nitrogen and carbon dioxide gas, and hydroxides, and reducing the level of nitrates and nitrites to below drinking water standards.
REFERENCES:
patent: 3962114 (1976-06-01), Berreth
patent: 4968436 (1990-11-01), Gutekunst et al.
Meile, LJ; Johnson, AJ; 1983. "Waste Generation Reduction--Nitrates FY 1983 Status Report", RFP-3619, UC-70 Nuclear Waste Management, DOE/TIC-4500 (Rev. 72).
Meile, LJ; Johnson, AJ; 1982. "Waste Generation Reduction--Nitrates FY 1982 Status Report", RFP-3465, UC-70 Nuclear Waste Management, DOE/TIC-4500 (Rev. 72).
Gunderloy, FC, Jr.; Fujikawa, CY; Dyan, VH; Grid, S; 1968. "Dilute Solution Reactions of the Nitrate Ion as Applied to Water Reclamation", Report No. TWRL-1.
Gunderloy, FC, Jr.; Wagner, RI; Dyan, VH; 1970. "Development of a Chemical Denitrificatoin Process", EPA 17010 EEX/70.
Merz, ER. Overview on the Application of Denitration in the Nuclear Field, Denitration of Radioactive Liquid Waste, 1986.
Cecille, L.; Kelm, M., Chemical Reactions Involved in the Denitration Process with HCOOH and HCHO, Denitration of Radioactive Liquid Waste, 1986.
Kelm, M.; Oser, B., Drobnik, S. Denitration of Reprocessing Concentrate by means of HCOOH, Denitration of Radioactive Liquid Waste, 1986.
Cox John L.
Hallen Richard T.
Lilga Michael A.
Battelle (Memorial Institute)
Hunt Brooks H.
Mai Ngochan T.
Zimmerman Paul W.
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