Inexpensive purification of urea waste streams

Details Inexpensive purification of urea waste streams Inexpensive purification of urea waste streams

C - Chemistry, Metallurgy

02

F

362/31

C02F 9/00 (2006.01) C02F 1/66 (2006.01) C02F 1/72 (2006.01)

Patent

CA 1046665

INEXPENSIVE PURIFICATION OF UREA WASTE STREAMS ABSTRACT OF THE DISCLOSURE Urea is destroyed in aqueous waste streams containing various anions and cations plus urea by contacting the stream with a cation exchange resin, then reacting the resulting stream with nitric oxide, nitrous acid or a nitrite salt to convert the urea to nitrogen, carbon dioxide and water and treating the resulting stream with an anion exchange resin. A pure aqueous stream is obtained which does not adversely affect the environment and which may be recycled to a plant as fresh water resulting in large monetary savings in fresh water cost.

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