Thermochemical nitrate destruction

Patent · 31 December 1991

OSTI ID:868323

Cox, John L ^[1]; Hallen, Richard T ^[1]; Lilga, Michael A ^[1]

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1. Richland, WA

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, MA)
• Patent Number(s): US 5118447
• OSTI ID: 868323
• Country of Publication: United States
• Language: English

Related Subjects

/210/588/
200
600
accumulating
aqueous
aqueous waste
below
carbon
carbon dioxide
causing
comprises
concentration
concentration nitrate
conditions
degree
denitrification
destruction
dioxide
dioxide gas
disclosed
drinking
formate
gas
heated
heating
holding
hydroxides
identifying
level
method
method comprise
method comprises
mixture
nitrate
nitrates
nitrites
nitrogen
oxide gas
predetermined
pressurized
products
reaction
reaction temperature
reducing
residence
residence time
resulting
standards
steps
stream
streams
temperature
thermochemical
time
waste
waste stream
waste streams
water