Thermochemical nitrate destruction

Patent · Tue Jun 02 00:00:00 EDT 1992

OSTI ID:7073164

Cox, J L; Hallen, R T; Lilga, M A

A method is disclosed for denitrification of nitrates and nitrites 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 C to about 600 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.

• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Inst., Richland, WA (United States)
• Patent Number(s): A; US 5118447
• Application Number: PPN: US 7-684717
• OSTI ID: 7073164
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
CHEMICAL REACTIONS
DENITRIFICATION
HYDROGEN COMPOUNDS
LIQUID WASTES
NITRATES
NITRITES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
REMOVAL
WASTE WATER
WASTES
WATER
WATER TREATMENT