Liquid purification or separation – Processes – Chemical treatment
Patent
1995-10-27
1997-06-24
McCarthy, Neil
Liquid purification or separation
Processes
Chemical treatment
210762, 210763, C02F 172
Patent
active
056414137
ABSTRACT:
A process for treating wastewaters containing carbonaceous COD and at least one nitrogen-containing compound is disclosed comprising wet oxidizing the wastewater with an oxidizing agent at a temperature less than 373.degree. C. and a pressure sufficient to maintain a liquid water phase, to produce an oxidized wastewater containing a reduced concentration of COD. The nitrogen of the nitrogen-containing compound is substantially converted to ammonia, nitrate and nitrite. Sufficient inorganic nitrogen-containing compound is added to the oxidized wastewater to produce essentially equal concentrations of ammonia-nitrogen and nitrite-nitrogen plus nitrate-nitrogen. Mineral acid is added to the oxidized wastewater to produce a pH between 4 and 7, and optionally, a transition metal salt is added, to catalyze a thermal denitrification step. The wastewater is heated at temperatures between about 100.degree. C. and 300.degree. C. to decompose the nitrogen compounds, producing a purified wastewater.
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patent: 5221486 (1993-06-01), Fassbender
Leavitt, D.D. et al., "Homogeneously Catalyzed Oxidation for the Destruction of Aqueous Organic Wastes", Environmental Progress (vol. 9, No. 4), pp. 222-228; Nov. 1990.
Leavitt, D.D. et al., "Acid-Catalyzed Oxidation of 2, 4-Dichlorophenoxyacetic Acid by Ammonium Nitrate in Aqueous Solution.,"Environ. Sci. Tech., 1990, 24, 566-571.
Copa William M.
Momont Joseph A.
McCarthy Neil
Randall Tipton L.
Zimpro Environmental Inc.
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