Liquid purification or separation – Processes – Treatment by living organism
Patent
1978-10-10
1982-02-16
Hruskoci, Peter A.
Liquid purification or separation
Processes
Treatment by living organism
210623, 210624, 210903, C02F 330
Patent
active
043158218
ABSTRACT:
An improved process is disclosed for the treatment of aqueous waste streams containing nitrogenous matter (nitrate or nitrite ions or matter capable of forming nitrate and nitrite ions) in the presence of sufficient carbonaceous matter to permit substantially complete denitrification of the aqueous effluent. The process comprises introducing an aqueous waste stream having a pH less than 6 into an anaerobic treatment zone containing anaerobic activated sludge at a rate such that the concentrations of nitrate and nitrite ions in the anaerobic treatment zone are maintained at a level less than 3 milligrams/liter. In embodiments, the effluent from the anaerobic treatment zone is passed to an aerobic treatment zone effluent from which is recycled at a rate at least equal to that at which untreated waste is fed to the anaerobic treatment zone. The waste stream feed may contain phenol.
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patent: 3654147 (1972-04-01), Levin et al.
patent: 3817857 (1974-06-01), Torpey
patent: 3953327 (1976-04-01), Parker
patent: 3964998 (1976-06-01), Barnard
Johnson et al., "Nitrogen Removal by Nitrification & Denitrification", WPCFJ, pp. 1015-1036, 8/1964.
Babbit et al., Sewerage & Sewage Treatment, pp. 661-662.
St. Amant et al., "Treatment of High Nitrate Waters", JAWWA, 12/1969, pp. 659-662.
Lvdzack et al., "Controlling Operation to Minimize Activated Sludge Effluent Nitrogen", WPCFJ, 9/1962, pp. 920-931.
Du Pont Canada Inc.
Hruskoci Peter A.
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