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RECORD NUMBER: 112 OF 217

OLS Field Name OLS Field Data
Main Title Nitrification and Denitrification of Waste Water.
Author Johnso, Walter K. ; Vani, George B. ;
CORP Author Minnesota Univ., Minneapolis. Sanitary Engineering Div.
Year Published 1971
Report Number Sanitary Engineering-175-S; FWQA-WP-01028; FWQA-17010-FMX; 11792,; 17010-FMX-01/71
Stock Number PB-202 350
Additional Subjects ( Chemical removal(Sewage treatment) ; Nitrates) ; ( Sewage treatment ; Denitration) ; ( Nitrification ; Sewage treatment) ; ( Activated sludge treatment ; Denitration) ; Aeration ; Biochemical oxygen demand ; Flow rate ; Process control ; Kinetics ; Tests ; Metabolism ; Carbon ; Water pollution control
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NTIS  PB-202 350 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 171p
Abstract The report discusses denitrification of waste water. The denitrification was accomplished by continuous flow reactor, a gravity solids-liquid separator, and sludge recycle. A portion of the raw waste-water was added as an external carbon source. By operating two completely mixed biological reactors in series it was possible to accomplish both nitrification and denitrification. Aeration times of 7-9 hours were used to produce a completely nitrified effluent at temperatures as low as 10-12C. Denitrification was accomplished with a 1.3 hour mean reaction tank detention time at 20C and in 2.6 hours at 10C. Effluent ammonia nitrogen was that amount which was added to provide a carbon source. Therefore, addition of wastes with little or no ammonia nitrogen as a carbon source would produce an effluent nearly devoid of ammonia nitrogen. The BOD to nitrogen ratio was shown to be the critical parameter, inasmuch as high ratios would produce a high effluent carbon content, and low ratios resulted in complete denitrification. Keeping the ratio constant resulted in an effluent nitrogen concentration well below 1.0 mg/1. By this same analysis, the rate of nitrate reduction was shown to be a linear function of the sludge loading rate. (WRSIC abstract)
NTIS Title Notes Final rept..
PUB Date Free Form 1 Jan 71,
Category Codes 13B; 68D
NTIS Prices PC A08 MF A01
Document Type NT
Cataloging Source NTIS/MT
Control Number 326520607
Origin NTIS
Type CAT