Research Article
Aug 1975
Optimization of Denitrification Process
Publication: Journal of the Environmental Engineering Division
Volume 101, Issue 4
Abstract
A denitrification system composed of a completely stirred tank reactor (CSTR) followed in series with a plug flow reactor (PFR) was tested in order to minimize the disadvantages of each process when used separately. High efficiency of NO3-N removal and good process control can be achieved with the series treatment system using 25% of the volume required with a single CSTR reactor. Most influent NO3-N concentrations were greater than 1000 mg/l, and these usually result in effluent concentrations less than 50 mg/l. The effluent NO3-N concentration was reduced to less than 0.5 mg/l with a total hydraulic detention time of 1.7 hr when the influent NO3-N concentration was 80 mg/l. Design conditions which would minimize treatment volume requirements would include microbial mass loadings (g NO3-N g VSS/ day in the CSTR and PFR of 2.0 day-¹, and 0.2 day-¹, respectively, resulting in a 40% removal efficiency in the CSTR reactor and greater than 95% NO3-N removal efficiency in the total system. The microbial yield averaged 0.11 g VSS synthesized per g of COD removed.
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Published In
Journal of the Environmental Engineering Division
Volume 101 • Issue 4 • August 1975
Pages: 643 - 657
Copyright
© 1975 American Society of Civil Engineers.
History
Published in print: Aug 1975
Published online: Feb 11, 2021
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Authors
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Richard P. Michael
Research Asst., Dept. of Civ. Engrg., Univ. of Vermont, Burlington, Vt.; also with Dufresne and Henry Consulting Engrs., Inc., North Springfield, Vt.
William J. Jewell, M.ASCE
Assoc. Prof., Cornell Univ., Ithaca, N.Y.
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