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 NO 3 -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 NO 3 -N concentrations were greater than 1000 mg/l, and these usually result in effluent concentrations less than 50 mg/l. The effluent NO 3 -N concentration was reduced to less than 0.5 mg/l with a total hydraulic detention time of 1.7 hr when the influent NO 3 -N concentration was 80 mg/l. Design conditions which would minimize treatment volume requirements would include microbial mass loadings (g NO 3 -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% NO 3 -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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