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Updated: May 23, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
Published on: December 6, 2018
[Control for MUCT process operation using nitrate concentration in the secondary anoxic zone]
Xiao-Ling Wang1, Jun Yin, Shang Gao
1School of Municipal and Environmental Engineering, Jilin Architectural and Civil Engineering Institute, Changchun 130021, China. smile_gyb@sina.com
Abstract:
The feasibility of the control for MUCT process operation using nitrate concentration in the secondary anoxic zone were investigated by using simulative domestic sewage, in which the influent chemical oxygen demand concentration was stabilized at (290 +/- 10) mg x L(-1), the influent total nitrogen (TN) concentration was stabilized at (55 +/- 0.5) mg x L(-1), the influent total phosphorus (TP) concentration was stabilized at (7.0 +/- 0.5) mg x L(-1). The nitrate concentration in the secondary anoxic zone was changed to compare the effluent total nitrogen and total phosphorus concentration. The results indicated that, effluent total nitrogen and total phosphorus concentration significantly were affected by S(NO3-), controlling nitrate recirculation flow keeping SNO3- in 2.5 mg x L(-1) can realize MUCT process as the optimal control for nitrogen and phosphorus removal. The TP and NO3(-) -N mass balances were performed around each zone and settling tank based on the averaged TP and TN concentrations for each nitrate concentration in the secondary anoxic zone, which was indicated that S(NO3-) is a key factor determining the mass of phosphorus which is released in anaerobic zone, mass of phosphorus uptake in the secondary anoxic zone, and mass of NO3(-) -N which is denitrified in the first and secondary anoxic zone.
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