Kinetic Model for Biological Nitrogen Removal Using Shortcut Nitrification-Denitrification Process in Sequencing Batch Reactor

Abstract

A kinetic model for shortcut nitrification-denitrification process with sequencing batch reactor (SBR) was developed. To test this model, the kinetic parameters of the model including maximum specific rates and half-maximum rate concentrations for shortcut nitrification and denitrification were estimated from the results obtained from a laboratory-scale SBR fed with a soybean curd processing wastewater (400-800 mg COD L(-1), 50-65 mg NH(4)(+)-N L(-1)) at 26 degrees C. In the nitrification step, two DO levels (0.5 and 3.5 mg L(-1)) were tested and the predicated nitrification rates under different NH(4)(+)-N concentrations using this model fit well with correlation coefficient R = 0.9902. In the denitrification step, the process of nitrite removal was close to a zero-order reaction if the concentration of electron donor was not so low (COD > 100 mg L(-1)), and concentrations of nitrite and organic matter (as COD) had limited effect on denitrification rate. The model can be used to predict nitrogen removal performance with different influent NH(4)(+)-N and COD concentrations and under various DO concentrations.

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

“…2, showing the DO and pH evolution with nitrogen dynamics. The results indicate that evolution of DO and pH is consistent with the normal regulation during nitrification and denitrification (Gao et al 2010). Furthermore, incomplete nitrification to nitrite is independent of influent ammonia loadings and operation time.…”

“…Since short-cut nitrification occurred in this study, specific growth rate of AOB (l A ) (day -1 ) can be estimated by Eq. (4) (Gao et al 2010). In this equation, Y A (g VSS/ g COD) is the yield coefficient of AOB.…”

“…The constant A is obtained by fitting the results by the Eq. (5) (Gao et al 2010). The principle of least-squares method was used to fit the cycle data and to obtain A and C (R 2 [98 %).…”

Simultaneous ammonia and nitrate removal in an airlift reactor using poly(butylene succinate) as carbon source and biofilm carrier

“…4 (Panel C). These results demonstrated that denitrification obeyed zero-order kinetics under both anoxic and aerobic/anoxic operating conditions which was corresponding to denitrification process in a biological nitrogen removal SBR (Gao et al, 2010). The denitrification rates of intermittent aeration and anoxic groups were 0.49 kg m À3 d À1 and 0.37 kg m À3 d À1 , respectively.…”

ASM3 extended for two‐step nitrification–denitrification: a model reduction for sequencing batch reactors

“…Different models have been developed to describe NBND. 3,4 The ASM3 extended for two-step nitrification-denitrification 5 (referred in this work as 'extended ASM3') represents the most accurate model for the description of the ASP with NBND. This model describes the dynamics of the activated sludge with high accuracy and has been developed based on a strong physiological and biochemical basis, which make it an ideal tool for process understanding and 12 includes the quantification of energy storage in order to describe ready biodegradable substrate and oxygen uptake with higher accuracy.…”