Novel MicroC Mathematical Model for Biological Nitrogen Removal in Activated Sludge Systems: Introduction of the Multi Heterotrophic-biomass Simulation

2013 ◽  
Vol 2013 (16) ◽  
pp. 2347-2365
Author(s):  
Mehran Andalib ◽  
Anthony Giovannone ◽  
John Copp ◽  
Paul Togna ◽  
Samuel Ledwell
Keyword(s):  
Mathematical Model ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Biological Nitrogen Removal ◽  
Biological Nitrogen ◽  
Heterotrophic Biomass ◽  
Activated Sludge Systems

Biological Nitrogen Removal Activated Sludge Process in Warm Climates

2015 ◽  
Vol 7 (0) ◽  
pp. 9781780401904-9781780401904
Author(s):  
C. Y. Shi ◽  
W. Y. Long ◽  
A. C. Meng ◽  
K. S. Raajeevan
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Biological Nitrogen Removal ◽  
Activated Sludge Process ◽  
Biological Nitrogen ◽  
Warm Climates

scholarly journals Optimized biological nitrogen removal of high-strength ammonium wastewater by activated sludge modeling

2017 ◽  
Vol 8 (3) ◽  
pp. 393-403 ◽  
Author(s):  
Abdelsalam Elawwad
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
High Strength ◽  
Simulation Software ◽  
Operating Conditions ◽  
Biological Nitrogen Removal ◽  
Sampling Campaign ◽  
Activated Sludge Modeling ◽  
Biological Nitrogen

Abstract Wastewater containing high ammonium concentrations is produced from various industrial activities. In this study, the author used a complex activated sludge model, improved by utilizing BioWin© (EnviroSim, Hamilton, Canada) simulation software, to gain understanding of the problem of instability in biological nitrogen removal (BNR). Specifically, the study focused on BNR in an industrial wastewater treatment plant that receives high-strength ammonium wastewater. Using the data obtained from a nine-day sampling campaign and routinely measured data, the model was successfully calibrated and validated, with modifications to the sensitive stoichiometric and kinetic parameters. Subsequently, the calibrated model was employed to study various operating conditions in order to optimize the BNR. These operating conditions include alkalinity addition, sludge retention time, and the COD/N ratio. The addition of a stripping step and modifications to the configuration of the aerators are suggested by the author to increase the COD/N ratio and therefore enhance denitrification. It was found that the calibrated model could successfully represent and optimize the treatment of the high-strength ammonium wastewater.

Activated sludge system modelling and simulations for improving the effluent water quality

1999 ◽  
Vol 39 (8) ◽  
pp. 93-98 ◽  
Author(s):  
Chia-Yau Cheng ◽  
Irina Ribarova
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Biological Nitrogen Removal ◽  
System Modelling ◽  
Extended Model ◽  
Conventional Activated Sludge ◽  
Activated Sludge System ◽  
Biological Nitrogen ◽  
Parameter Values

This paper describes the results from a study carried out to investigate the feasibility of upgrading Parada wastewater treatment plant (WWTP) for biological nitrogen removal. The biological treatment of Parada WWTP is a conventional activated sludge process. Since 1992 only one of the three available aeration tanks has been used. Activated Sludge Model No.1 was used as a base for modelling of the activated sludge system. To accomplish all the calculations, AQUASIM software was applied. The model was calibrated and verified with data from Parada WWTP operation. Very good correlations between measured data and simulation results were achieved using stoichiometric and kinetic parameter values proposed by the authors of IAWQ Model No. 1. However, characterisation of the actual wastewater was necessary. Computer simulations with a verified and extended model were done to study whether the capacity of the treatment plant is enough for biological nitrogen removal. Very high effluent quality can be achieved if the first tank volume is used for denitrification, the second and third tank volumes are used for BOD removal and nitrification, the recirculating effluent flow ratio is 1.5 and the sludge age is 15 days.

Differences in nitrification potential between fully aerobic and nitrogen removal activated sludge systems

2002 ◽  
Vol 46 (1-2) ◽  
pp. 297-304
Author(s):  
G.J. Hatziconstantinou ◽  
A. Andreadakis
Keyword(s):  
Activated Sludge ◽  
Decay Rate ◽  
Nitrogen Removal ◽  
Nitrogen Loss ◽  
Performance Evaluations ◽  
Available Nitrogen ◽  
Nitrification Potential ◽  
Autotrophic Biomass ◽  
Heterotrophic Biomass ◽  
Activated Sludge Systems

Experimental observations made on two pilot plants, showed that nitrogen removal activated sludge systems, operating under favourable conditions, seem to develop increased nitrification potential compared to fully aerobic systems under similar conditions. This increased potential, which cannot be detected by simple nitrification performance evaluations, is attributed to higher autotrophic populations sustained – developed in similar systems employing anoxic reactors or phases. A reduced autotrophic decay rate under anoxic conditions as reported by some researchers, seems to play a significant role in such a response, most likely together with a more efficient use of available nitrogen for additional nitrifying microorganisms production, resulting from a reduced nitrogen loss to autotrophic biomass maintenance needs and heterotrophic biomass synthesis requirements.

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