Combining CFD, FLOC Dynamics, and Biological Reaction Kinetics to Model Carbon and Nitrogen Removal in an Activated Sludge System

2011 ◽  
Vol 2011 (13) ◽  
pp. 3272-3282 ◽  
Author(s):  
A. P. Sobremisana ◽  
J. J. Ducoste ◽  
F. L. de los Reyes
Keyword(s):  
Activated Sludge ◽  
Reaction Kinetics ◽  
Nitrogen Removal ◽  
Carbon And Nitrogen ◽  
Activated Sludge System ◽  
Biological Reaction

Denitrificiation in a Non-Nitrifying Activated Sludge System

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1097-1104 ◽  
Author(s):  
A. Lyngå ◽  
P. Balmér
Keyword(s):  
Organic Matter ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Cost Effective ◽  
Pilot Scale ◽  
Anoxic Zone ◽  
Sludge Treatment ◽  
Activated Sludge System ◽  
Cost Effective Method ◽  
Nitrate Supply

Post-nitrification and recycling of the nitrified effluent to an anoxic zone in an activated sludge system for denitrification is proposed as a potentially cost-effective method for nitrogen removal in existing activated sludge treatment plants. Denitrification in a non-nitrifying activated sludge system with a SRT of 3-4 days has been studied in pilot scale. The results show that denitrification rates of at least 10 g N03-N/(kgVSS h) can be achieved. At COD/NO3-N ratios above 15, nitrate supply appears to control the denitrification rate while at COD/NO3-N ratios below 15 the rate appears to be controlled by the supply of easily biodegradable organic matter.

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.

Internal recycle to improve denitrification in a step feed anoxic/aerobic activated sludge system

2009 ◽  
Vol 60 (7) ◽  
pp. 1661-1668 ◽  
Author(s):  
C. A. Boyle ◽  
C. J. McKenzie ◽  
S. Morgan
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Anoxic Zone ◽  
Activated Sludge System ◽  
Low Load ◽  
Aerobic Zone ◽  
Wastewater Treatment Plant Effluent

During periods of low load (weekends and holidays) the Mangere wastewater treatment plant effluent has breached the summer consent conditions for total nitrogen. The purpose of this research was to determine if an internal recycle would improve nitrogen removal in the anoxic/aerobic activated sludge reactors sufficient to meet the summer resource consent standard. The recycle returned nitrate rich mixed liquor from the downstream aerobic zone back to the initial anoxic zone, thus potentially improving denitrification. A full scale trial showed that installation of the internal recycle on each RC would have satisfied the resource consent for total nitrogen in most cases over the three summer resource consent periods since the upgrade. However, further modifications of the internal recycle would be required to ensure that consent conditions were satisfied at all times and to improve the consistency of the results.

A PROCEDURE FOR BENCHMARKING SPECIFIC FULL-SCALE ACTIVATED SLUDGE PLANTS USED FOR CARBON AND NITROGEN REMOVAL

2002 ◽  
Vol 35 (1) ◽  
pp. 29-34 ◽  
Author(s):  
A. Abusam ◽  
K.J. Keesman ◽  
H. Spanjers ◽  
G. van Straten ◽  
K. Meinema
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Full Scale ◽  
Carbon And Nitrogen
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