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.

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.

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

Upgrading for Biological Nitrogen Removal – Some Full-Scale Experiences from Sweden

1990 ◽  
Vol 22 (7-8) ◽  
pp. 93-104 ◽  
Author(s):  
Bengt Andersson ◽  
Björn Rosén
Keyword(s):  
Nitrogen Removal ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Development Program ◽  
Organic Content ◽  
Full Scale ◽  
Municipal Sewage ◽  
Biological Nitrogen Removal ◽  
Sewage Treatment Plants ◽  
Biological Nitrogen

Nitrogen removal is now required by the Swedish parliament. The new requirements will be valid before 1995 and in some cases before 1992. A comprehensive development program, mostly in full scale at about 35 municipal sewage treatment plants, has been started to meet the new demands. In order to co-ordinate all activities, a National Nitrogen Project with representatives from authorities and municipalities has been formed. The general ambition is to meet the demand by process development, using existing volumes rather than to invest in civil works. A Swedish concept has appeared, which in most cases has served as a guideline for the development program. The basic principles are to decrease the load on the biological process by pre-precipitation, to utilize the remaining organic content in the wastewater in a pre-denitrification system, to increase the active biomass in the biological system and to use a two-sludge system with post-denitrification. In this paper, some experiences from the activities in Sweden are discussed and exemplified with results mainly from Falkenberg, Malmö and Norrköping. The treatment plant in Falkenberg was the first to introduce biological nitrogen removal in Sweden. A pre-denitrification system has been in operation since May 1983 with good results. Comprehensive full-scale and pilot tests are in operation at the Sjölunda and Klagshamn sewage treatment plants in Malmö. Special interests have been paid to studies on different applications of fixed film technology. The plant in Norrköping is operated with pre-precipitation followed by combined pre- and post-denitrification.

Enhancing biological nitrogen removal in a small wastewater treatment plant by regulating the air supply

2004 ◽  
Vol 48 (11-12) ◽  
pp. 445-452 ◽  
Author(s):  
M. Fiter ◽  
J. Colprim ◽  
M. Poch ◽  
I. Rodríguez-Roda
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Low Cost ◽  
Treatment Plant ◽  
Biological Nitrogen Removal ◽  
Air Supply ◽  
Safety Margins ◽  
Biological Nitrogen

Most of the small wastewater treatment plants in Catalonia were not designed to remove nutrients. However, the large safety margins built into their original engineering design has meant that, in many cases, it has been possible to remove part of the nitrogen without being controlled. This paper focuses on the practical experience carried out in one of these facilities, the Bisbal wastewater treatment plant, aimed at enhancing the biological nitrogen removal using simple, low-cost, easy-to-operate measurement and control. The control strategy, which is based on air supply regulation, was previously designed using simulation studies. A dissolved oxygen monitoring system was installed into the facility, while nitrogen concentrations were analysed every day. Optimal dissolved oxygen profiles in the oxidation ditch were identified, while the air supply strategy was modified according to the variations in the influent.

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