Modelling of enhanced CSO treatment in secondary clarifiers with a modified Activated Sludge Model no. 3

2008 ◽  
Vol 58 (3) ◽  
pp. 609-615 ◽  
Author(s):  
M. Ahnert ◽  
N. Günther ◽  
V. Kuehn ◽  
P. Krebs ◽  
K. Svardal ◽  
...  
Keyword(s):  
Water Treatment ◽  
Numerical Modelling ◽  
Activated Sludge ◽  
Pilot Scale ◽  
Nitrogen And Phosphorus ◽  
Activated Sludge Model ◽  
Alternative Approach ◽  
Set Up ◽  
Receiving Water ◽  
Good Agreement

An alternative approach for combined water treatment as opposed to its CSO discharge into receiving water is its bypass to the inlet of secondary clarifiers (SC). To analyse the processes and to evaluate the performance of this approach, experiments and numerical modelling were carried out. In batch and pilot scale experiments major effects were identified and quantified. The Activated Sludge Model No. 3 (ASM3) was modified to simulate the batch and pilot scale experiments for implementation of the bypass-specific processes and thus to set up an overall balance of the relevant compounds. With some modifications of ASM3, good agreement of the modelling results with measurements of COD, nitrogen and phosphorus were achieved.

Boston Harbor Clean-Up: Comparison of Conventional Oxygen Activated Sludge with and without Anaerobic Selectors

1992 ◽  
Vol 25 (4-5) ◽  
pp. 281-287 ◽  
Author(s):  
P. T. Bowen ◽  
V. S. Magar ◽  
R. Otoski ◽  
T. McMonagle
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Design Parameters ◽  
Boston Harbor ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Activated Sludge Processes ◽  
Treatment Design

To determine secondary treatment design parameters for the Massachusetts Water Resources Authority Deer Island Treatment Facility, a pilot study was conducted. Due to the constricted site, oxygen activated sludge processes were considered. A pilot-scale conventional oxygen activated sludge (COAS) and COAS preceded by an anaerobic selector process (ASP) were compared. Both processes achieved comparable levels of total and soluble BOD, total and soluble COD, total nitrogen, ammonia nitrogen, and phosphorus removal. Higher percent removals occurred during the spring and summer flow periods. Neither process appeared more stable than the other with respect to changing influent loading and hydraulic stress. Differences in the process were the sludge settleability and sludge yield. The ASP had a slightly higher sludge yield than COAS, but the solids settled faster.

Comparison of A2/O and Membrane Bioreactor Processes for Municipal Wastewater Treatment: Nutrient Removal Performance and Sludge Characteristics

2011 ◽  
Vol 356-360 ◽  
pp. 1647-1654
Author(s):  
Rong Chang Wang ◽  
Shu Peng Si ◽  
Dian Hai Yang ◽  
Jian Fu Zhao
Keyword(s):  
Activated Sludge ◽  
Uptake Rate ◽  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Ammonia Removal ◽  
Municipal Wastewater Treatment ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
The Difference

The performance of nitrogen and phosphorus removal was investigated in pilot-scale A2/O, A2/O-MBR and mA2/O-MBR processes for treating municipal wastewater. The results show that these processes had a similar COD and ammonia removal efficiency, but A2/O process had better denitrification efficiency than MBR processes. In order to explain the difference of nitrogen and phosphorus removal performance in the investigated processes, specific oxygen uptake rate (SOUR), specific denitrification rate (SDNR), anaerobic release rate and anoxic and aerobic uptake rate of the activated sludge taken from A2/O and mA2/O-MBR processes were compared. The results show that the activated sludge of mA2/O-MBR process had a higher nitrifying activity in aerobic tank than A2/O process, the denitrifying activity in anoxic tanks were roughly equal and A2/O process had a higher denitrifying phosphorus removal activity in anoxic tank than mA2/O-MBR process.

scholarly journals Simulation of an Oxic-Settling-Anaerobic Pilot Plant Operated under Real Conditions Using the Activated Sludge Model No.2d

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3383
Author(s):  
Rosa Vitanza ◽  
Angelo Cortesi ◽  
Vittorino Gallo ◽  
Maria E. De Arana ◽  
Ioanna A. Vasiliadou
Keyword(s):  
Activated Sludge ◽  
Pilot Plant ◽  
Major Influence ◽  
Predictive Capacity ◽  
Activated Sludge Model ◽  
Polyphosphate Accumulating Organisms ◽  
Activated Sludge Processes ◽  
Related Process ◽  
Theoretical Results ◽  
Good Agreement

Oxic-settling-anaerobic (OSA) process has been introduced into the treatment line of wastewater in order to upgrade activated sludge processes and to reduce the production of excess sludge. The aim of the present study was to simulate the performance of an OSA pilot plant by implementing the Activated Sludge Model No.2d (ASM2d) into a mathematical modelling software (BioWin). The stepwise calibration, performed both by off-line experiments and software dynamic calibration, was carried out in a heuristic way, adjusting the parameters values that showed a major influence to the effluent and internal concentrations. All the reduction factors introduced into ASM2d to simulate the processes occurring in anoxic and anaerobic conditions were lowered in order to reproduce the concentrations of interest. In addition, the values of parameters of the PAOs (polyphosphate accumulating organisms)-related process (namely qPHA and YPO4) were found lower than those usually adopted. In general, theoretical results were in good agreement with the experimental data obtained from plant’s operation, showing an accurate predictive capacity of the model. Good performance was achieved considering the phosphorus removal related process, while some failures were detected in COD and ammonia simulations.

Application of the IAWQ activated sludge model to nutrient removal process

1997 ◽  
Vol 35 (8) ◽  
pp. 111-118 ◽  
Author(s):  
T. Mino ◽  
D. C. San Pedro ◽  
S. Yamamoto ◽  
T. Matsuo
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Hydrolysis Rate ◽  
Substrate Uptake ◽  
Nitrogen And Phosphorus ◽  
State Behavior ◽  
Activated Sludge Model ◽  
Static Data ◽  
The Moment ◽  
Parameter Values

IAWQ Activated Sludge Model No.2, with the parameter values recommended by the IAWQ Task Group, was capable of predicting the behavior of a nutrient removal activated sludge pilot plant in Japan rather well except for the profile of NH4-N and NOx-N. The model was calibrated for the process and procedures for the calibration of the model are proposed. By applying the proposed calibration procedures, Activated Sludge Model No.2 has been satisfactorily calibrated to simulate the steady state behavior of the process in terms of organic matter and nitrogen removal. but, sometimes, selection of the specific growth rate of nitrifiers gives very sensitive effect on nitrate concentration in the effluent. It is indicated that the rate of anaerobic processes is affected by hydrolysis of particulate organic or slowly biodegradable substrates, and the hydrolysis can be the rate limiting step of the removal of organic matters or, sometimes, nitrogen and phosphorus. At the moment, it is rather risky to estimate the anaerobic hydrolysis rate, the anaerobic substrate uptake rate by phosphate accumulating organisms and the PHA yield with respect to polyphosphate utilization simultaneously only by using static data. The present case shows how relevant calibration procedures can be developed with limited static data.

Test of the Activated Sludge Model's Capabilities as a Prognostic Tool on a Pilot Scale Wastewater Treatment Plant

1992 ◽  
Vol 25 (6) ◽  
pp. 185-194 ◽  
Author(s):  
Jan Pedersen ◽  
Ole Sinkjær
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Pilot Plant ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Prognostic Tool ◽  
Activated Sludge Model ◽  
Simulation Programme ◽  
Positive Results

A newly developed simulation programme, based on the Activated Sludge Model No. 1, was used to investigate the model's abilities to predict variations in a Bio-Denipho pilot plant. The model was tested under both normal conditions and in connection with an inhibition incident on the pilot plant with positive results.

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