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.

Calibrating a side-stream membrane bioreactor using Activated Sludge Model No. 1

2005 ◽  
Vol 52 (10-11) ◽  
pp. 359-367 ◽  
Author(s):  
T. Jiang ◽  
X. Liu ◽  
M.D. Kennedy ◽  
J.C. Schippers ◽  
P.A. Vanrolleghem
Keyword(s):  
Activated Sludge ◽  
Biological Behaviour ◽  
Activated Sludge Model ◽  
Effluent Quality ◽  
Side Stream ◽  
Steady State Operation ◽  
Autotrophic Biomass ◽  
Biological Performance ◽  
Activated Sludge Processes ◽  
Influent Wastewater

Membrane bioreactors (MBRs) are attracting global interest but the mathematical modeling of the biological performance of MBRs remains very limited. This study focuses on the modeling of a side-stream MBR system using the Activated Sludge Model No. 1 (ASM1), and compares the results with the modeling of traditional activated sludge processes. ASM1 parameters relevant for the long-term biological behaviour in MBR systems were calibrated (i.e. YH = 0.72gCOD/gCOD, YA = 0.25gCOD/gN, bH = 0.25d−1, bA = 0.080d−1 and fP = 0.06), and generally agreed with the parameters in traditional activated sludge processes, with the exception that a higher autotrophic biomass decay rate was observed in the MBR. Influent wastewater characterization was proven to be a critical step in model calibration, and special care should be taken in characterizing the inert particulate COD (XI) concentration in the MBR influent. It appeared that the chemical–biological method was superior to the physical–chemical method. A sensitivity analysis for steady-state operation and DO dynamics suggested that the biological performance of the MBR system (the sludge concentration, effluent quality and the DO dynamics) are very sensitive to the parameters (i.e. YH, YA, bH, bA μmaxH and μmaxA), and influent wastewater components (XI, Ss, Xs and SNH).

Calibration of kinetic parameters in the IAWQ Activated Sludge Model: a pilot scale experience

2000 ◽  
Vol 42 (3-4) ◽  
pp. 29-34 ◽  
Author(s):  
H. Satoh ◽  
E. Okuda ◽  
T. Mino ◽  
T. Matsuo
Keyword(s):  
Activated Sludge ◽  
Accumulation Rate ◽  
Pilot Scale ◽  
Hydrolysis Rate ◽  
Biological Phosphorus Removal ◽  
Urban Sewage ◽  
Polyphosphate Accumulation ◽  
Polyphosphate Accumulating Organisms ◽  
Activated Sludge Processes ◽  
Biological Phosphorus

The parameters in the mathematical simulation model for the nutrient removal activated sludge process were calibrated by using operational performance data obtained on enhanced biological phosphorus removal activated sludge processes treating urban sewage. By changing five parameters, maximum specific growth rate of nitrifiers, saturation constant of ammonia for nitrifiers, maximum specific hydrolysis rate under anaerobic conditions, maximum specific fermentation rate, and maximum specific polyphosphate accumulation rate of polyphosphate accumulating organisms (PAOs), the process performance was well reproduced by simulation. For the improvement of simulation, inclusion of the formation or presence of soluble COD which is not utilized by PAOs either directly or via fermentation was proposed.

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.

Updated Activated Sludge Model n°1 Parameter Values for Improved Prediction of Nitrogen Removal in Activated Sludge Processes: Validation at 13 Full-scale Plants

2009 ◽  
Vol 81 (9) ◽  
pp. 858-865 ◽  
Author(s):  
Jean-Marc Choubert ◽  
Anne-Emmanuelle Stricker ◽  
Aurélien Marquot ◽  
Yvan Racault ◽  
Sylvie Gillot ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Full Scale ◽  
Activated Sludge Model ◽  
Parameter Values ◽  
Activated Sludge Processes

Examination of the Activated Sludge Model No. 2 with an alternating process

1995 ◽  
Vol 31 (2) ◽  
pp. 55-66 ◽  
Author(s):  
S. Isaacs ◽  
J. A. Hansen ◽  
K. Schmidt ◽  
M. Henze
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Pilot Plant ◽  
Pilot Scale ◽  
Phosphate Removal ◽  
Data Series ◽  
Batch Experiments ◽  
Phosphate Release ◽  
Activated Sludge Model ◽  
The Third

Three series of data obtained in a pilot-scale alternating-type activated sludge nutrient removal process are examined in light of the recently introduced Activated Sludge Model No. 2 (ASM2). The first data series was collected while adding acetate to the inlet to improve phosphate removal. ASM2 can explain why phosphate levels first rise before an improvement occurs based on a slow build-up of internally stored polyhydroxyalkanoates (PHA). The second and third data series represent batch experiments performed in the pilot plant, and show the effect of nitrate on phosphate release. ASM2 could describe the second data series well after including one additional reaction to account for denitrification by phosphate accumulating organisms. The third data series examines the effect of the rate of acetate addition, and shows that this affects the rate of anoxic phosphate release more strongly than it does the denitrification rate.

Treatment of municipal wastewater in a hybrid process using a new suspended carrier with large surface area

2004 ◽  
Vol 49 (11-12) ◽  
pp. 207-214 ◽  
Author(s):  
M. Christensson ◽  
T. Welander
Keyword(s):  
Activated Sludge ◽  
Surface Area ◽  
Pilot Plant ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Large Surface Area ◽  
Hybrid Process ◽  
Nitrification Rate ◽  
Suspended Carrier ◽  
Activated Sludge Processes

An activated sludge/biofilm hybrid process treating municipal wastewater was studied in pilot plant trials. A new type of suspended carrier, with large effective surface area, was employed in the process with the aim of enhancing nitrification. The pilot plant was operated for 1.5 years in five different configurations including pre-denitrification in all five and enhanced biological phosphorus removal in the final two. The wastewater temperature ranged between 11°C and 20°C, and the nominal dissolved oxygen (DO) level was 5-6 mg/L. The nitrification rate obtained on the new carrier within the hybrid stage was in the range of 0.9-1.2 g NH4-N/m2/d corresponding to a volumetric rate of 19-23 g NH4-N/m3/h (total nitrification including nitrification in the suspended solids). More than 80% of the total nitrification took place on the carrier (and the remainder in the suspended solids). The nitrification rate was shown to correlate with DO, decreasing when the DO was decreased. The results supported the idea of using the new carrier as a tool to upgrade plants not having nitrification today or improve nitrification in activated sludge processes not reaching necessary discharge levels. The large surface area present for nitrification makes it possible to obtain high nitrification rates within limited volumes. The possibility to keep the total suspended solid content low (<3 g/L) and avoiding problems with the filament Microthrix parvicella, are other beneficial properties of the hybrid process.

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.

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

The Use of Anoxic Selectors for the Control of Low F/M Activated Sludge Bulking

1989 ◽  
Vol 21 (6-7) ◽  
pp. 609-619 ◽  
Author(s):  
Y.-J. Shao ◽  
David Jenkins
Keyword(s):  
Organic Matter ◽  
Activated Sludge ◽  
Pilot Plant ◽  
Detention Time ◽  
Substrate Removal ◽  
Batch System ◽  
Sludge Bulking ◽  
N Removal ◽  
Soluble Substrate ◽  
Activated Sludge Systems

Laboratory and pilot plant experiments on anoxic selector activated sludge systems were conducted on two wastewaters in some cases supplemented with nitrate, acetate or glucose. To prevent bulking sufficient anoxic selector detention time and nitrate levels must be available to reduce selector effluent soluble COD to below 100 mg/l and to reduce readily metabolizable organic matter to virtually zero (< 1 mg/l). Soluble COD/NO3-N removal stoichiometry is in the range 6.0-6.7. Selector systems have elevated soluble substrate removal and denitrification rates compared to CSTR systems. These rates are not affected greatly by temperature (20-25°C) for CSTR sludges but are for selector sludges. Upon exhaustion of nitrate in a selector soluble COD leaks out of the activated sludge in significant amounts. Thiothrix sp. and type 021N denitrify only to NO2 and at much slower rates than Zoogloearamigera does to N2. A sequencing batch system provides an optimistic estimate of the SVI that can be obtained by an anoxic selector system.

Activated Sludge Treatment of Kraft Mill Effluents from Conventional and Oxygen Bleaching

1991 ◽  
Vol 24 (3-4) ◽  
pp. 427-430 ◽  
Author(s):  
J. Nevalainen ◽  
P.-R. Rantala ◽  
J. Junna ◽  
R. Lammi
Keyword(s):  
Activated Sludge ◽  
Kraft Pulp ◽  
Activated Sludge Process ◽  
Chlorinated Phenols ◽  
Pulp Mills ◽  
Main Interest ◽  
Sludge Treatment ◽  
Kraft Pulp Mills ◽  
Activated Sludge Processes ◽  
Oxygen Bleaching

Conventional and oxygen bleaching effluents from hardwood kraft pulp mills were treated in laboratory-scale activated sludge processes. The main interest was the fate of organochlorine compounds in the activated sludge process. In the treatment of conventional bleaching wastewaters the BOD7-reduction was 80-91 % and in oxygen bleaching wastewaters 86-93 %. The respective CODCr removals were about 40 % and about 50 %. The AOX reductions were on average 22 % and 40 % in the treatment of conventional and oxygen bleaching effluents, respectively. The reductions of chlorinated phenols, guajacols and catecols were usually more than 50 % in both reactors. Very little accumulation of AOX into the sludge was observed. The stripping of AOX from aeration unit was insignificant.

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