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).

A comparison of NH4/NO3 control strategies for alternating activated sludge processes

1999 ◽  
Vol 39 (4) ◽  
pp. 93-102 ◽  
Author(s):  
L. J. S. Lukasse ◽  
K. J. Keesman ◽  
A. Klapwijk ◽  
G. van Straten
Keyword(s):  
Activated Sludge ◽  
Time Delays ◽  
Control Strategies ◽  
Treatment Plant ◽  
Biological Processes ◽  
Effluent Quality ◽  
N Removal ◽  
Activated Sludge Reactor ◽  
The Difference ◽  
Activated Sludge Processes

Four control strategies for N-removal in alternating activated sludge plants (ASP's) are compared: 1. timer-based, 2. switching the aeration on/off when depletion of nitrate/ammonium is detected, 3. switching the aeration on/off when ammonium crosses an upper/lower-bound, 4. the newly developed adaptive receding horizon optimal controller (ARHOC) as presented in Lukasse et al. (1997). The comparison is made by simulating the controllers' application to an alternating continuously-mixed activated sludge reactor preceded by a small anoxic reactor for predenitrification. The biological processes in the reactors are modelled by the activated sludge model no. 1. Realistic influent patterns, measured at a full-scale wastewater treatment plant, are used. The results show that three totally different controllers (timer-based, NH4-bounds based and ARHOC) can achieve a more or less equal effluent quality, if tuned optimally. The difference mainly occurs in the sensitivity to suboptimal tunings. The timer-based strategy has a higher aeration demand. The sensitivity of the ARHOC controller to sub-optimal tuning, known measurement time delays and changing plant loads is significantly less than that of the other controllers. Also its tuning is more natural and explicit.

Enhanced nutrient removal MBR system with chemical addition for low effluent TP

2011 ◽  
Vol 64 (6) ◽  
pp. 1298-1306 ◽  
Author(s):  
Wen-jun Liu ◽  
Zhi-rong Hu ◽  
R. L. Walker ◽  
P. L. Dold
Keyword(s):  
Activated Sludge ◽  
Model Simulation ◽  
Chemical Precipitation ◽  
Pilot Test ◽  
Activated Sludge Model ◽  
Effluent Quality ◽  
Precipitation Model ◽  
Optimizing Design ◽  
Dynamic Loading Conditions ◽  
P Removal

A pilot study was conducted to test an membrane bioreactor (MBR) process for combined biological and chemical P removal to achieve a very low effluent total phosphorus (TP) concentration of 0.025 mg P/L. With the data from the pilot test, a simulation study was performed to demonstrate that: (1) the pilot system behaviour (effluent quality, MLSS, etc.) can be modelled accurately with an activated sludge model combined with a chemical precipitation model; and (2) with the calibrated model, simulation scenarios can be performed to further understand the pilot MBR process, and provide information for optimizing design and operation when applied at full-scale. Results from the pilot test indicated that the system could achieve very low effluent TP concentration through biological P removal with a limited chemical addition, and chemical addition to remove P to very low level did not affect other biological processes, i.e., organic and nitrogen removal. Simulation studies indicate that the process behaviour can be modelled accurately with an activated sludge model combined with a chemical precipitation model, and the calibrated model can be used to provide information to optimize system design and operation, e.g., chemical addition control under dynamic loading conditions is important for maintaining biological P removal.

Modelling of the Secondary Clarifier Combined with the Activated Sludge Model No. 1

1992 ◽  
Vol 25 (6) ◽  
pp. 285-300 ◽  
Author(s):  
René Dupont ◽  
Mogens Henze
Keyword(s):  
Wastewater Treatment ◽  
Simple Model ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Activated Sludge Model ◽  
Effluent Quality ◽  
Secondary Clarifier ◽  
Hydraulic Load ◽  
Flux Model

Modelling of activated sludge wastewater treatment plants is today generally based on the Activated Sludge Model No. 1 combined with a very simple model for the secondary settler. This paper describes the development of a model for the secondary clarifier based on the general flux theory for zone settling, which can be used in combination with the Activated Sludge Model to form a dynamic computer model/program for a wastewater treatment plant. In addition to the flux model, the developed model includes a simple model for predicting the contents of paniculate components in the effluent This latter model is a purely empirical model, which connects the effluent quality with the hydraulic load, suspended solids load and the nitrate load. The paper describes the model and gives some basic examples on computer simulations and verification of the model.

Comparative study of membrane bioreactor (MBR) and activated sludge processes in the treatment of Moroccan domestic wastewater

2018 ◽  
Vol 78 (5) ◽  
pp. 1129-1136 ◽  
Author(s):  
S. Kitanou ◽  
M. Tahri ◽  
B. Bachiri ◽  
M. Mahi ◽  
M. Hafsi ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Ceramic Membrane ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Quality Parameters ◽  
Effluent Quality ◽  
Conventional Activated Sludge ◽  
Activated Sludge Processes

Abstract The study was based on an external pilot-scale membrane bioreactor (MBR) with a ceramic membrane compared to a conventional activated sludge process (ASP) plant. Both systems received their influent from domestic wastewater. The MBR produced an effluent of much better quality than the ASP in terms of total suspended solids (TSS), 5-day biological oxygen demand (BOD5) and chemical oxygen demand (COD), total phosphorus (TP) and total nitrogen (TN). Other effluent quality parameters also indicated substantial differences between the ASP and the MBR. This study leads to the conclusion that in the case of domestic wastewater, MBR treatment leads to excellent effluent quality. Hence, the replacement of ASP by MBR may be justified on the basis of the improved removal of solids, nutrients, and micropollutants. Furthermore, in terms of reuse the high quality of the treated water allows it to be reused for irrigation.

scholarly journals Side-stream sludge treatment using free ammonia for reducing sludge production

2019 ◽  
Vol 25 (2) ◽  
pp. 163-170
Author(s):  
Kang Song ◽  
Xu Zhou ◽  
Yi-Wen Zhou ◽  
Wenbiao Jin ◽  
Renjie Tu
Keyword(s):  
Activated Sludge ◽  
Free Ammonia ◽  
Treatment Unit ◽  
Sludge Treatment ◽  
Effluent Quality ◽  
Side Stream ◽  
Sludge Properties ◽  
Treatment And Disposal ◽  
High Treatment ◽  
Sludge Production

Much attention has been paid to reducing of excess sludge production in the activated sludge process, due to high treatment and disposal costs. In this study, an innovative approach for achieving sludge reduction, which featured recirculating a portion of the activated sludge through a side-stream sludge treatment unit, was applied by adding free ammonia (FA, i.e., NH3). The results showed that sludge production was significantly reduced after FA treatment, while the sludge production rate was decreased by 21%. Meanwhile, the treatment performance and the sludge properties were not negatively affected by the FA-treated sludge during the experiment (e.g. effluent quality, nitrification activity, sludge settleability). Economic analysis also indicated that the FA treatment approach would be an economically favorable technology, and the sludge treatment costs could be cut by 16.6%.

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.

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