Modeling, monitoring and control of cyclically operated biological wastewater treatment plants

1997 ◽  
Author(s):  
J. E. Claes ◽  
V. G. Ryckaert ◽  
R. Gerards ◽  
L. Vriens ◽  
J. F. Van Impe
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Biological Wastewater Treatment ◽  
Monitoring And Control ◽  
And Control

On-line monitoring equipment for wastewater treatment processes: state of the art

2003 ◽  
Vol 47 (2) ◽  
pp. 1-34 ◽  
Author(s):  
P.A. Vanrolleghem ◽  
D.S. Lee
Keyword(s):  
Wastewater Treatment ◽  
Control Systems ◽  
Model Calibration ◽  
Wastewater Treatment Plants ◽  
Monitoring And Control ◽  
Monitoring Equipment ◽  
Automatic Control Systems ◽  
Treatment Processes ◽  
On Line ◽  
And Control

A (non-exhaustive) survey of new and existing technologies for the monitoring of wastewater treatment plants is presented. Emphasis is given to the way these sensors can provide insight in the ongoing (bio-) processes. Three different uses for sensors can be found: for monitoring (operator support), in automatic control systems and as tools for plant auditing/optimization/modelling by consultants. From this, sensors have been classified in two basic types: (i) reliable, simple and low maintenance sensors for day-to-day monitoring and control and (ii) advanced, higher maintenance sensors that are used in auditing, model calibration and optimisation. The paper is organized according to the typical unit processes of biological wastewater treatment systems: anaerobic digestion, activated sludge, nutrient removal and sedimentation. Attention is drawn to a number of practical problems associated with the use of sophisticated sensors in the harsh (dirty) conditions of wastewater treatment processes. The use of autocalibration and built-in sensor checks, cleaning systems and reliable sample preparation units is illustrated. The paper ends with a discussion of the applicability of the different sensors.

Modeling of the acclimation/deacclimation process of a mixed culture degrading 4-chlorophenol

2004 ◽  
Vol 49 (1) ◽  
pp. 79-86 ◽  
Author(s):  
G. Buitrón ◽  
J. Moreno
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Parameters ◽  
Sequencing Batch Reactor ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Biological Wastewater Treatment ◽  
Negative Effect ◽  
Toxic Substrate ◽  
And Control ◽  
Sludge Activity

The variation of concentration of the toxic substrate has a negative effect on the sludge activity. Although this loss of activity of the microorganisms under toxic starvation has been reported, this variable is not taken into account in the operation of biological wastewater treatment plants. In order to monitor and control the biological plant with a certain confidence it is necessary to consider the acclimation and deacclimation processes to avoid the reactor malfunctioning, resulting in loss of efficiency or in false data acquisition during monitoring. This paper proposes a model for the acclimation/deacclimation process. The experiments have been done in a sequencing batch reactor during the 4-chlorophenol degradation. The basic idea of the model is to consider the variation of the kinetic parameters of the Haldane law in terms of the acclimation and deacclimation state. The idea is discussed, and the results obtained are presented.

Supervisory control of wastewater treatment plants by combining principal component analysis and fuzzy c-means clustering

2001 ◽  
Vol 43 (7) ◽  
pp. 147-156 ◽  
Author(s):  
C. Rosen ◽  
Z. Yuan
Keyword(s):  
Principal Component Analysis ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Principal Component ◽  
Component Analysis ◽  
Biological Wastewater Treatment ◽  
Monitoring And Control ◽  
Process Data ◽  
Fuzzy C Means

In this paper a methodology for integrated multivariate monitoring and control of biological wastewater treatment plants during extreme events is presented. To monitor the process, on-line dynamic principal component analysis (PCA) is performed on the process data to extract the principal components that represent the underlying mechanisms of the process. Fuzzy c-means (FCM) clustering is used to classify the operational state. Performing clustering on scores from PCA solves computational problems as well as increases robustness due to noise attenuation. The class-membership information from FCM is used to derive adequate control set points for the local control loops. The methodology is illustrated by a simulation study of a biological wastewater treatment plant, on which disturbances of various types are imposed. The results show that the methodology can be used to determine and co-ordinate control actions in order to shift the control objective and improve the effluent quality.

Advanced monitoring and control of anaerobic wastewater treatment plants: fault detection and isolation

2001 ◽  
Vol 43 (7) ◽  
pp. 183-190 ◽  
Author(s):  
J-Ph Steyer ◽  
A. Genovesi ◽  
J. Harmand
Keyword(s):  
Wastewater Treatment ◽  
Fault Detection ◽  
Wastewater Treatment Plants ◽  
Real Life ◽  
Practical Interest ◽  
Fault Detection And Isolation ◽  
Monitoring And Control ◽  
On Line ◽  
And Control ◽  
Large Improvement

In this paper, a fault detection and isolation approach using fuzzy logic is described for on-line analysis of problems occurring in anaerobic digestion processes. The measurements available on the process are preprocessed to build a vector of fault residuals indicating the magnitude of the problems. This vector is classified into a prespecified category (i.e., a class) which is a state of the system, according to discrimination fuzzy rules. Three different types of classes were defined in a hierarchical structure : sensors faults, sub-process faults and process faults. This approach was developed to handle in real time both technical and biological problems. Demonstration of the practical interest of this study was made using real life experiments and large improvement of the reliability and safety of the process was obtained, thus optimizing the overall wastewater treatment.

scholarly journals Potential applications of halophilic microorganisms for biological treatment of industrial process brines contaminated with aromatics

2021 ◽  
Author(s):  
Thomas Mainka ◽  
David Weirathmüller ◽  
Christoph Herwig ◽  
Stefan Pflügl
Keyword(s):  
Wastewater Treatment ◽  
Process Monitoring ◽  
Industrial Wastewater ◽  
Continuous Process ◽  
Scale Up ◽  
Monitoring And Control ◽  
Saline Wastewater ◽  
Halophilic Microorganisms ◽  
Industrial Sectors ◽  
And Control

Abstract Saline wastewater contaminated with aromatic compounds can be frequently found in various industrial sectors. Those compounds need to be degraded before reuse of wastewater in other process steps or release to the environment. Halophiles have been reported to efficiently degrade aromatics, but their application to treat industrial wastewater is rare. Halophilic processes for industrial wastewater treatment need to satisfy certain requirements: a continuous process mode, low operational expenditures, suitable reactor systems and a monitoring and control strategy. The aim of this review is to provide an overview of halophilic microorganisms, principles of aromatic biodegradation, and sources of saline wastewater containing aromatics and other contaminants. Finally, process examples for halophilic wastewater treatment and potential process monitoring strategies are discussed. To further illustrate the significant potential of halophiles for saline wastewater treatment and to facilitate development of ready-to-implement processes, future research should focus on scale-up and innovative process monitoring and control strategies.

scholarly journals Energetic flexibility on wastewater treatment plants

2017 ◽  
Vol 76 (5) ◽  
pp. 1225-1233 ◽  
Author(s):  
M. Schäfer ◽  
I. Hobus ◽  
T. G. Schmitt
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Energy Systems ◽  
Energy Market ◽  
Control Parameters ◽  
Effluent Quality ◽  
The Future ◽  
Energy Consuming ◽  
Characteristic Values ◽  
And Control

In the future, an additional potential of control reserve as well as storage capacities will be required to compensate fluctuating renewable energy availability. The operation of energy systems will change and flexibility in energy generation and consumption will rise to a valuable asset. Wastewater treatment plants (WWTPs) are capable of providing the flexibility needed, not only with their energy generators but also in terms of their energy consuming aggregates on the plant. To meet challenges of the future in regard to energy purchase and to participate in and contribute to such a volatile energy market, WWTPs have to reveal their energetic potential as a flexible service provider. Based on the evaluated literature and a detailed analysis of aggregates on a pilot WWTP an aggregate management has been developed to shift loads and provide a procedure to identify usable aggregates, characteristic values and control parameters to ensure effluent quality. The results show that WWTPs have a significant potential to provide energetic flexibility. Even for vulnerable components such as aeration systems, load-shifting is possible with appropriate control parameters and reasonable time slots without endangering system functionality.

The Effects of Diquat Dibromide on Biological Wastewater Treatment Plants

2003 ◽  
Vol 38 (10) ◽  
pp. 2453-2463 ◽  
Author(s):  
C. W. Randall ◽  
E. U. Cokgor ◽  
Z. Kisoglu ◽  
W. Punrattanasin ◽  
U. Erdal ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Biological Wastewater Treatment

Choice of the efficient flow diagram of biological wastewater treatment at municipal wastewater treatment plants

2021 ◽  
Vol 6 (4) ◽  
pp. 244-250
Author(s):  
Serhii Protsenko ◽  
◽  
Mykola Kizyeyev ◽  
Olha Novytska ◽  
◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
High Efficiency ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Dynamic Modelling ◽  
Flow Diagram ◽  
Biological Wastewater Treatment ◽  
Municipal Wastewater Treatment ◽  
Residual Content

The possibility of increasing the efficiency of municipal wastewater treatment plant (WWTP) operation by changing the flow diagram of biological wastewater treatment in aeration tanks at minimum expenses for their reconstruction is shown in the paper on the example of one of the regional centres of Ukraine. The technology of nitri-denitrification of wastewater according to the flow diagram of the two-stage modified Ludzak-Ettinger process is offered for the considered conditions. The distribution of wastewater flows and internal nitrate recycling between the individual stages of this flow diagram has been optimized in order to minimize the residual content of total nitrogen in the treated effluents. Computer dynamic modelling of biochemical processes has proved the high efficiency and reliability of the flow diagram proposed by the authors.

Sign in / Sign up

Export Citation Format

Share Document