Model Based On-Line Control of Sewer Systems

1993 ◽  
Vol 28 (11-12) ◽  
pp. 87-98
Author(s):  
Jörgen Bo Nielsen ◽  
Sten Lindberg ◽  
Poul Harremöes
Keyword(s):  
Real Time ◽  
Software Package ◽  
Control Strategies ◽  
Forecast Model ◽  
Central Feature ◽  
Real Time Control ◽  
Sewer System ◽  
Model Based ◽  
Sewer Systems ◽  
On Line

A new software package has been developed for use in real-time control of the flow in combined sewer systems (CSS). A central feature of the new package is forecast modelling of the flows and volumes in the sewer system. Based upon the forecast model predictions, an expert system or an optimisation module determines the set-points for all regulators in the system. The new software package includes a comprehensive tool-set for use in the design of on-line control systems, including a model-based real-time simulator, which can be applied in the testing of control strategies. The first practical application of the software package for a sewer system in the city of Aalborg is described.

Pollution based real time control strategies for combined sewer systems

1997 ◽  
Vol 36 (8-9) ◽  
pp. 331-336 ◽  
Author(s):  
Gabriela Weinreich ◽  
Wolfgang Schilling ◽  
Ane Birkely ◽  
Tallak Moland
Keyword(s):  
Real Time ◽  
Control Strategies ◽  
Ammonia Nitrogen ◽  
Simple Extension ◽  
Real Time Control ◽  
Time Control ◽  
Sewer Systems ◽  
Receiving Waters ◽  
Tunnel System

This paper presents results from an application of a newly developed simulation tool for pollution based real time control (PBRTC) of urban drainage systems. The Oslo interceptor tunnel is used as a case study. The paper focuses on the reduction of total phosphorus Ptot and ammonia-nitrogen NH4-N overflow loads into the receiving waters by means of optimized operation of the tunnel system. With PBRTC the total reduction of the Ptot load is 48% and of the NH4-N load 51%. Compared to the volume based RTC scenario the reductions are 11% and 15%, respectively. These further reductions could be achieved with a relatively simple extension of the operation strategy.

Astlingen – a benchmark for real time control (RTC)

2018 ◽  
Vol 2017 (2) ◽  
pp. 552-560 ◽  
Author(s):  
Manfred Schütze ◽  
Maja Lange ◽  
Michael Pabst ◽  
Ulrich Haas
Keyword(s):  
Real Time ◽  
Preliminary Analysis ◽  
Control Strategies ◽  
Treatment Plant ◽  
Drainage System ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
System 2 ◽  
Water Association

Abstract This contribution serves two purposes. (1) It presents an updated version of the Astlingen example developed by the working group ‘Integral Real Time Control’ of the German Water Association (DWA), which serves as a benchmark example for the setup and evaluation of real time control strategies. As this benchmark is also intended for educational use, it demonstrates a simple RTC algorithm, illustrating the main concepts of RTC of drainage system. (2) The paper also encourages the preliminary analysis of the potential feasibility and benefit of a temporal increase of inflow to the wastewater treatment plant (WWTP) before analysing the WWTP behaviour in detail. For the present example, RTC within the sewer system alone led to almost the same reduction of overflow volume as permitting the inflow to the WWTP to be increased for 6 h within any 24 h, if at all permitted.

Effet de la propagation non linéaire des débits sur le contrôle en temps réel des débordements de réseaux unitaires

1989 ◽  
Vol 16 (2) ◽  
pp. 119-123
Author(s):  
Lucie Wilson ◽  
Denis Isabel ◽  
Jean-Pierre Villeneuve
Keyword(s):  
Real Time ◽  
Linear Models ◽  
Control Strategies ◽  
Real Time Control ◽  
Sewer System ◽  
Prediction Horizon ◽  
Time Control ◽  
Combined Sewer ◽  
Combined Sewer System ◽  
Propagation Non Linéaire

A number of reports on simulations of real-time control of combined sewer system runoff have been published. Most of the control strategies suggested use linear models to calculate discharge routing. We used a nonlinear model for discharge routing and some of our findings differ from those obtained in earlier studies. In particular, it appears that the prediction horizon used for control optimization could be favourably shorter than the time of system flow-through. Key words: combined sewer system overflow, real-time control, nonlinear programming, discharge propagation. [Journal translation]

Aspects of Radar Rainfall Forecasts and their Effectiveness for Real Time Control -The Example of the Sewer System of the City of Vienna

2007 ◽  
Vol 2 (2) ◽  
Author(s):  
Stefan Krämer ◽  
Lothar Fuchs ◽  
Hans-Reinhard Verworn
Keyword(s):  
Real Time ◽  
Mean Squared Error ◽  
Forecast Error ◽  
Forecast Model ◽  
Error Component ◽  
Real Time Control ◽  
Sewer System ◽  
Radar Rainfall ◽  
Time Control ◽  
The City

This paper describes the application of a radar rainfall forecast model in combination with a hydrodynamic runoff model to predict flows is a sewer system. The results for three events of different type of rainfall are assessed on both the rainfall side and the runoff side with respect to their effectiveness for real time control. A quantification of the forecast error depending on the lead time is done using an error component analysis based on the mean squared error of the areal catchment rainfall. The benefit of flow forecasting is clearly demonstrated.

scholarly journals Real time control of the sewer system of boulogne billancourt - a contribution to improving the water quality of the seine

1998 ◽  
Vol 37 (1) ◽  
pp. 327-332 ◽  
Author(s):  
Stéphane Entem ◽  
Antoine Lahoud ◽  
Lars Yde ◽  
Bo Bendsen
Keyword(s):  
Real Time ◽  
Real Time Control ◽  
Sewer System ◽  
Time Model ◽  
The Real ◽  
Radar Images ◽  
Time Control ◽  
River Seine ◽  
On Line ◽  
Study Zone

Confronted with the problem of overflows from its combined sewer system into the River Seine during rainfall, the Department of the Hauts de Seine (which covers some thirty urban districts on the west side of Paris) has decided to implement the real time control of its sewer system. To initiate this plan, as the town of Boulogne Billancourt seemed to be a particularly favourable site for the use of such techniques, a project to control its sewer system in real time has been implemented within the scope of the SPRINT 226 programme financed by the European Community. The preliminary studies, based on a MOUSE computer model of the sewer system, showed that the real time control of the sewer network under study had a high potential benefit, since it would allow an 80% reduction of the volumes of waste water discharged into the Seine annually in the study zone. Following on from these encouraging results, the installation of a complete real time control system was set in hand. The system, at present undergoing testing and evaluation, consists principally of a MOUSE ON LINE real time model and a system for forecasting rainfall by means of radar images.

Hystem-Extran – Improvements to EPA-Extran

1994 ◽  
Vol 29 (1-2) ◽  
pp. 63-71
Author(s):  
Lothar Fuchs ◽  
Claudia Scheffer
Keyword(s):  
Real Time ◽  
Control Strategy ◽  
Single Event ◽  
Real Time Control ◽  
Sewer System ◽  
Continuous Simulation ◽  
Time Control ◽  
Control Centre ◽  
On Line ◽  
Further Development

The paper describes extensions to the EPA-EXTRAN module which can be used for single event or continuous rainfall-runoff simulations as well as for real time control purposes. For surface runoff three different approaches are described. Their use depends on the goal of the simulations - single event or continuous simulation - or the availability of appropriate data (detailed or lumped simulation). The extensions and modifications of the EXTRAN block are reducing stability problems at special structures and make it possible to simulate real-time control devices. The on-line version makes it possible to simulate the behaviour of these devices to test the control strategy for an existing sewer system. The model can be used for training the operators - connected to the control centre and using the available environment - or for testing and further development of the control strategy in a stand alone mode or connected to another PC.

Improvement of a recirculating plant by introducing star control

1995 ◽  
Vol 31 (2) ◽  
pp. 171-180 ◽  
Author(s):  
Marinus K. Nielsen ◽  
Tine B. Önnerth
Keyword(s):  
Wastewater Treatment ◽  
Real Time ◽  
Wastewater Treatment Plants ◽  
Control Strategies ◽  
Biological Nutrient Removal ◽  
Practical Implementation ◽  
Real Time Control ◽  
Dynamic Identification ◽  
Time Control ◽  
On Line

During the last 20 years, control of wastewater treatment plants has developed from very simple to advanced computer control methods based on on-line measurements. Fortunately, both on-line equipment and computer system technology are still developing fast and have become applicable at WWTPs. The use of on-line measurements for real time control is advantageous at most plants over 15.000 personal equivalent performing biological nutrient removal. Control strategies have demonstrated their efficiency at several Scandinavian wastewater treatment plants. Experience shows that the applied control strategies are efficient and robust for practical implementation, provide savings in energy and chemical consumption and decreases the nitrogen content in the effluent. Experience from a recirculating BNR plant using the STAR concept for advanced real time control is described. The on-line nutrient measurements and excitation of the processes through control strategies have improved the process understanding. Control has reduced the consumption of energy by about 30% and eliminated the need for external carbon addition, as well as improved the effluent quality of total nitrogen from the plant. The new measurements and data handling methods will make it possible to perform dynamic identification of activity in recirculating plants (Nielsen et.al., 1994), and hence give information as to which control strategies improve the biomass activity or favour desired cultures of micro-organisms.

Real time control of a combined sewer system using radar-measured precipitation - results of the pilot study

2003 ◽  
Vol 47 (7-8) ◽  
pp. 365-370
Author(s):  
A. Petruck ◽  
E. Holtmeier ◽  
A. Redder ◽  
B. Teichgräber
Keyword(s):  
Pilot Study ◽  
Real Time ◽  
Control Strategies ◽  
Real Time Control ◽  
Sewer System ◽  
Local Pollution ◽  
Time Control ◽  
Catchment Areas ◽  
Combined Sewer ◽  
Combined Sewer System

Emschergenossenschaft and Lippeverband have developed a method to use radar-measured precipitation as an input for a real-time control of a combined sewer system containing several overflow structures. Two real-time control strategies have been developed and tested, one is solely volume-based, the other is volume and pollution-based. The system has been implemented in a pilot study in Gelsenkirchen, Germany. During the project the system was optimised and is now in constant operation. It was found, that the volume of combined sewage overflow could be reduced by 5 per cent per year. This was also found in simulations carried out in similar catchment areas. Most of the potential of improvement can already be achieved by local pollution-based control strategies.

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