INTEGRAL CONTROL REQUIREMENTS FOR SEWERAGE SYSTEMS

1994 ◽  
Vol 30 (1) ◽  
pp. 131-138
Author(s):  
Andrea G. Capodaglio
Keyword(s):  
Real Time ◽  
Sewage Treatment ◽  
Operating Conditions ◽  
Ideal Condition ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Integral Control ◽  
Time Control ◽  
Combined Sewer ◽  
Harmful Effects

Sewerage systems and sewage treatment plants are often planned, designed and operated as totally separate entities. As a result, sewage treatment efficiency is subject to considerable variability, depending both on general hydrologic conditions in the urban watershed (wet versus dry periods), and on specific “instantaneous” operating conditions. It has been postulated that the integration of design and operation in urban drainage and wastewater treatment could allow minimization of the harmful effects of discharges from treatment plants, combined sewer overflows and surface runoff. This “ideal condition” can be achieved through the introduction of so-called “Real-Time Control” technology in sewerage collection and treatment operations. This paper examines the requirements of a hypothetical integrated sewer flow and sewage treatment model, the mathematical tools used to design and operate Real-Time Control systems, and the issues emerging from an integration of the conveyance and disposal aspects of the sewerage cycle.

Transfer Function Modelling of Urban Drainage Systems, and Potential Uses in Real-Time Control Applications

1994 ◽  
Vol 29 (1-2) ◽  
pp. 409-417 ◽  
Author(s):  
Andrea G. Capodaglio
Keyword(s):  
Transfer Function ◽  
Real Time ◽  
Sewage Treatment ◽  
Operating Conditions ◽  
Urban Drainage ◽  
Real Time Control ◽  
Control Applications ◽  
Time Control ◽  
Function Modelling ◽  
Transfer Function Modelling

According to the present state-of-the-art, sewerage systems, sewage treatment plants and their subsequent improvements are often planned and designed as totally separate entities, each subject to a specific set of performance objectives. As a result, sewage treatment efficiency is subject to considerable variability, depending both on general hydrologic conditions in the urban watershed (wet versus dry periods), and on specific “instantaneous” operating conditions. It has been postulated that the integration of urban drainage and wastewater treatment design and operation could allow minimization of the harmful effects of discharges from treatment plants, overflows and surface water runoff. This “ideal condition” can be achieved through the introduction of so-called “real-time control” technology in sewerage collection and treatment operations. To be a feasible goal, this technology poses the demand for more powerful simulation models of either aspect of the system - or, ideally, of a unified sewer-and-treatment plant model - than most of those currently available. This paper examines the requirements of rainfall/runoff transformation and sewer flow models with respect to real-time control applications, and focuses on the methodology of stochastic, transfer function modelling, reporting application examples. Modalities and limitations of the extraction of information from the models thus derived are also analyzed.

scholarly journals Real Time Control of Combined Sewer Overflows: the SWIFT Model

1999 ◽  
Author(s):  
Alain Mailhot ◽  
◽  
Andree Bilodeau ◽  
Claude Blanchette ◽  
Christiane Marcoux ◽  
...  
Keyword(s):  
Real Time ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Time Control ◽  
Combined Sewer ◽  
Sewer Overflows

Real Time Control within a Combined Sewer System: Comparison of Practical and Theoretical Results

1993 ◽  
Vol 27 (5-6) ◽  
pp. 123-132 ◽  
Author(s):  
Michael. Weyand
Keyword(s):  
Real Time ◽  
Control Strategies ◽  
Practical Investigations ◽  
Water Runoff ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Model Calculations ◽  
Detention Tank ◽  
Time Control ◽  
Combined Sewer

Application of real time control systems within sewer networks is one of different possible measures taken against the problems with storm water runoff and combined sewer overflows (CSO) in urbanized areas. Practical investigations concerning the effect of this alternative way to reduce CSO have been made during four years in the sewer network of the community Ense-Bremen (near Dortmund). An implemented simple control strategy manages the flow and storage events aiming at an even degree of storage capacity at any detention tank and at any time. The comparison with model calculations, reveals that there are differences between both results especially those concerning the basin out-flows. These differences are mainly caused by the constraints of practical operation. Therefore it is necessary to develop control strategies considering these facts within its practical course.

Mathematical modeling of sewers under surcharge for real time control of combined sewer overflows

Urban Water ◽  
2001 ◽  
Vol 3 (4) ◽  
pp. 241-252 ◽  
Author(s):  
Sophie Duchesne ◽  
Alain Mailhot ◽  
Emeric Dequidt ◽  
Jean-Pierre Villeneuve
Keyword(s):  
Mathematical Modeling ◽  
Real Time ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Time Control ◽  
Combined Sewer ◽  
Sewer Overflows

Real-Time Control of Combined Sewer Overflows in Hamilton-Wentworth Region

1997 ◽  
Vol 32 (1) ◽  
pp. 155-168 ◽  
Author(s):  
M. Stirrup ◽  
Z. Vitasovic ◽  
E. Strand
Keyword(s):  
Control System ◽  
Real Time ◽  
Treatment Plant ◽  
Simulation Models ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Hydraulic Simulation ◽  
Time Control ◽  
Combined Sewer ◽  
Sewer Overflows

Abstract The Regional Municipality of Hamilton-Wentworth operates and maintains a large combined sewer system in the Great Lakes basin. During dry weather and small storm events, two large interceptor sewers convey all sanitary and storm flows to the Woodward Avenue wastewater treatment plant. Larger rainfall events, specifically high intensity summer thunderstorms, generate flows which exceed the design capacity of the sanitary interceptors and result in combined sewer overflows to Hamilton Harbour and Cootes Paradise, which ultimately discharge to Lake Ontario. The Region is implementing a comprehensive program for reducing the pollution caused by these overflows. This program includes the construction of several off-line detention storage facilities and the implementation of a real-time control system for combined sewer overflow reduction. Real-time control will enable maximum utilization of the storage available within the combined sewer network and help reduce the frequency and volume of combined sewer overflows. New hydrologic and hydraulic simulation models have been specially developed for this project to help identify, test and implement optimal real-time control strategies. This paper discusses some of the more important aspects related to the design and implementation of the Region’s real-time control system, and focuses mainly on the development of these hydrologic and hydraulic simulation models.

How climate proof is real-time control with regard to combined sewer overflows?

2017 ◽  
Vol 15 (6) ◽  
pp. 544-551 ◽  
Author(s):  
G. Dirckx ◽  
H. Korving ◽  
J. Bessembinder ◽  
M. Weemaes
Keyword(s):  
Real Time ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Time Control ◽  
Combined Sewer ◽  
Sewer Overflows

Minimizing Combined Sewer Overflows in Real-Time Control Applications

1996 ◽  
Vol 31 (4) ◽  
pp. 775-786 ◽  
Author(s):  
Martin Pleau ◽  
François Methot ◽  
Andrée Moïra Lebrun ◽  
Hubert Colas
Keyword(s):  
Real Time ◽  
Problem Definition ◽  
State Variables ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Dynamic Constraints ◽  
Time Control ◽  
Combined Sewer ◽  
Unknown Disturbances ◽  
Sewer Overflows

Abstract An approach to design and operate real-time control system for combined sewer overflows is proposed. The methodology is based on nonlinear programming with the peculiarity that all the constraints are linear. The problem definition guarantees a non-null optimization space while preserving the physical and dynamical constraints of the state variables. The nonlinear cost function allows standard control objectives to be met and simulation of the behavior associated with storage facilities and actuators. The linear flow dynamic constraints are defined to simulate flow attenuation as well as to reject unknown disturbances.

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