Real-time control of combined surface water quantity and quality: polder flushing

2010 ◽  
Vol 61 (4) ◽  
pp. 869-878 ◽  
Author(s):  
M. Xu ◽  
P. J. van Overloop ◽  
N. C. van de Giesen ◽  
G. S. Stelling
Keyword(s):  
Water Quality ◽  
Real Time ◽  
Water Quality Management ◽  
Water System ◽  
Open Water ◽  
Estimation Procedure ◽  
Test Case ◽  
Real Time Control ◽  
Integral Control ◽  
Time Control

In open water systems, keeping both water depths and water quality at specified values is critical for maintaining a ‘healthy’ water system. Many systems still require manual operation, at least for water quality management. When applying real-time control, both quantity and quality standards need to be met. In this paper, an artificial polder flushing case is studied. Model Predictive Control (MPC) is developed to control the system. In addition to MPC, a ‘forward estimation’ procedure is used to acquire water quality predictions for the simplified model used in MPC optimization. In order to illustrate the advantages of MPC, classical control [Proportional-Integral control (PI)] has been developed for comparison in the test case. The results show that both algorithms are able to control the polder flushing process, but MPC is more efficient in functionality and control flexibility.

Model reduction through boundary relocation to facilitate real-time control optimisation in the integrated urban wastewater system

2002 ◽  
Vol 45 (4-5) ◽  
pp. 373-381 ◽  
Author(s):  
J. Meirlaen ◽  
P.A. Vanrolleghem
Keyword(s):  
Water Quality ◽  
Model Reduction ◽  
Real Time ◽  
Treatment Plant ◽  
Model Complexity ◽  
Urban Wastewater ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
The Impact

Real time control is one of the possibilities to minimise the impact of the integrated urban wastewater system (sewer system and treatment plant) on the receiving water quality. Integrated control uses information about the river state to act in the sewer system or in treatment plant. In order to test and tune these integrated controllers, a simplified integrated model is needed. Even with these simplified models, the simulation times may be too long and further model reduction is needed. In this paper, dependency-structure based model reduction is proposed as a technique to further reduce model complexity. Three steps are proposed: relocation of the upstream system boundaries to just upstream of the first control point, relocation of the downstream boundaries to just downstream of the last measurement point, and third, a further model simplification based on an analysis of the sensitivity of the control actions on submodel elimination. The effect of applying the different reduction approaches on the control strategy and on the resulting river water quality is discussed on the basis of a case study of the catchment of Tielt.

Real time control of the integrated urban wastewater system using simultaneously simulating surrogate models

2002 ◽  
Vol 45 (3) ◽  
pp. 109-116 ◽  
Author(s):  
J. Meirlaen ◽  
J. Van Assel ◽  
P. A. Vanrolleghem
Keyword(s):  
Water Quality ◽  
Real Time ◽  
River Water ◽  
Control Strategy ◽  
Treatment Plant ◽  
River Water Quality ◽  
Urban Wastewater ◽  
Real Time Control ◽  
Time Control

The urban wastewater system (sewer and treatment plant) has a major impact on the river water quality of urban streams. To minimise this impact, real time control is a valuable option. Since the ultimate goal of any control strategy is to optimise the quality of the river system, it is useful to take pollutant immissions into account when determining the control strategy and/or the setpoints of the controller. However, a simultaneously simulating model of the complete system is needed in order to allow design and evaluation of such control strategies. In this work an integrated model of the urban wastewater system is created. This has been accomplished by implementing surrogate models of the three subsystems within a single software platform. The coupled submodels are subsequently used in a semi-hypothetical case study to optimise the resulting river water quality. An ammonia sensor in the river has been used to control the amount of water treated biologically in the treatment plant. It was shown that this integrated control could lower the peak ammonia concentration in the part of the river downstream of the treatment plant. Hence, a proof of principle has been given that the use of measurements in the river to perform control actions in the sewer system and the treatment plant is a promising option.

Impact-based integrated real-time control for improvement of the Dommel River water quality

2013 ◽  
Vol 10 (5) ◽  
pp. 312-329 ◽  
Author(s):  
J. G. Langeveld ◽  
L. Benedetti ◽  
J. J. M. de Klein ◽  
I. Nopens ◽  
Y. Amerlinck ◽  
...  
Keyword(s):  
Water Quality ◽  
Real Time ◽  
River Water ◽  
River Water Quality ◽  
Real Time Control ◽  
Time Control

Turbidity Informed Real-Time Control of a Dry Extended Detention Basin: A Case Study

2022 ◽  
Author(s):  
Aaron Akin ◽  
Jon Hathaway ◽  
Anahita Khojandi
Keyword(s):  
Water Quality ◽  
Real Time ◽  
Real Time Control ◽  
Detention Basin ◽  
Time Control ◽  
Long Term Changes ◽  
Detention Basins ◽  
Rainfall Patterns

Dry extended detention basins are static stormwater infrastructure, unable to adapt to shifts in water quality caused by urbanization in their source watersheds or long-term changes in rainfall patterns. As...

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.

Application of stormwater mass–volume curve prediction for water quality-based real-time control in sewer systems

2019 ◽  
Vol 16 (1) ◽  
pp. 11-20
Author(s):  
Duy Khiem Ly ◽  
Thibaud Maruéjouls ◽  
Guillaume Binet ◽  
Jean-Luc Bertrand-Krajewski
Keyword(s):  
Water Quality ◽  
Real Time ◽  
Real Time Control ◽  
Time Control ◽  
Sewer Systems ◽  
Volume Curve ◽  
Mass Volume
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