scholarly journals Integrated operation of sewer system and WWTP by simulation-based control of the WWTP inflow

2005 ◽  
Vol 52 (5) ◽  
pp. 195-203 ◽  
Author(s):  
K. Seggelke ◽  
K.-H. Rosenwinkel ◽  
P. A. Vanrolleghem ◽  
P. Krebs
Keyword(s):  
Standard Procedure ◽  
Dynamic Control ◽  
Systems Design ◽  
Actual State ◽  
Sewer System ◽  
Simulation Based ◽  
Integrated Operation ◽  
Wastewater Systems ◽  
On Line ◽  
Receiving Water

In recent years numerical modelling became a standard procedure to optimise urban wastewater systems design and operation by integration. For dynamic control of the wastewater teatment plant (WWTP) inflow, a model-based predictive concept is introduced aiming at improving the receiving water quality. An on-line simulator running parallel to the real WWTP operation reflects the actual state of operation and provides this model information to a prognosis tool which determines the best option for the WWTP inflow. The investigations showed that it is possible to reduce the NH4-N peak concentrations in the receiving water by dynamic WWTP inflow control based on predictive scenario analysis.

Integrated modelling as an analytical and optimisation tool for urban watershed management

2002 ◽  
Vol 46 (6-7) ◽  
pp. 141-150 ◽  
Author(s):  
V. Erbe ◽  
T. Frehmann ◽  
W.F. Geiger ◽  
P. Krebs ◽  
J. Londong ◽  
...  
Keyword(s):  
Standard Procedure ◽  
Treatment Plant ◽  
Systems Design ◽  
Integrated Approach ◽  
Integrated Modelling ◽  
State Variables ◽  
Upstream Direction ◽  
Wastewater Systems ◽  
Set Up ◽  
Receiving Water

In recent years numerical modelling has become a standard procedure to optimise urban wastewater systems design and operation. Since the models were developed for the subsystems independently, they did not support an integrated view to the operation of the sewer system, the wastewater treatment plant (WWTP) and the receiving water. After pointing out the benefits of an integrated approach and the possible synergy effects that may arise from analysing the interactions across the interfaces, three examples of modelling case studies carried out in Germany are introduced. With these examples we intend to demonstrate the potential of integrated models, though their development cannot be considered completed. They are set up with different combinations of self-developed and commercially available software. The aim is to analyse fluxes through the total wastewater system or to integrate pollution-based control in the upstream direction, that is e.g. managing the combined water retention tanks as a function of state variables in the WWTP or the receiving water. Furthermore the interface between the sewer and the WWTP can be optimised by predictive simulations such that the combined water flow can be maximised according to the time- and dynamics-dependent state of the treatment processes.

Predictive control of sewer systems by means of grey-box models

1996 ◽  
Vol 34 (3-4) ◽  
pp. 189-194
Author(s):  
Jacob Carstensen ◽  
Marinus K. Nielsen ◽  
Poul Harremoës
Keyword(s):  
Predictive Control ◽  
Treatment Plant ◽  
Sewer System ◽  
Sewer Systems ◽  
Box Models ◽  
On Line ◽  
Rain Events ◽  
Control Part ◽  
Receiving Water

Grey-box modelling is a new methodology which can be used for obtaining important information from on-line data. This information can be used in control for optimizing the performance of the sewer system as well as the treatment plant during rain events. The objective is to minimize the effect from discharges on the receiving water without increasing the risk of flooding. This is the concept used in the control part of the EUREKA-financed project MUST.

Systems analysis of urban wastewater systems – two systematic approaches to analyse a complex system

2005 ◽  
Vol 52 (12) ◽  
pp. 171-179 ◽  
Author(s):  
L. Benedetti ◽  
F. Blumensaat ◽  
G. Bönisch ◽  
G. Dirckx ◽  
N. Jardin ◽  
...  
Keyword(s):  
River Basin ◽  
Systems Analysis ◽  
Scale Dependency ◽  
Urban Wastewater ◽  
Critical Pathways ◽  
Capital Costs ◽  
River Stretch ◽  
Basin Scale ◽  
Wastewater Systems ◽  
Receiving Water

This work was aimed at performing an analysis of the integrated urban wastewater system (catchment area, sewer, WWTP, receiving water). It focused on analysing the substance fluxes going through the system to identify critical pathways of pollution, as well as assessing the effectiveness of energy consumption and operational/capital costs. Two different approaches were adopted in the study to analyse urban wastewater systems of diverse characteristics. In the first approach a wide ranged analysis of a system at river basin scale is applied. The Nete river basin in Belgium, a tributary of the Schelde, was analysed through the 29 sewer catchments constituting the basin. In the second approach a more detailed methodology was developed to separately analyse two urban wastewater systems situated within the Ruhr basin (Germany) on a river stretch scale. The paper mainly focuses on the description of the method applied. Only the most important results are presented. The main outcomes of these studies are: the identification of stressors on the receiving water bodies, an extensive benchmarking of wastewater systems, and the evidence of the scale dependency of results in such studies.

Towards a virtual work-bench for robotics training

Robotica ◽  
1996 ◽  
Vol 14 (5) ◽  
pp. 575-582
Author(s):  
Jiming Liu
Keyword(s):  
Virtual Work ◽  
Low Cost ◽  
Systems Design ◽  
Robotic Systems ◽  
Information Superhighway ◽  
Knowledge Space ◽  
Student Centered ◽  
Electronic Learning ◽  
Needed Information ◽  
On Line

SUMMARYLearning in the age of information superhighway necessitates a properly-developed efficient vehicle that is not only powerful in directing users to the needed information or to situate in a reality through virtual settings, but also controllable at the various comfortable paces. The goal of this project is to explore a new on-line medium for users to navigate at their own pace in the structured cyberspace—knowledge space composed of concepts, systems design, application-oriented case studies, up-to-date industrial news (trends and product review), and on-line robotic systems, and to use it as a robotics work-bench for conducting controllable experiments/simulations. Through such an electronic learning medium, users will be able to acquire a global outlook as well as an integrated understanding of modern robotics in a manner that is low-cost, time-and-place-free, and student-centered.

Design of Robust Approach for Failure Detection in Dynamic Control Systems

2013 ◽  
pp. 237-259
Author(s):  
Gomaa Zaki El-Far
Keyword(s):  
Nuclear Power ◽  
Dynamic Control ◽  
Control Process ◽  
Failure Detection ◽  
Global Optimum ◽  
Sampling Time ◽  
Nuclear Power Reactor ◽  
Control Actions ◽  
On Line ◽  
Simulation Results

This paper presents a robust instrument fault detection (IFD) scheme based on modified immune mechanism based evolutionary algorithm (MIMEA) that determines on line the optimal control actions, detects faults quickly in the control process, and reconfigures the controller structure. To ensure the capability of the proposed MIMEA, repeating cycles of crossover, mutation, and clonally selection are included through the sampling time. This increases the ability of the proposed algorithm to reach the global optimum performance and optimize the controller parameters through a few generations. A fault diagnosis logic system is created based on the proposed algorithm, nonlinear decision functions, and its derivatives with respect to time. Threshold limits are implied to improve the system dynamics and sensitivity of the IFD scheme to the faults. The proposed algorithm is able to reconfigure the control law safely in all the situations. The presented false alarm rates are also clearly indicated. To illustrate the performance of the proposed MIMEA, it is applied successfully to tune and optimize the controller parameters of the nonlinear nuclear power reactor such that a robust behavior is obtained. Simulation results show the effectiveness of the proposed IFD scheme based MIMEA in detecting and isolating the dynamic system faults.

Expert system for the on-line diagnosis of anaerobic wastewater treatment plants

2002 ◽  
Vol 45 (10) ◽  
pp. 195-200 ◽  
Author(s):  
A. Puñal ◽  
J. Rodríguez ◽  
E.F. Carrasco ◽  
E. Roca ◽  
J.M. Lema
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
The State ◽  
Control Action ◽  
Actual State ◽  
Flow Rates ◽  
Diagnosis System ◽  
Set Point ◽  
Anaerobic Wastewater Treatment ◽  
On Line

A diagnosis system for anaerobic wastewater treatment processes is presented. The system is able to recognise the state and trend of the operation and suggest the appropriate control action. The on-line variables measured were gas flow rate and composition (methane and carbon monoxide), feed and recycling flow rates, temperature and pH, while the manipulable inputs are feed, recycling and buffer-addition flow rates. The diagnosis system comprises a structured rule base, incorporating expert knowledge using fuzzy logic features. The structure of the system is based on the classification of information related to the process in three categories: i) the state of the process, ii) its trend and iii) the recommended set-point values for the inputs manipulated: feeding, buffer and recycling pumps. The system was applied to diagnose the operation of a 1.1 m3 hybrid UASB-UAF treating wastewater from a fibreboard production factory under different conditions (overload and underload), corresponding to some of the typical causes of destabilisation in anaerobic wastewater treatment plants. These situations require control action in order to maintain the stability and the treatment capacity of the reactor. The application of the system developed for the purpose of managing the situation proved to be reliable for supplying the actual state and trend of the process, as well as the adequate set point values to recover stable operation and/or to avoid further destabilisation.

scholarly journals Evaluation of the Effectiveness of Five Odor Reducing Agents for Sewer System Odors Using an On-Line Total Reduced Sulfur Analyzer

Sensors ◽  
2012 ◽  
Vol 12 (12) ◽  
pp. 16892-16906 ◽  
Author(s):  
Il Choi ◽  
Hyunjoo Lee ◽  
Joungdu Shin ◽  
Hyunook Kim
Keyword(s):  
Reducing Agents ◽  
Sewer System ◽  
On Line ◽  
Total Reduced Sulfur ◽  
Reduced Sulfur
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