Potential of turbidity monitoring for real time control of pollutant discharge in sewers during rainfall events

2009 ◽  
Vol 59 (8) ◽  
pp. 1471-1478 ◽  
Author(s):  
C. Lacour ◽  
C. Joannis ◽  
M.-C. Gromaire ◽  
G. Chebbo
Keyword(s):  
Real Time ◽  
Simple Relation ◽  
Flow Dynamics ◽  
Storm Event ◽  
Real Time Control ◽  
Event Scale ◽  
Hydraulic Flow ◽  
Time Control ◽  
Wet Weather ◽  
Total Event

Turbidity sensors can be used to continuously monitor the evolution of pollutant mass discharge. For two sites within the Paris combined sewer system, continuous turbidity, conductivity and flow data were recorded at one-minute time intervals over a one-year period. This paper is intended to highlight the variability in turbidity dynamics during wet weather. For each storm event, turbidity response aspects were analysed through different classifications. The correlation between classification and common parameters, such as the antecedent dry weather period, total event volume per impervious hectare and both the mean and maximum hydraulic flow for each event, was also studied. Moreover, the dynamics of flow and turbidity signals were compared at the event scale. No simple relation between turbidity responses, hydraulic flow dynamics and the chosen parameters was derived from this effort. Knowledge of turbidity dynamics could therefore potentially improve wet weather management, especially when using pollution-based real-time control (P-RTC) since turbidity contains information not included in hydraulic flow dynamics and not readily predictable from such dynamics.

Temperature and conductivity as control parameters for pollution-based real-time control

2006 ◽  
Vol 54 (11-12) ◽  
pp. 257-263 ◽  
Author(s):  
R.P.S. Schilperoort ◽  
G. Gruber ◽  
C.M.L. Flamink ◽  
F.H.L.R. Clemens ◽  
J.H.J.M. van der Graaf
Keyword(s):  
Real Time ◽  
Monitoring Network ◽  
Storm Event ◽  
Real Time Control ◽  
Normal Behaviour ◽  
Time Control ◽  
Wastewater Systems ◽  
Typical Behaviour ◽  
Good Relation ◽  
Set Up

Most sewer system performance indicators are not easily measurable online at high frequencies in wastewater systems, which hampers real-time control with those parameters. Instead of using a constituent of wastewater, an alternative could be to use characteristics of wastewater that are relatively easily measurable in sewer systems and could serve as indicator parameters for the dilution process of wastewater. This paper focuses on the possibility to use the parameters of temperature and conductivity. It shows a good relation of temperature and conductivity with the dilution of DWF (dry weather flow) during WWF (wet weather flow) a monitoring station in Graz, Austria, as an example. The simultaneous monitoring of both parameters leads to valuable back-up information in case one parameter (temperature) shows no reaction to a storm event. However, for various reasons, anomalies occur in the typical behaviour of both parameters. The frequency and extent of these anomalies will determine the usefulness of the proposed parameters in a system for pollution-based real-time control. Both the normal behaviour and the anomalies will be studied further by means of trend and correlation analyses of data to be obtained from a monitoring network for the parameters of interest that is currently being set up in the Netherlands.

Pollution based real time control of wastewater systems

2002 ◽  
Vol 45 (3) ◽  
pp. 219-228 ◽  
Author(s):  
L.P. Risholt ◽  
W. Schilling ◽  
V. Erbe ◽  
J. Alex
Keyword(s):  
Real Time ◽  
Chemical Precipitation ◽  
Actual State ◽  
Real Time Control ◽  
Design Load ◽  
Time Control ◽  
Pollutant Concentrations ◽  
Wastewater Systems ◽  
Receiving Waters ◽  
Wet Weather

Wastewater systems are traditionally built as static systems to handle a design load. The real load varies, though, and hardly ever equals the design load. This implies that wastewater systems hardly ever operate in an optimum way, especially during wet weather. Real time control (RTC) of regulators can improve the operation by better fit of the system to the actual state and load. RTC based on pollutant concentrations together with hydraulic conditions (pollution based real time control, PBRTC) is investigated in this paper to assess the potential pollutant load reduction on receiving waters at wet weather without expansion of transport or storage capacity. Both CSOs and WWTP effluents contribute to the pollutant discharges to receiving waters and both are considered. Three cases are studied to assess the potential benefit of PBRTC. Giving priority to the most polluted wastewater for treatment and storage in branched interceptor systems can reduce CSO discharge loads by more than 20%. Biological WWTPs and especially activated sludge plants are more complex and less stable than chemical precipitation plants during and after high pollutant and hydraulic load. Biological plants can hence profit more from PBRTC than chemical precipitation plants. Receiving waters that are sensitive to acute effects caused by intermittent discharges can benefit more from PBRTC than receiving waters with problems connected to long-term accumulation of pollution.

Aeration tank settling and real time control as a tool to improve the hydraulic capacity and treatment efficiency during wet weather: results from 7 years' full-scale operational data

2013 ◽  
Vol 67 (10) ◽  
pp. 2169-2176 ◽  
Author(s):  
A. K. Sharma ◽  
T. Guildal ◽  
H. A. R. Thomsen ◽  
P. S. Mikkelsen ◽  
B. N. Jacobsen
Keyword(s):  
Real Time ◽  
Treatment Plant ◽  
Aeration Tank ◽  
Treatment Efficiency ◽  
Real Time Control ◽  
Design Capacity ◽  
Time Control ◽  
Wet Weather ◽  
Operational Data ◽  
Tank Settling

This paper investigates the aeration tank settling (ATS) operation in combination with real time control (RTC) as a tool for increasing the hydraulic capacity and improving the treatment efficiency of a wastewater treatment plant (WWTP) during wet weather flows. Results from 7 years' full-scale operational data at the Avedøre WWTP, Denmark, show that ATS operation in combination with RTC increases the hydraulic capacity of the treatment plant with up to 150 and 67% of the design capacity during winter and summer respectively. Compared to the conventional wet weather operation, the ATS in combination with RTC operation resulted in lower effluent concentrations for total phosphate (40–50%), suspended solids (30–60%) and chemical oxygen demand (30–50%), whereas no significant effect was observed on total nitrogen. Apart from the reduced effluent concentrations, the RTC resulted in economic savings in the form of reduced costs for electricity and green taxes. However, in very few cases the ATS operation in combination with RTC was not able to handle design capacity, and some overflows occurred at flows below the design capacity. The frequency of these overflows may increase in the future due to increased rain intensity resulting in shorter prediction time available for ATS.

Study on real time control of non-point pollutants discharged from urban areas during a storm event

2001 ◽  
Vol 44 (7) ◽  
pp. 17-22
Author(s):  
K. Yamada ◽  
T.-S. Kim ◽  
K. Nakamura ◽  
J. Nomura
Keyword(s):  
Real Time ◽  
Water Use ◽  
Urban Areas ◽  
Flood Control ◽  
Storm Event ◽  
Real Time Control ◽  
Catchment Basin ◽  
Water Storage Tank ◽  
Time Control ◽  
Pollutant Reduction

In this research, we installed the storm water storage tank, which has three functions: pollutant control, flood control and water use, to the end pipe of a separate system. We examined the effect of real time control (RTC) introduction with the scenario selection in the study area in the catchment basin, which has measured data. As a result, a latter period centering-type case is satisfied with the pollutant reduction by the RTC and also at the water use tank, the best control settles COD concentration at about 0.45 mg/l. It was clarified how to use a RTC method as a measure of the discharge problem from an urban area during a storm event.

Early Wins from a Wet Weather SCADA System: Better Performance at Remote, Real Time Control Facilities

2017 ◽  
Vol 2017 (10) ◽  
pp. 2838-2850
Author(s):  
Melissa Gatterdam ◽  
Robert Kneip ◽  
Reese Johnson ◽  
Shirish Agarwal
Keyword(s):  
Real Time ◽  
Real Time Control ◽  
Time Control ◽  
Scada System ◽  
Wet Weather

Practical Perspective on Real-Time Control

2004 ◽  
Vol 39 (4) ◽  
pp. 466-478 ◽  
Author(s):  
Hubert Colas ◽  
Martin Pleau ◽  
Jean Lamarre ◽  
Geneviève Pelletier ◽  
Pierre Lavallée
Keyword(s):  
Control Systems ◽  
Real Time ◽  
Case Studies ◽  
Environmental Regulation ◽  
Real Time Control ◽  
Control Applications ◽  
Engineering Community ◽  
Time Control ◽  
Wastewater Systems ◽  
Wet Weather

Abstract Environmental regulation is evolving and will require billions of dollars in investments to improve the operation of wastewater systems and to control the wet-weather pollution. The optimization of existing facilities before building new ones has been emphasized as a preferred strategy and, consequently, municipalities are learning that they can avoid costly and unnecessary capital improvement projects. Real-time control is a technology that serves to optimize the operation of wastewater systems. However, it is still not widely used, although it is gaining acceptance in the municipal engineering community. More and more municipalities are evaluating the potential of real-time control for their systems. Nevertheless, there are relatively few examples of actual real-time control applications or publications on this topic. Many issues still need to be addressed, ranging from the evaluation of real-time control to its implementation. Some of the criteria that favour the implementation of real-time control systems are presented, including safety, reliability, adaptability and flexibility, and such a presentation is complemented by case studies of operational real-time control systems illustrating these characteristics.

Start-Up, Operation and Performance of an Optimized Real time Control System for Wet Weather Pollution Control

2000 ◽  
Vol 2000 (4) ◽  
pp. 36-49
Author(s):  
Pierre Lavallée ◽  
Richard Bonin ◽  
Bruno Roy ◽  
Genevieve Pelletier ◽  
Martin Pleau
Keyword(s):  
Control System ◽  
Real Time ◽  
Pollution Control ◽  
Real Time Control ◽  
Time Control ◽  
Start Up ◽  
Wet Weather ◽  
And Performance

A Real Time Control Architecture for Continuously Managing Patients in a Care Unit

1995 ◽  
Vol 34 (05) ◽  
pp. 475-488
Author(s):  
B. Seroussi ◽  
J. F. Boisvieux ◽  
V. Morice
Keyword(s):  
Real Time ◽  
Linear Time ◽  
Treatment Plan ◽  
Control Architecture ◽  
Real Time Control ◽  
Time Representation ◽  
Time Control ◽  
Continuous Support ◽  
Definition Of ◽  
Computerized System

Abstract:The monitoring and treatment of patients in a care unit is a complex task in which even the most experienced clinicians can make errors. A hemato-oncology department in which patients undergo chemotherapy asked for a computerized system able to provide intelligent and continuous support in this task. One issue in building such a system is the definition of a control architecture able to manage, in real time, a treatment plan containing prescriptions and protocols in which temporal constraints are expressed in various ways, that is, which supervises the treatment, including controlling the timely execution of prescriptions and suggesting modifications to the plan according to the patient’s evolving condition. The system to solve these issues, called SEPIA, has to manage the dynamic, processes involved in patient care. Its role is to generate, in real time, commands for the patient’s care (execution of tests, administration of drugs) from a plan, and to monitor the patient’s state so that it may propose actions updating the plan. The necessity of an explicit time representation is shown. We propose using a linear time structure towards the past, with precise and absolute dates, open towards the future, and with imprecise and relative dates. Temporal relative scales are introduced to facilitate knowledge representation and access.

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