Monitoring, controlling and
optimising operations
EDS® – Water
Management
The training equipment
The EDS® – Water Management is a modular training equipment which simulates
the core processes of water and wastewater treatment plants.
EDS with all four systems
Festo Didactic
11/2013
Monitoring, controlling and optimising operations
Introduction to the learning module
“Monitoring, controlling and optimising operations”
Control technology is getting more and more important in all areas, because its use can help to reduce the
consumption of energy and resources. In an effort to make the operation of water or wastewater treatment
plants more efficient, individual steps must be planned and sequences must be understood and doublechecked. Changing and maintaining fill levels are common daily tasks. These processes usually take place in
the background or within areas of a machine or system that is not immediately visible. Nevertheless,
monitoring process quantities such as fill level, pressure and flow rate offers a great deal of potential.
Economy, improved quality and more safety for personnel and machinery are only a few of the aims which
can be achieved by consistent process monitoring. SCADA (supervisory control and data acquisition)
systems are used for collecting the data. Yet still the analysis is often performed manually. Water utilities
are facing the challenge of efficiently extracting useful information from data.
In this learning module closed-loop control is practised. Different operating conditions of systems can be
tried out without endangering persons, material or environment.
The EDS® – Water Management provides a wide variety of sensors to control the system:
Chlorine
Ultrasonic
Flow sensor
sensor
sensor
(impeller)
Float switch
Manometer
Dissolved oxygen sensor
Capacitive
proximity sensor
Flow sensor magneto-
Pressure
inductive
sensor
Controller
Sensors at the EDS
Closed-loop control of flow, fill-level or oxygen concentration can be realised by automatically regulating
different pumps, valves or the air blower.
2
© Festo Didactic GmbH & Co. KG
Monitoring, controlling and optimising operations
Exercises: Volumetric flow control and drain control
Problem description
From the operational point of view, the throttle device of the rain overflow basin plays a central role.
Blockage of the throttle device results in excessive contamination of watercourses as a result of premature
discharge. If the throttled flow substantially exceeds the design flow, hydraulic overload of the wastewater
treatment plant can result in reduced purification capacity or even sludge outflow from the secondary
sedimentation basin.
Layout
The layout for the following two exercises is the same.
•
For exercise 3.2.1 “Flow control” the red circuit is used.
•
For exercise 3.2.2 “Drain control” the blue circuit is used.
Flow and drain are controlled via the proportional media valve V303. The valve’s pop-up window works and
looks like the control menu of the pump.
© Festo Didactic GmbH & Co. KG
3
Monitoring, controlling and optimising operations
3.2.2 Drain Control
Learning outcomes
With this exercise you can explore “good settings” for the drain control using FluidLab® Water Management
software to operate the proportional media valve.
Tasks
1. Preparation of the Wastewater Transport System (blue circuit)
Task
Completed
Observation
Piping assembled - the blue circuit is used - leak proof
Pump connected and tested
Flow sensor connected and tested
Electrical wiring and connecting cables connected
Open FluidLab® Water Management, choose
“Wastewater Transport”
V301, V302 and V310 closed
V303 and V305 open
Start P501 digitally
Open V101 carefully
Set water level in B301 constant below overflow edge
2. Select each of the values listed below and document your observations.
Settings
Observation
Setpoint w
Amplification
(physical)
(kp)
1
0.8 l/min
0.1
4 sec.
100% open
Quick but not stable
2
0.8 l/min
0.1
5 sec.
100% open
Getting better
3
0.6 l/min
0.1
5 sec.
100% open
Still better
No.
Reset time Tn
Disturbance variable z,
valve V305
4
5
Training notes
Volume flow is best below 0.8 l/min.
4
© Festo Didactic GmbH & Co. KG
Monitoring, controlling and optimising operations
Correlating the exercises with the EDS® – Water Management Systems
The table below shows which of the EDS Systems can be used for which exercise. The systems concerned
are marked with “X”. If there is no “X” in a line, the respective exercise is knowledge driven and therefore
none of the EDS systems are required. “(X)” means that it is possible to conduct the exercise with this
system. However the systems marked with “X” are to be preferred.
Correlation of the exercises with the EDS® – Water Management Systems
WPUR
WSUP
WWTRA
WWTRE
X
X
Workbook Monitoring, controlling and optimising operations
2. Closed loop control technology: Pump
2.2.1
Controlling the fill level using a two-step controller
X
2.2.2
Controlling the fill level using a continuous controller
X
2.2.3
Flow control using a proportional-integral controller
X
3. Closed loop control technology: Proportional media valve
3.2.1
Volumetric Flow Control
X
3.2.2
Drain Control
X
4. Closed loop control technology: Aeration
4.2.1
Controlling the oxygen concentration using a two-step controller
X
4.2.2
Controlling the oxygen concentration using a continuous controller
X
W-PUR: Water Purification System
W-SUP: Water Supply System
WW-TRA: Wastewater Transport System
WW-TRE: Wastewater Treatment System
© Festo Didactic GmbH & Co. KG
5
Festo Didactic GmbH & Co. KG
Rechbergstraße 3
73770 Denkendorf
Germany
Internet: www.festo-didactic.com
E-mail: did@de.festo.com