Transcript Excursie rioolwaterzuivering Eindhoven

Drs. JPM van de Graaf
Consultant waterquality/ecology
Bosscheweg 56
5283 WB Boxtel
Postbus 10.001
5280 DA Boxtel
+31411618248
[email protected]
Workshop on Online Surface
Water Monitoring systems
Advantages and Disadvantages of
Online Monitoring Systems
8-7-2013
Advantages and Disadvantages of Online
Monitoring Systems
Content
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Waterboards
Monitoring surface water
– Operational monitoring
– Online monitoring
– WFD
Online monitoring
– Better insights
– Effect CSO
– modeling
Measurement conditions
Location of online sensors
People with know-how
Cost
Thank you for your inventation
12-12-2011
Study visit Holland Turkish delegation for Twinning project WFD
monitoring at Waterboard the Dommel.
Where you there?
I organised a demonstration
on biological monitoring;
sampling and lab analyses
at Waterboard the Dommel.
Demonstration in the field
Presentation at office Waterboard de Dommel
Macrofauna at Lab
26 Waterboards in the Netherlands
750 years of water governance
10.000 employees
€ 2 billion/yr
self finance
self governance
Responsible for waterquantity and waterquality
• Safety living and working area
• Prevent waterpollution
• Cleaning waste water (8 sewage treatment plants)
Scale The Netherlands vs Turkey
Waterboard De Dommel
Works of the waterboard
Dry feet
agriculture
Wastewater treatment
policy
Clean water
Monitoring
Monitoring surface water
Our efforts
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Routine monitoring (e.g. monthly)
On-line monitoring (O2,T, Conductivity, NH4-N, flow)
(Aquatic) ecological monitoring (e.g.1x/yr)
Automatic sampling stations
Field work
Routine monitoring
(Fys/chem monitoring) locations:
1/month
Measurement locations
Operational measurements
Advantage:
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Trend analysis for long term purposes
1980 – 2013; monthly
All parameters
Disadvantage
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Large gap between data (sampling monthly)
Transport, cost
Takes long to receive data (field – lab – data analysis)
Monitoring surface water
Online
Monitoring: 24/7
Online measurements:
Advantage:
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Short term trend analysis
Quick data collecting
Disadvantage
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Few locations
Few parameters
Big distance between sensors
Monitoring surface water
WFD: From goals to measures
How online monitoring helps achieving WFD objectives
Measures
watersystem
Species
Good
Improve WWTP
online monitoring
River restoration
Advice to improve
water quality
It is a way to monitor water quality. It provides insight into your water system.
Bad
Online monitoring
Better insights
-O2
2012
2012
Online:
- 24/7
- Whole year data
- Pikes
- Strong declines
Operational monitoring:
- 1/month
- Few data
Advantage:
Continuous measurements
Detailed data
Beter insights
Better advices
Better WFD score
Online monitoring
Advantage: continuous measurements leads to action
When we measure strong oxygen drops
we redirect water to protect WFD water
bodies
City: Eindhoven
Weir
Online Oxygen measurement
In case of:
- Pollution
- Heavy sewer overflow
- Drought
Online monitoring
Monitoring Eindhoven city - surface water Effect combined sewer overflows (CSO) and Waste Water Treatment Plant (WWTP)
Kerkhoef
Advantage:
Very specific
information about
effect CSO and
waste water
(overflow = O2
reduction, NH4
increase)
Sampling station CSO
WWTP
4
Sampling station river
Online Disolved Oxygen measurement
On line Flow measurement
3
CSO
City of Eindhoven
Online NH4, T, pH, cond. & turb.)
2
WWTP
WWTP
1
Tongelreep
Dommel
Belgium
Kleine Dommel
Online monitoring
Online O2 monitoring and sewer overflows
CSO event, summer 2007
- Dommel (up- and downstream of City of Eindhoven)
Example 1
DO mg/l
Fish Act standard
MTR
O2 drops to 1 mg/l !!
Duration: 1day
N conc.
Rainfall : about 20 mm /17 hr
Dommel
Flow Dommel : 2 m3/s
Recovery period
Online O2 monitoring and sewer overflows
Advantage:
Knowlegde about the
sensitivity of your
watersystem
sewer overflow
Recovery period
Standard 6 mg/l O2
Example 2
O2 drops to 0,1 mg/l !!
With monthly lab
analyzes you will never
find this brief anoxic
conditions.
Online monitoring
Modeling waterquality with online monitoringdata
Online data
O2/Temp
Dommel (Hooijdonkse molen)
35
Temperatuur oC
Zuurstof mg/l
30
Zuurstof verzadiging mg/l
25
20
15
10
5
0
3-dec-09
22-jan-10
13-mrt-10
2-mei-10
21-jun-10
10-aug-10
29-sep-10
18-nov-10
We use online data to calibrate water
quality models
Kleine Dommel (Collse Watermolen)
30
Temperatuur oC
Zuurstof mg/l
25
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Zuurstof verzadiging mg/l
20
15
10
5
0
13-mrt-10
2-mei-10
21-jun-10
10-aug-10
29-sep-10
Tongelreep (Aalst)
Checking based on knowledge of the system
Comparing model and measurements
Result: model and measurements match very well
18-nov-10
Temperatuur oC
Zuurstof mg/l
30
Zuurstof verzadiging mg/l
25
20
15
10
5
0
26-jun-09 15-aug-09
4-okt-09
23-nov-09
12-jan-10
3-mrt-10
22-apr-10
CSO
11-jun-10
31-jul-10
19-sep-10
8-nov-10
Oxygen measurement
Online monitoring
Modeling waterquality with online monitoringdata
Build a Water Quality Model with online
monitoring data:
– Link WWTP and CSO’s to chemical conditions in receiving
waters
– Simulate Oxygen, Ammonium etc
– Identify vulnerable areas;
– evaluate measurement scenarios
Measurement conditions: differences
winter vs summer
No cleaning system
Winter:
- Temperature water can drop to 1 °C
(freezing of materials)
- Less maintenance
Summer:
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Automatic cleaning system
Temperature water can reach >20 °C
Rubbish and lumber can block sensor
(specially during river maintenance)
Fouling algae specially in summertime
Measurement conditions
Not all collected online data is usefull
Loss of data %
Cause:
- Power break
- Lumber
- Fouling
- Drift of sensor  drift data
- No water (drought)
- Fabric maintenance
- Cleaning procedure
Sensor A
Sensor B
Sensor C
Sensor D
Sensor E
Sensor F
Sensor G
Location of online sensors
Think before acting
Think carefully about where you place the sensor:
- Not mobile
- It creates obstacles in river
- You need power on location or solar powerd devices in remote areas
- Vandalism can destroy precious equipment (or theft)
Current method
“mobile”
Sensor on solar power
Immobile sensor
Power and
Data transfer
O2 and flow sensor
Location under a highwaybridge
O2/temp, online sensor
Very robust
Location of online systems
Think before acting
In case of normal sampling you don’t have to think about vandalism, land
ownership, obstacles, power, waterlevel, etc, etc, etc
power
Vandalism proof
NH4
online
sensor
Ground: waterboard (or
agreement with farmer)
test
setup
Egalize ground
supply hose / water level
People with know-how
Online technology is a relatively new disciple
Who is cappable to get data
from field to office?
How do you guarantee this
knowledge for the long term?
Consultant is installing sensors
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Data from Field →online → Office
Using telemetry hardware/software)
Consultants and contractors or employees?
Calibrating online sensor
- Calibrating your device: which method
tells the truth?
- Cleaning and maintenance takes skills
- When is fouling influecing your data?
Question for managers: hiring consultants or educate employees?
Cost of online monitoring
Online monitoring: disadvantage or advantage?
Total cost of first year online O2 monitoring
Purchase:
- System (supplier)
- Installation materials
- Installation cost (contractor)
- Hours employees (labor costs)
Compare these costs with laboratory costs
- Field sampling, transport
- Labanalysis
Disadvantage or advantage?
As technology and (your) experience increases the cost will be less.
The end
The
Thank you for your attention!
I’m happy to answer your questions.
Teşekkürler