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Autmonet 2007

Workshop 4 sept.

Michel Moens

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The effect of sewer overflows and the treatment plant on the waterquality of the Dommel at Eindhoven the Netherlands

• About the project

• Monitoring plan

• Monitoring devices

• Monitoring in practice

• Data collection en data management

• Results

• Future

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Participants

• Waterboard the Dommel (monitoring surface water)

• Municipality of Eindhoven (monitoring sewers, rainfall)

• IMD (maintenance)

• vd Linden Pomptechniek (maintenance)

• ARCADIS (data management)

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Planning

• 2000-2015 disconnecting paved area

• 2004-2006 cleaning up sand-catch devices in surface water

• 2006 increase capacity of treatment plant to 18.000 m3/h

• 2007-2008 storage settling tank Kosmoslaan, 8.000 m3

• 2009-2010 increase internal storage + RTC

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Objectives

• Knowing the effects of the measures on the pollutant discharge

• To get insight in the effects of the pollutant discharge on the surface water quality

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Quality

• 7x discontinue waterquality monitoring points• 3x automatic sampling units surface water• 2x automatic sampling units overflow water• 1x automatic particle meter effluent• 6x oxygen meters• 2x turbidity meters• waterground research• biologic research

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Quantity

• 3x discharge surface water (weir + waterlevel)

• 3x discharge/waterlevel treatment plant• 2x waterlevel surface water• 4x rainfall• 29x waterlevel sewer overflows

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Sampling units surface water

• WTP: start sampling on waterlevel sewer overflow V. vd Heuvellaan (-25 cm)

• Soeterbeek: start sampling on oxygen level effluent WTP

• Kerkhoef: start sampling on waterlevel sewer overflow Kosmoslaan (-25 cm)

• Telemetry: SMS• Problems:

- Finding locations (private properties, electricity)- SMS signal, SIM-cards- Time-frequency sampling- Organization bottles lab- Vandalism

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Sampling units overflow water

• V. vd Heuvellaan : start sampling when waterlevel 50 cm below weir level

• Kosmoslaan : start sampling when waterlevel 50 cm below weir level

• Telemetry: direct connection• Problems:

- Changing location (SST)- Choice of sampling volume (100 500 m3)- 1 liter not enough for analyzing COD, BOD, SS, Zn,

Cu, P-tot, N-Kj (combining 2 bottles)- Too high waterlevel (too small pipe diameter)- Sampling time too slow (15 min 3 min)- Handling the sampling unit (different persons)- Need for extra bottles (delivery time)- Organizing bottles lab

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• WS316 INLINEcut (ODS)

• in-line

• cutting device pump

• sampling pump starts 10 cm below first sample moment

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Oxygen meters

• Telemetry: stand alone• Location: nearby watermills (cooperation private-public)• Sampling time: 5 minutes• Endress & Hauser, Licquisys-s com 223 (optical)• Problems:

- Not in the middle of the river (too expensive)- Floating material (polluted sensors)- Angry miller (took out the device)- Maintenance (1x pro 3 mnth 1x pro 1 mnth)- Molest (city centre)- Changing keys (unknown)

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Effluent

0

2

4

6

8

10

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20/03/03 28/06/03 06/10/03 14/01/04 23/04/04 01/08/04 09/11/04

O2

[mg

/l] Voor calibratie

Na calibratie

Handmatige meting

Verdeelwerk

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2

4

6

8

10

12

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20/03/03 28/06/03 06/10/03 14/01/04 23/04/04 01/08/04 09/11/04

O2

[mg

/l]

Voor calibratie

Na calibratie

Handmatige meting

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Calibration results april and june 2007

Before calibration(mg/l)

After calibration (mg/l)

Comments

Effluent 3,4 4,9 Algae

Effluent 5,0 5,7 Algae

STP 7,4 8,0 Floating dirt

STP 6,6 7,5 Floating dirt

Collse watermill - - Lock has been changed

Collse watermill 1,9 5,8 Sensor polluted

Hooijdonkse wm 3,5 6,5 Membraan defect, new one

Hooijdonkse wm 3,0 5,0 -

Seperate point 8,4 9,3 Sensor broken off

Separate point 7,7 8,1 Sensor broken off

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SensorFlow direction

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Turbidity meters

• Telemetry: direct connection• Location: in the manhole of the overflow sampling unit• Sampling time: 1x pro minute• Dr. Lange, solitax T-line

• Problems: - High water level during dry weather flow- Floating material attaching to device

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overstortwater 13-09-2001

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100

200

300

400

500

03:21 03:36 03:50 04:04 04:19 04:33 04:48

Tijd

CZ

V,

mg

/l

CZV lab, mg/l CZV formule Delft

Overstortwater 19-09-2001

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25

50

75

100

09:36 10:48 12:00 13:12 14:24 15:36 16:48

Tijd

CZ

V, m

g/l

CZV lab, mg/l CZV formule Delft, mg/l

rioolwater 13-09-2001

0

100

200

300

400

500

01:55 03:07 04:19 05:31Tijd

CZ

V,

mg

/l

CZV formule Delft, mg/l CZV lab, mg/l

rioolwater 19-09-2001

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200

400

600

800

1000

1200

08:24 08:52 09:21 09:50 10:19 10:48 11:16 11:45

Tijd

CZ

V,

mg

/l

CZV formule Delft, mg/l CZV lab, mg/l

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CZV als functie van troebelheid

0

200

400

600

800

1000

1200

1400

Troebelheid (FNU)

ber

eken

d C

ZV

(m

g/l) overstort Stolwijk

pompput Stolwijk(indicatief)

VIS-riool Delft

overstort Delft(indicatief)

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Datacollection and datamanagement

• Waterboard quality data- effluent- surface water- overflow water

• Waterboard quantity data• Municipality quantity data• IMd oxygen en calibration data• vd Linden rainfall and turbidity data• Logbook data• Starting measurements in 2000

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Data management with Viewmaster

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Viewmaster

• All data stored in one database• Access to all data by internet• Quantity data and quality data and logbook information

together• Yearly management reports• Datavalidation and data verification tools• Statistical analysis

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