Namur Urban waste water collection and treatment

26th of October 2015

ESTONIAN WATER WORKS ASSOCIATION EVEL

Baseline data

• POPULATION : 105.000 inhab.

• POPULATION Meuse upstream : 92.000 inhab. • POPULATION Sambre : 13.000 inhab.

• Collective treatment systems : 96.000 inhab. (13.000 m3 WW/d)

• Individual treatment systems : 9.000 inhab (+- 10 %). • At the confluence of 2 main rivers : Meuse and Sambre

24/06/2010 3 22/04/2010 FORUM TTE 3

24/06/2010 5 22/04/2010 FORUM TTE 5 Origine du réseau d’égouts urbain

Namur

Brumagne WWTP

93.100 EH - 2011

Existing collectors since 1985

Houyoux collector 2008

Pressure collectors and vortex 2007-2011

Namur - Brumagne area

Conception

• Waste water pressure transport • Goal : Avoid to many groundworks and lower pipe sections

• Objectives : Limit displacement of pipes and other networks

• Treatment of water discharge under rain time • Goal : Compensation of flow limit involved with pressure

systems

• Objectives: Lower discharge of water during rain time

MEUSE

DO

cv

MEUSE EU

Gravity

collector –

waste water

Unit water : mixed rain and waste

waters Discharge of unit

waters during rain

time

Storm weirs

Intercepts waste water

limits yield

DEPTH

3 to 6 m

BASIS SCHEME

MEUSE MEUSE

Discharge of

unit waters

during rain

time

Pressure collectors

Pumping station

Flow regulated

Calibrated overflow

DEPTH

1,8 to 3 m

UNDER PRESSURE SCHEME

Unit water : mixed rain and

waste waters

Longitudinal profile of the collector

Path along the river

BASIS SCHEME :

SUCCESSIVE PUMPING

Intermediate pumping station Path along the river

PRESSURE COLLECTORS SCHEME :

PUMPING WITH ONE MAIN DISCHARGE

SPI

Rain water treatment

• Treatment system at each urban discharge

• « Vortex » technology

• Objectives :

• Separate particulate matter (200µ)

• Take off floating matter (>1 cm)

Sewer

arrives in

"Vortex"

Waste water

and mud Treated

water to

Meuse

Summary

Séparateur Vortex

Sewer

Riv

er

Flow selector

Q (t)

Égout

existant

Pumping

Grid C

olle

cte

ur b

asse

pre

ssio

n

4 Qts Mixing

zone Setteld SM

40 Qts

36 Qt363

440 DWF

440 DWF

436 DWF

44 DWF

Q(t) –

4DWF

Main data’s

• Vortex : 37 units

• Pumping stations :10 units

• Pipe lengths (cumulated) : 15 km

• Cross section of pipes : 200 mm upstream until 900 mm downstream

• Bidder : SM CFE – DANHEUX & MAROYE - NIZET

• Amount of works: 48.770.000 €

• Commissioning start from 05-2007

• End of works: 04-2011

Complex works

Thank you