A.Choulot-investing_in_Sustainable

Aline Choulot, MHyLab, CHBrussels12.02.09

Multipurpose plants

Multipurpose schemes

Electricity production = 2nd objectiveMain multipurpose schemes = water networksThe 1rst objective:• to supply drinking water• to collect and treat wastewater• to irrigate

• Existing infrastructures (pipes, water chamber, head water basin…)

Excess pressure of adduction water networks can be used to generate energy

Bases: MHyLab's references, as 31 (among 53) 31 (among 53) of the of the MHyLabMHyLab designed turbines are set on designed turbines are set on water networkswater networks (+ numerous feasibility studies)

Drinking water turbining

Savièse turbine on drinking water (CH)1 Pelton, vertical axis,3 nozzlesFirst starting up: 2004Gross head: 217 mMax. discharge: 300 l/sMax. electrical output: 465 kW

• To replace pressure-breakers• Without any impacts on water quality:

Turbine schemes similar to pumping ones

• With a by-pass to respect the first objective of the scheme

Precautions:• Stainless steel

• No contact between water / grease

Annual production: 1.8 GWh/yearTechnical design: MHyLabTurbine supplier: GASA SA (CH)Operator: Savièse commune

Savièse: 3 turbines on its drinking water network and projects of 2 other ones

Photo sources: MHyLab, Savièse, Gasa SA

Disassembly necessaryDisassembly necessaryWater accessyesnoAutomatic by pass

Cast, black steel, stainless steel, bronze

Cast, black steel, stainless steel, bronze

Usual building materials of the hydraulic machine

Yes, if electrical power is higher than a few tens

of kW

Yes, if electrical power is higher than a few tens

of kW

Medium voltage / high voltage transformer

yesyesElectrical boxesyes (generator)yes (engine)Electrical machine

yesyesRoller bearings greased for life

yesyesCasing and runner in contact with water

yesyesShaft joints

yesyesRunner linked to a rotating shaftyesnoDischarge regulation device

yesyesInlet valve

Turbining stationPumping station

Low-head drinking water turbineCurrent project in Italy

Photo sources: MHyLab, Nuove Acque

Axial turbine (regulating device)Horizontal axisHead = 12.5 mQ = 380 l/sVariable speedPm = 38 kWProduction = 350'000 kWh/year(electricity consumption of 70 households)Designer: MHyLabManufacturer: Desgranges Sarl (France)Operator: Nuove Acque (Italy)

Similar project in Lausanne (CH)

Turbine as a by-passof the current pressure breaker valve

Runner

valve

6 blade axial turbine

runner

Photo sources: MHyLab

Turbines on wastewater networks

Wastewater turbiningbefore the treatment

stationWastewater

turbining after the treatment station

Turbining station

Turbining station

Screening & decanting station

WWTP

WWTP

Wastewater treatment plant

Water stream

Wastewater treatment plant

Châble - Profay power plantOn Verbier wastewater (CH)

Photo sources: MHyLab, SIB

• 1 Pelton, vertical axis• 2 nozzles• Difference in levels: 450 m• Max. discharge: 100 l/s• Electrical output: 350 kW• Production: 825'000 kWh/year(electricity consumption of 165 households)• Investment: 365'000 €• Design: MHyLab (CH)• Turbine supplier: Gasa SA (CH)• Operator: SIB Services Industriels de Bagnes (wastewater treatment service)

Châble Profay SHP (CH) on wastewater

Rehabilitation - 2008

Photo sources: MHyLab, Gasa SA, SIB

Penstock and turbine designs Penstock and turbine designs specific to raw wastewaterspecific to raw wastewater• penstock internal diameter• materials• by-passTurbine design: • suppression of all potential zones where wastes could accumulate• easy dismantling for cleaning• …For Pelton:• no needle bearing cross bars• no deflectors (security device)• …

Châble Profay SHP on wastewater

Rehabilitation - 2008

Photo sources: MHyLab, Gasa SA, SIB

SHPs before and after the WWTP:Amman city, As Samra WWTP (Jordan)

Photo sources: MHyLab

Treated-water SHP:2 Francis, vertical axisFirst starting up: 2006Difference in levels: 42 mInstallation discharge: 4.6 m3/sElectrical output: 807 kW per turbineAnnual production: 8.6 GWh/year

Row-water SHP:2 Pelton, vertical axis, 5 nozzlesFirst starting up: 2006Difference in levels : 104 mInstallation discharge: 2.5 m3/sElectrical output: 830 kW per turbineAnnual production: 12.5 GWh/year

Project: Suez Group & Ondéon Degrémont (Fr)Engineering: MHyLab

Turbine supplier: Andritz VATECH

• Armary: •Small water stream flowing between Montherod and Allaman•Historically canalized to water the lands of Allaman castle•Pumped by the farmers to irrigate their fields•Since 2006: stream under load:•To irrigate the fields (145 hectares): •= water available for the farmers at the pressure directly suitable to their jets (� 10 bar) (no pumps are needed: reduction of the electricity consumption)•To generate electricity (turbine regulated from the upstream water level in the loading basin: the turbine should never stop)

Armary power plant - Aubonne

• Start up: 2006•Pelton, 2 nozzles•Difference in altitude: 105 m•Nominal discharge: 90 l/s•Electrical output: 68 kW•Electrical production: 454'000 kWh/year (the consumption of 100 households)•Hydraulic design: MHyLab•Manufacturer: Gasa SA (Lausanne)•Operator: le Groupe Arrosage(Aubonne)•Investment: 650'000 CHF•Cost price: 10 cts CHF/kWh

Armary power plant - Aubonne

1416/02/2009

La La DouveDouve II (Swiss Alps) II (Swiss Alps) on on treated wastewatertreated wastewater

1 Pelton, vertical axis2 nozzlesStarting up: 2001Net head: 79 mMax. discharge: 108l/sMax. electrical output: 75kWProduction: 400 MWh/year

Technical design: MHyLabTurbine supplier: Gasa Sa (CH)Erection: 4 months at workshop

and 23 minutes on site

Turbines on drinking water networksPotentials in Switzerland

Savièse turbine on drinking waterPhoto sources: MHyLab, Savièse, Gasa Sa

Small hydropower plants (SHP) in operation : around 90 turbines (24 MHyLab designed turbines)in 1901 was set a turbine on drinking water in the Lake of Geneva area–1'600 kW, 6'600'000 kWh/year -1320 households-

• Remaining potential in Switzerland• 380 SHPs• 175'000'000 kWh/year (or the electricity consumption of 35'000 households)

Sources: Suisse Energie

Turbines on wastewater networksPotentials in Switzerland

Small hydropower plants in operation: • On raw wastewater: 1 (MHyLab)• On treated wastewater: 8 (1 MHyLab)

Remaining potential: • On raw wastewater: around 80 SHP or 30'000'000 kWh/year (electricity consumption of 6000 households)• On treated wastewater: around 40 SHP or 15'000'000 kWh/year (electricity consumption 3000 households)

Le Châble-Profay runner on wastewaterPhoto sources: MHyLab, Gasa Sa, SIB

Sources: Suisse Energie

• feasibility study:• for the definition of the site characteristics:

• discharges – flow duration curve• head • head losses

• for the definition of the turbine nominal discharge and head• turbine developed in laboratory supplied with proven efficiency guarantees• specific design for raw wastewater• integration of a by-pass to respect the first objective of the multipurpose scheme

Success keys

Conclusions

• Other kinds of multipurpose schemes• irrigation networks ( ex. in Switzerland, in Italy)• biomass plant (cooling system, ex. in Spain)• desalting systems

• An interesting remaining potential worldwide• Optimal use of resources • Long life equipment• Positive impacts on environment• Financial opportunity for communes and networks companies• Efficient available techniques, still improved so as notably to reduce cost (investments and operation ones)

• SHAPES will publish a brochure in 2010 on multipurpose schemes with potentials, technical analysis & cases presentations from all around Europe (www.esha.be)

To know more

CH- 1354 MontcherandSwitzerland

Tel.: +41 24 442 87 87Fax: +41 24 441 36 54

[email protected]