Ing. E.F.H. de ValkWaste and Energy

Wastewater treatment in the Netherlands“Development of energy efficient technology”

Program• Introduction• Organisation and tasks of the

waterboards• Wastewater treatment in the

Netherlands • Developments/Innovations

25 water boards Union of water boards(23 in 2012)

Tasks of the water board• Water system management (flood, quantity,

quality)• Treatment management (treatment of urban waste

water)• Main tasks: Protection against floods, water

management, water quality care and treatment of waste water

• Exemplary function water board: The way tasks are executed in the middle of society Collaboration!!!!

History of waste water treatment in the Netherlands (1)1900 -1970 :• Settling particle removal.• Cold sludge digestion1970 -1980 :• Introduction Water Pollution Act • Polluter Pays Principle• Construction of active sludge treatment plants• BOD and COD removal• Oxidation of nitrogen (N) (high energy

consumption)

History of waste water treatment in the Netherlands (2)1980-1990:• Attention for nutrients in surface water

(“P” en “N” removal from waste water)• Digestion: Sludge Biogas Energy Cost

Reduction1990-2005: • Stricter effluent quality requirements• Ongoing (biological) P and N removal• Rapidly increasing energy costs• Sense of urgency for energy efficiency improvement due

to climate change and cost reduction

History of waste water treatment in the Netherlands (3)2005-current:• Energy efficiency “HOT ITEM !!!”• Waste water is energy carrier• Long term agreement on energy efficiency (2008)• Ongoing R&D of energy efficient waste water

treatment technology• Waste water treatment plants are energy factories• Raw material recovery from waste water• Ongoing cooperation between water boards and

between water boards and private companies

Examples of new developments / technology• NEREDA (aerobic granulate sludge technology)• DEMON (N removal from return liquors)• Automatic Backwash Filter (energy efficient sand filter)• P and N removal• High pressure active sludge hydrolysation • UWWT as Energy Factory

But also developments on sludge treatment, odor treatment and noise reduction

Technical Innovations Nereda (Urban Waste Water Treatment Epe, the

Netherlands)

Realisation of a Nereda installation at the WWTP Epe

-/- 30% !!!

Water board Veluwe is building the wastewater treatment plant of the future

Less energie use, cleaner water

History in a nutshell• 1993: TUD research• 1998: DHV/TUD collaboration• 2000: feasibility study• 2002: stable granule formation on labscale• 2003: STOWA (Foundation for organizational water

management) pilot research at WWTP Ede• 2005: Vernufteling 2005 (prestigious price for

engineering) and introduction of Nereda• 2005: pilot study WWTP Aalsmeer• 2006: pilot study WWTP Epe• 2006: start research in collaboration with STOWA

and 5 district water boards• 2007: study at WWTP Hoensbroek• 2008: pilot study at WWTP Dinxperlo• 2009: realisation of 1rst full scale Nereda installation in Epe

Innovations/operational activities at district waterboard Veluwe (technical)Nereda (Urban Waste Water Treatment Epe, the Netherlands) Demon (Part stream treatment of nitrogen at WWTP

Apeldoorn)

Demon: part stream treatment installation (Nitrogen removal)

60 % less energy use

Innovations/operational activities at district water board Veluwe (technical)Nereda (Urban Waste Water Treatment Epe, the

Netherlands) Demon (Part stream treatment of nitrogen at WWTP

Apeldoorn)Automatic Back wash Filter (WWTP Harderwijk)

Automatic Back wash Filter (ABWF)

Seriously take energy into account when assessing tenders for projects (EMVI)

Innovations/operational activities at district waterboard Veluwe (technical)Nereda (Urban Waste Water Treatment Epe, the

Netherlands) Demon (Return Liquor treatment of nitrogen at WWTP

Apeldoorn)Automatic Backwash Filter (WWTP Harderwijk)Energy production from waste streams

(several WWTP’s)Supply of energy (electricity and heat)

Energy production at WWTP Apeldoorn

Collaboration between public and private parties

Unique opportunity

Result: a special Project

Sewage waterEffluent

hot water 70oC

return water 40 oC

Bio gasAuxili

ary

boiler

Explanation of the system

Digester

Potable water

Production of Heat and Electricity WWTP Apeldoorn

5,500,000 m3 biogas per

year

PRODUCTION OWN USE

ELECTRICAL16,000,000 kWh/year 9,000,000

kWh/yearTHERMAL56,500 GJ 16,000 GJ

Year duration curve of Zuidbroek

prognose jaarbelasting bij n=1.100

-

1.000

2.000

3.000

4.000

5.000

6.000

7.000

januari

februari

maart ap

ril mei

juni

juli

augustus

september

oktober

november

december

GJ

prod

uctie

per

maa

nd

Innovations/operational activities at district waterboard Veluwe (technical)Nereda (Urban Waste Water Treatment Epe, the

Netherlands) Demon (Return Liquor treatment of nitrogen at WWTP

Apeldoorn)Automatic Backwash Filter (WWTP Harderwijk)Energy production from waste streams

(several WWTP’s)Supply of energy (electricity and heat)Thermal hydrolysis of sludge

Thermal hydrolysis of sludge

• Thermo-druk-hydrolyse– Temperature and pressure

treatment– Improving organic matter

degradation– Applyed to secondary

sludge• Two kinds:

– batch (Cambi)– continue (Sustec)

Thermal hydrolysis of sludge

Innovations/operational activities at district water board Veluwe (technical)Nereda (WWTP Epe) Demon (Part stream treatment of Nitrogen at WWTP

Apeldoorn)Automatic Backwash Filter (WWTP Harderwijk)Energy production from waste streams

(several WWTP’s)Supply of energy (electricity and heat)Thermal hydrolysis of sludgeRegaining raw materials (Phosphorus WWTP

Apeldoorn)

P recovery from centrate

• Up to: 95% P recovery• 99% pure and

sustainable product: Struviet

Energy efficient UWWT = Reality