Wastewater treatment in the Netherlands “Development of energy efficient technology�
Ing. E.F.H. de Valk Waste and Energy
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 digestion 1970 -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 Reduction 1990-2005: • 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)
Seriously take energy into account when assessing tenders for projects (EMVI)
Automatic Back wash Filter (ABWF)
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
Explanation of the system
Digester
Auxilia Bio gas
ry boiler
hot water 70oC
return water 40 oC
Effluent
Sewage water
Potable water
Production of Heat and Electricity WWTP Apeldoorn 5,500,000 m3 biogas per year PRODUCTION ELECTRICAL 16,000,000 kWh/year THERMAL 56,500 GJ
OWN USE 9,000,000 kWh/year 16,000 GJ
Year duration curve of Zuidbroek prognose jaarbelasting bij n=1.100
6.000 5.000 4.000 3.000 2.000 1.000
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GJ productie per maand
7.000
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 sludge Regaining raw materials (Phosphorus WWTP Apeldoorn)
P recovery from centrate
• •
Up to: 95% P recovery 99% pure and sustainable product: Struviet
Energy efficient UWWT = Reality