Norway and Poland – Partners in “Green Growth”            Warsaw, 10 May 2012     Session III. Cleantech Innovations in Wa...
Wastewater background Wastewater from residents (toilets, kitchen, bathroom and  laundry), commercial activities and indu...
Valuable resources in wastewater• Organic matter (energy)                         Create• Nutrients (phosphorus and nitrog...
Energy recoveryFrom wastewater• Heat pumps producing heat from treated wastewater• Microbial fuel cells producing electric...
Nutrient recovery From wastewater sidestreams (reject water)                           biogas- P-recovery by struvite pre...
Water recovery (water reuse) Treated wastewater for      - Non-potable use      - Irrigation      - Recharge of groundwat...
Summary Great potential for recovery and utilization of wastewater  resources Recovery of renewable energy is often cost...
THANK YOU FORYOUR ATTENTION!
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4 wastewater a valuable resource b pasulsrud aquateam

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4 wastewater a valuable resource b pasulsrud aquateam

  1. 1. Norway and Poland – Partners in “Green Growth” Warsaw, 10 May 2012 Session III. Cleantech Innovations in Water Wastewater – a valuable resource Bjarne Paulsrud and Beata Szatkowska Aquateam AS
  2. 2. Wastewater background Wastewater from residents (toilets, kitchen, bathroom and laundry), commercial activities and industries are considered to be a nuisance, and something that most people would like to get rid of without any effort Most municipalities and cities have a wastewater collection system (pipelines, pumping stations) that transports the wastewater (including some rainwater) to one or more wastewater treatment plants The design and operation of the wastewater treatment plant decide the potential for recovering and utilization of the valuable resources in wastewater
  3. 3. Valuable resources in wastewater• Organic matter (energy) Create• Nutrients (phosphorus and nitrogen) Value• Heat from Waste!• Water Wastewater treatment plants are normally designed to reduce the content of organic matter and nutrients in order to protect the environment (receiving waters). Energy (and often chemicals) are used to achieve this, without much consideration of the sustainability of the treatment plant In recent years the interest of recovering resources from wastewater has increased dramatically, and many wastewater treatment plants have plans to be energy neutral within few years («energy factories»)
  4. 4. Energy recoveryFrom wastewater• Heat pumps producing heat from treated wastewater• Microbial fuel cells producing electricity (emerging technologies)From wastewater sludges Biogas production in anaerobic digestors (60-70% methane) sludges Mixing - Central heating systems and heating - Combined heat and power (co-generation) ~ 37°C or - Upgrading to vehicle fuel ~ 55°C - Upgrading for supply to a natural gas grid Fuel for incineration, pyrolysis or gasification processes Fuel for the cement industry
  5. 5. Nutrient recovery From wastewater sidestreams (reject water) biogas- P-recovery by struvite precipitation- N-recovery as ammonium salts by Mixing sludges and stripping or ion exchange heating ~ 37°C- Nutrient recovery by evaporation or or ~ 55°C membrane filtration Sludge liquor Dewatered (reject water) digested sludge (biosolids) From wastewater sludges- Use as an organic fertilizer in agriculture or in soil amendment products
  6. 6. Water recovery (water reuse) Treated wastewater for - Non-potable use - Irrigation - Recharge of groundwater basins
  7. 7. Summary Great potential for recovery and utilization of wastewater resources Recovery of renewable energy is often cost-effective today, and the target of energy neutral wastewater treatment plants will move the whole wastewater sector towards sustainability Large wastewater treatment plants have a better potential for cost-effective resource recovery than smaller plants, and inter-municipal cooperation is recommended to avoid sludge to landfill solutions
  8. 8. THANK YOU FORYOUR ATTENTION!

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