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Upgrading Wastewater Lagoons with Membrane Technology

This research project explores the use of membrane technology to upgrade wastewater lagoons for improved effluent quality and potential reuse. The advantages of using membrane bioreactors and combining lagoons with membrane filtration are highlighted. The pilot plant in Wildberg, Germany serves as a case study for successful implementation.

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Upgrading Wastewater Lagoons with Membrane Technology

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  1. Membranelagoon Wildberg – Upgrading of Wastewater Lagoons by Membrane Technology Dipl. Geogr. Katharina Teschner Technical University Berlin, Germany Research Project Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  2. 1 Problem in arid and semiarid regions Agricultural irrigation Drinking water supply Need for waste water reuse 2 Problem in temperate climates Reduction of surface water quality due to loading by effluent of overloaded treatment plants Need for improving effluent quality Research Background Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  3. Wastewater lagoons are applied worldwide: • easy to construct • easy to operate and maintain • low investment and running costs Types: • Sedimentation lagoons • Naturally aerated lagoons • Artificially aerated lagoons • Polishing lagoons • In Germany: • more than 1000 lagoons, mainly in rural areas • standards according to ATV A 201 giving design criterias • Standards also exist in many other countries. Decentralised Wastewater Treatment Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  4. Huber VRM membrane unit • Membrane bioreactors (MBR) is the latest development in wastewater treatment • small footprint • reduced sludge production • disinfection without using chemicals • dropping investment costs • several systems available: Huber, Zenon, Kubota In Germany: more than 10 large scale plants, the largest for 80 000 inhabitants started operation in 2004 membrane module Decentralised Wastewater Treatment Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  5. solid/liquid seperation • effluent free from pathogenic microorganisms • high-quality polymer membranes • pore width: 38 nm • semi cross flow system • permeation vacuum pressure (<200 mbar) HUBER VRM Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  6. Adoption of membrane technology to wastewater lagoons Transfer of simple wastewater lagoons to membranelagoons Combined lagoon-membrane system Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  7. Advantages smaller volume (less than 1 m³/inh. instead of 10 m³/inh.) considerable increase of biomass in the lagoon smaller lagoon surface minimizing evaporation losses effluent free of bacteria, helminth eggs and others no formation of dangereous by-products different ways of operation possible  with or without nitrification Combined lagoon-membrane system Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  8. Pilotplant Wildberg • municipal wastewater • seperated sewer system • desigend for 900 inhabitants • 700 inhabitants connected polishing lagoon clarifying lagoon efffluent surface water aerated lagoon 2 aerated lagoon 1 screen VRM permeate influent TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  9. Aerated lagoons TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  10. Clarifying lagoon Polishing lagoon TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  11. Pilotplant Wildberg • Membraneplates 60 • Membranesurface 45 m² • Membranematerial PES • Turnings 2/min. • Flux (gros)  30 l/(m²*h) • Transmembranepressure  300 mbar • Cross-Flow 50 m³/h • Aeration 16 m³/h • Volume 4,5 m³ HUBER VRM 20/15 TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  12. Pilotplant Wildberg 1-1,5 g/l DS concentration up to 15 g/l TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  13. Pilotplant Wildberg TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  14. Transmembranepressure/ Flow bad operation conditions good operation conditions TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  15. COD degradation BOD5 degradation TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  16. Ammonia degradation Nitrate concentration TP Wildberg Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

  17. Combining wastewater lagoons with membrane filtration works ! Requirements to the productmanagers developing membrane technology: • technology as simple as possible • low maintenance • low energy consumption • long lifespan Adapted technology for application worldwide, not only in technically advanced regions. Conclusion Dipl. Geogr. Katharina Teschner METU 10.06.2005 Dep. of Sanitary Engineering

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