1. Energy Efficiency and Competitiveness with Advanced Wastewater Treatment How a wastewater treatment plant can be more efficient and achieve better results? Protection notice / Copyright notice

2. Page 2 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Contents Energy saving in the biological treatment process Reduce Energy Costs through Reduction of Biological Solids Energy savings and environmental care through broad filtering technologies for Water-Reuse

3. Page 3 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Sludge Disposal Sludge Reduction Discharge Reuse Wastewater treatment process Screening/ Grit Removal Sedimentation Clarification BiologicalClarification Water Path 60% DisinfectionFiltration Biological Solid Reduction Reuse Sludge Reduction

4. Page 4 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Typical use in Brazilian ETE’s “Aerobic Process” Aerobic + Nitrifying Bacteria + Oxygen Solids Wastewater Secondary Clarifier Effluent Recycle Solids Waste Aerobic + Nitrifying Bacteria + Oxygen Aerobic: Organic NNH 4 + NH 4 + O 2 NO 2 _ + O 2 NO 3 = O2O2 Membrane Diffusers

5. Page 5 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt The Siemens Answer “Aerated Anoxic Reactor” What is it? A biological reactor in which the oxygen delivery is less than the oxygen demand, thereby, creating a zone of continuous oxygen deficiency (avg. DO levels between 0 and 0.5 mg/L). O 2 Demand O 2 Supplied Deficit Result = ‘0’ DO O 2 Supplied < 75% of O 2 Demand m O 2 [kg] / t [h]

6. Page 6 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt The Siemens Answer Orbal ® - Aerated Anoxic Reactor Disc aerators Weather Hoods Treatment of wide range of inlet concentrations  Changing Disc Immersion  Speed Variation  Smart Control Used in mixed networks without additional tanks / retention units  Bypassing the first channel retaining the biomass Low maintenance costs  No replacement of membranes every 4 – 5 years  No (vibrating) air pipes / grids  No compressors  No need of draining the channel for maintenance

7. Page 7 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt The Siemens Answer VLR - VertiCel ® - Aerated Anoxic Reactor

8. Page 8 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt The Siemens Answer “Aerated Anoxic Reactor”  Energy savings between 20 and 35%  Reduced maintenance costs  Improved Process Performance simultaneous nitri- / denitrification Conventional Aerobic Process (non anoxic) Energy 100% VertiCel ® Process (aerated anoxic) ~ 20 - 25% ~ 30 - 35% Orbal ® Process (aerated anoxic) 50 60 70 80 90 100 012345678910 Internal Recycle (Qint/Q) Removal Efficiency (%) Conventional Aerated-anoxic Total Nitrogen Removal Comparison

9. Page 9 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Reduction of all important parameters Annual Data Summary Hammonton, NJ YearLimitBOD 5 TSS (mg/l)NO 3 TPO 4 Operation 5 3033 CONAMA / SP60 InfluentEffluentInfluentEffluent 19953531,603693,401,712,07 19993321,003831,600,961,18 20053141,103021,600,441,59 all concentrations in mg/l

10. Page 10 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Discharge Reuse Wastewater treatment process Biological Solid Reduction Screening/ Grit Removal Sedimentation Clarification BiologicalClarification Water Path DisinfectionFiltration Sludge Reduction

11. Page 11 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt The Siemens Answer Omniflow ® ISBR Process (Cannibal)

12. Page 12 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Operational Data: Plant Blue Ridge, GA “ Nearby no biosolids “ Year Flow (m3/a) Biosolids (t) / aLimitBOD 5 TSS Conventional Plant Siemens Plant Operation 5,0 30 CONAMA / SP 60 InfluentEffluentInfluentEffluent 1998 378.5003.375030041675 1999 489.1004.375024832306 2000 471.1004.210027332887 2001 512.5004.5800250424910 2002 504.3004.5400225420415 2003 648.0005.7901022032107 2004 598.2005.4600242423612 2005 650.7005.830018731969 all concentrations in mg/l

13. Page 13 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Reduce energy costs through reduction of biological solids Minimal aeration is used in the interchange bioreactor tank. The biomass are interchanged and cycled between the aerobic and non aerobic environment: Biological solids are destroyed and significantly reduced Result: Lower costs (energy and operation)  Less required aeration in the aerobic process lead to energy savings  Reduced production of biological solids which only need to be purged periodically from the system Case Study: 6 mgd plant in Alabama – $95.000 saved energy costs per year

14. Page 14 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Discharge Reuse Wastewater treatment process Biological Solid Reduction Screening/ Grit Removal Sedimentation Clarification BiologicalClarification Water Path DisinfectionFiltration Reuse

15. Page 15 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Energy savings and environmental care through broad filtering technologies for Water-Reuse Hydro-Clear Filter ® ~ 100 µm Forty-X™Disc Filter ~ 10 µm Membranes - MBR ~ 0,4 µm Applications  Effluent discharge  Reclamation and reuse  Irrigation water Applications  Irrigation water  Industrial process water  Cooling water Applications  Groundwater recharge  Boiler feed  Process water

16. Page 16 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Contact Thomas Kerl Siemens Water Technologies Av. Mutinga, 3.800 - Pirituba 05110-901 São Paulo, SP Phone:++55 11 3908 1831 thomas.kerl@siemens.com

17. Page 17 15/09/2008 Water Technologies Thomas Kerl Idb_final.ppt Muito obrigado pela sua atenção! Protection notice / Copyright notice