Wastewater Treatment or Resource Recovery: Maximizing the Energy Potential of Your Infrastructure

1. Wastewater Treatment or Resource Recovery:Maximizing the Energy Potential of Your Infrastructure Angela Hedgecock, PE, CEM, LEED AP Siemens Industry, Inc.

2. Presentation Outline • Overview of Energy Use for Wastewater Treatment • Opportunities to Reduce Operating Cost • Wastewater Infrastructure as a Resource • Energy Savings Performance Contracting • Questions Net Zero through Emerging Technologies

3. Overview of Sector-wide Energy Use 30-40% of energy budget 3% 25 – 40% of operating budget Net Zero through Emerging Technologies

4. Facility Energy Use 1 • Biological Aeration 39% • Aerobic Digestion 35% • Pumping 14% • Lighting / Buildings 6% • Thickening / Dewatering 3% • Clarifiers 2% • Headworks 1% • Chlorination <1% 1 Water Environment Federation MOP 32 Energy Conservation in Water and Wastewater Facilities 2009. Appendix C Table C.2. Activated Sludge WWTP – 5 MGD. Net Zero through Emerging Technologies

5. Total Operating Cost 30% Staffing 40% Energy 5% 15% Chemicals Maintenance Solids 10% 10-3-12 Net Zero through Emerging Technologies

6. Typical Cost Savings Opportunities • Energy Efficiency • Aeration or mixing upgrades (blowers, diffusers, controls) • Pumping system upgrades (pumps, VFDs, controls) • Biological process improvements/modifications • Improved ultraviolet disinfection system controls • Motor replacement, ventilation, lighting • Solids Thickening, Dewatering, and Disposal • Improvements to dewatering or thickening • Mechanical dewatering or drying • Improved digestion (aerobic or anaerobic) • Alternative solids destruction processes • Chemical Savings • Conversion to biological phosphorus removal • Optimized chemical feed system operation • Odor control system replacement 10-3-12 Net Zero through Emerging Technologies 6

7. Conventional Approach to Waste Management Wastewater Collection Wet Stream Treatment Effluent Pumping Surface Water/ Groundwater Solids Handling and Dewatering Solids Solids Municipal Solid Waste (MSW) Landfill 10-3-12 Net Zero through Emerging Technologies 7

8. Anaerobic Digestion Provides Benefit Wastewater Collection Wet Stream Treatment Effluent Pumping Surface Water/ Groundwater Anaerobic Digestion Solids Reduced Solids Landfill • Biogas for Beneficial Reuse: • Digester Heating • Cogeneration • Sludge Drying 10-3-12 Net Zero through Emerging Technologies 8

9. Hauled Wastes Improve Feasibility for Small Plants Improved FOG Control Wastewater Collection Wet Stream Treatment Effluent Pumping Surface Water/ Groundwater Anaerobic Digestion Solids • Hauled Wastes: • FOG • High Strength Wastes Increased Biogas Production Potential Revenue through Tipping Fees Landfill 10-3-12 Net Zero through Emerging Technologies 9

10. Co-digestion Provides Further Benefit Wastewater Collection Wet Stream Treatment Effluent Pumping Surface Water/ Groundwater Anaerobic Digestion Solids Food Waste Further Increase to Biogas Production Potential Increased Revenue through Tipping Fees Landfill Reduced Organics in MSW 10-3-12 Net Zero through Emerging Technologies 10

11. Benefits of “Re-thinking” Waste Management • Holistic approach to waste management can create additional opportunities • Hauled wastes and food wastes can make anaerobic digestion and biogas recovery feasible for smaller facilities • Military installations have the ability to effectively control waste streams and implement co-digestion • Newer technology allows digestion of higher solids waste streams providing greater flexibility and opportunity • The ability to generate renewable electricity on-site helps meet both energy efficiency and energy security objectives 10-3-12 Net Zero through Emerging Technologies 11

12. Going Beyond Waste Management • Additional opportunities exist when drinking water infrastructure is also considered: • Energy efficiency and process optimization improvements can reduce operating costs • Water conservation measures can result in the need to produce less drinking water and treat less wastewater • Improved metering and optimized treated water recovery can help limit unaccounted for water use and improve revenue generation • Wastewater effluent reuse and sewer mining may create additional water sources for non-potable uses 10-3-12 Net Zero through Emerging Technologies 12

13. Energy Savings Performance Contracts • Energy and Security Goals require action now • Energy Savings Performance Contracts (ESPCs) offer a way to leverage future guaranteed savings to finance projects today • Approaching initiatives (energy management, water conservation, waste management and security) in a comprehensive manner may yield additional opportunities and allow more dramatic improvements to be realized 10-3-12 Net Zero through Emerging Technologies 13

14. Angela Hedgecock PE, CEM, LEED AP Siemens Industry, Inc. Building Technologies Division Alternative Energy Group, Project Developer Direct: (863) 937-6726 Fax: (866) 889-6403 Cell: (863) 512-1950 Angela.Hedgecock@Siemens.com 10-3-12 Net Zero through Emerging Technologies 14