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

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 Technologies2

Overview of Sector-wide Energy Use Net Zero through Emerging Technologies3

Facility Energy Use Net Zero through Emerging Technologies4 Biological Aeration39% Aerobic Digestion35% Pumping14% Lighting / Buildings6% Thickening / Dewatering3% Clarifiers2% Headworks1% Chlorination<1% 1 Water Environment Federation MOP 32 Energy Conservation in Water and Wastewater Facilities Appendix C Table C.2. Activated Sludge WWTP – 5 MGD.

Total Operating Cost Net Zero through Emerging Technologies5 Energy Staffing Solids Chemicals Maintenance 40% 30% 10% 15% 5%

6 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 Typical Cost Savings Opportunities Net Zero through Emerging Technologies

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

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

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

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

11Net Zero through Emerging Technologies 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 Benefits of “Re-thinking” Waste Management

12Net Zero through Emerging Technologies 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 Going Beyond Waste Management

13Net Zero through Emerging Technologies 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

14Net Zero through Emerging Technologies Angela Hedgecock PE, CEM, LEED AP Siemens Industry, Inc. Building Technologies Division Alternative Energy Group, Project Developer Direct: (863) Fax: (866) Cell: (863)