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

Wastewater Treatment or Resource Recovery:

Maximizing the Energy Potential of Your Infrastructure

Angela Hedgecock, PE, CEM, LEED APSiemens 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

10-3-12 Net Zero through Emerging Technologies 2

Overview of Sector-wide Energy Use


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.

Total Operating Cost

10-3-12

Net Zero through Emerging Technologies 5

Energy

Staffing

Solids

ChemicalsMaintenance

40%

30%

10%

15%5%

10-3-12

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 610-3-12

7

Conventional Approach to Waste Management


Pumping Wet Stream Treatment

SolidsSolids Handling and Dewatering

Surface Water/ Groundwater

Wastewater Collection

Landfill

Effluent

Solids

Municipal Solid Waste (MSW)

8

Anaerobic Digestion Provides Benefit



SolidsAnaerobic Digestion



Landfill

Effluent

Reduced Solids

Biogas for Beneficial Reuse:-Digester Heating-Cogeneration-Sludge Drying

9

Hauled Wastes Improve Feasibility for Small Plants






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






Landfill

Effluent

Further Increase to Biogas Production

Food Waste

Reduced Organics in MSW

Potential Increased Revenue through Tipping Fees

11Net Zero through Emerging Technologies 1110-3-12

• 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


• 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


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


Angela HedgecockPE, 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

[email protected]

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

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