Wastewater Facilities Byron Lloyd Public Sector Energy Advisor - - PowerPoint PPT Presentation

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Wastewater Facilities Byron Lloyd Public Sector Energy Advisor - - PowerPoint PPT Presentation

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Energy Efficiency and Incentive Programs for Wastewater Facilities Byron Lloyd Public Sector Energy Advisor February 14, 2018 Agenda Energy Consumption in WWTP Energy Efficiency Opportunities for WWTP Incentive Programs for Public

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Energy Efficiency and Incentive Programs for Wastewater Facilities

Byron Lloyd Public Sector Energy Advisor

February 14, 2018

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Agenda

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  • Energy Consumption in WWTP
  • Energy Efficiency Opportunities for WWTP
  • Incentive Programs for Public Wastewater Facilities
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SLIDE 3

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Energy Consumption in WWTP

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Energy Consumption in WWTP

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  • Providing safe drinking water

and reliable wastewater services requires a substantial amount of energy

  • Enormous potential to reduce

energy use without compromising quality standards

  • Shorter paybacks than industrial

counterparts due to longer hours

  • f operation

Wastewater Industry Energy Consumption

  • 3% to 4% of U.S. energy

consumption is used for drinking water and wastewater services

  • 35% of a typical municipality

energy budget is for water and waste water treatment

  • 25-40% of a typical WWTP
  • perating budget spent on

electricity

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Energy Consumption Breakdown in WWTP

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Energy Efficiency Opportunities for WWTP

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Energy Efficiency Opportunities for WWTP

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  • Aeration
  • Wastewater Pumping
  • Anaerobic digestion
  • Lighting and Buildings
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Energy Efficiency Opportunities for WWTP

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  • Aeration
  • Wastewater Pumping
  • Anaerobic digestion
  • Lighting and Buildings
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Aeration

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  • Optimize Aeration System
  • 20-75% typical energy savings of unit of process
  • 1-5 years typical payback
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Bubble Types

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Fine Bubble Coarse Bubble

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Aeration

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  • Variable Blower air Flow Rate
  • Blower Control: Provide the Correct Air Flow
  • Control Technique Varies With Type of Blower
  • Positive Displacement Blowers with VFD
  • Multistage Centrifugal Blowers with VFD or Inlet valve throttling
  • Single Stage Centrifugal Blower inlet guide-controlled
  • Turbo blower with VFD
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Aeration

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  • Variable Blower air Flow Rate
  • 15-50% typical energy savings of unit of process
  • <3 years typical payback
  • Applies to all aeration systems
  • Activated Sludge
  • Aerobic Digestion
  • Channel Aeration
  • Post Aeration
  • Aerated Grid
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Aeration

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  • Automatic Dissolved Oxygen Control
  • Monitor and maintain the dissolved oxygen concentration

level at a preset control point by varying the air flow rate

  • Variable Flow may be provided Through the use of VFDs
  • 20-50% typical energy savings of unit of process
  • 2-3 years typical payback
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Aeration

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  • Automatic Dissolved Oxygen Control
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Aeration

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  • Blower Technology Options
  • Blower Technology Continually Evolving
  • Blowers are increasingly Energy-Efficient
  • Things to be considered
  • INITIAL COST
  • EFFICIENCY
  • TURN-DOWN CAPABILITY
  • REPAIR & MAINTENANCE
  • 10-25% typical energy savings of unit of process
  • 1-7years typical payback
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Aeration

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  • Blower Technology Options
  • Positive Displacement Rotary lobe blowers
  • Low initial cost
  • Low Efficiency
  • High Turn down Ratio
  • Moderate to Considerable Repair/Maintenance
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Aeration

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  • Blower Technology Options
  • Turbo blowers
  • Higher initial Cost
  • Higher efficiency
  • Limited Turn Down Ratio
  • Minimal Repair/Maintenance
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Aeration

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  • Blower Technology Options
  • Positive Displacement Hybrid rotary lobe-screw blowers
  • High initial Cost (Lower than Turbo Blowers)
  • High efficiency (Lower than Turbo Blowers)
  • High Turn Down Ratio (Comparable to Rotary Lobes)
  • Moderate to Considerable Repair/Maintenance
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Energy Efficiency Opportunities for WWTP

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  • Aeration
  • Wastewater Pumping
  • Anaerobic digestion
  • Lighting and Buildings
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Wastewater Pumping

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  • Install High efficiency Motors and Pumps
  • Typical Max. Eff. Pump: 70%
  • Typical Max. Eff. Motor: 90%
  • Worst Case Pump: 40%
  • Worst Case Motor: 85%
  • 5-10% typical energy savings of unit of process
  • <2 years typical payback
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Wastewater Pumping

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  • Variable Frequency Drive Applications
  • VFDs Match Motor Output Speed To specific Load
  • Can Replace Throttling Valves
  • 10-40% typical energy savings of unit of process
  • 0.5-5 years typical payback
  • Reduce Peak Demand Charges
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Energy Efficiency Opportunities for WWTP

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  • Aeration
  • Wastewater Pumping
  • Anaerobic digestion
  • Lighting and Buildings
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Anaerobic digestion

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  • Bio-solid Mixing Options
  • Anaerobic Digestion is Highly Dependent Upon Effective

Sludge Mixing

  • Could Represent Approximately 10-15% the Energy Use in a

Wastewater Treatment Facility

  • Three Types:
  • Gas Recirculation
  • Pumped
  • Mechanical
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Anaerobic digestion

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  • Bio-solid Mixing Options - Vertical Linear motion mixing
  • Use Vertically Oscillating Disc
  • 50-90% less power than traditional methods
  • Variable Payback (2-16 Years)
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Anaerobic digestion

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Bio-solid Mixing Options - Jet mixing

  • One or more internally or externally mounted pumps deliver a

recirculated flow into a series of nozzles.

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Anaerobic digestion

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  • Bio-solid Mixing Options - Jet mixing
  • Power Savings of up to 50% or More
  • Reduced maintenance costs
  • Significant Reduction in Tank Cleaning Costs
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Energy Efficiency Opportunities for WWTP

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  • Aeration
  • Wastewater Pumping
  • Anaerobic digestion
  • Lighting and Buildings
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Lighting and Buildings

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  • High-Efficiency Lighting and Advanced Controls
  • Light Emitting Diode (LED)
  • Energy-Efficient Fluorescent Lighting
  • Multi-Level Lighting controlled by
  • Motion
  • Ambient Day Light
  • Timers
  • Combination of above
  • 10-30% typical energy savings of unit of process
  • <4 years typical payback
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Lighting and Buildings

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  • Existing HVAC Systems Replacement or Recommissioning
  • Recommissioning: Overall evaluation and adjustment of the

system to ensure is operating properly and to design conditions

  • Several opportunities for replacement: Variable Refrigerant Flow

(VRF) Systems, Condensing Boilers, Energy-Efficient Unitary Systems, Energy Star Windows Units, etc

  • Variable Payback and Energy Savings:
  • Recommissioning can provide savings in operational, maintenance

and utility cost, and energy savings of 10-20%

  • Simple Payback depends on size and condition of the existing

equipment

  • 4-8 years for replacement projects
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Lighting and Buildings

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  • Install VFD Control on Air Compressors
  • Rotary Screw Air Compressor with Inlet Modulation with

unloading is Highly Inefficient, Requires About 20% of the Load in Unloading Mode

  • VFDs on a Rotary Screw Air Compressor Widely

Implemented by the Industry

  • Save energy Especially in Part Load Operation
  • Payback and Energy Savings Depend on the Operating

Hours and Size of the Compressor

  • Leak repair, reduce system pressure set point, tank

storage with flow controller

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Incentive Programs for Wastewater Facilities

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Ameren Illinois Energy Efficiency Programs

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  • Public Wastewater facilities as part of the public sector

can take advantage of a number of cash incentives to improve the energy efficiency of the plant and reduce energy use.

  • Two primary types of incentives
  • Standard (prescriptive) – pre-determined incentive
  • Custom – incentive based on energy saved
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Ameren Illinois Energy Efficiency Programs

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  • Standard Incentive(prescriptive measures )
  • Lighting (Interior and Exterior LED, Lighting Controls, LED Exit

Signs)

  • HVAC (Water Heaters (electric/gas), Chillers, Furnace

Replacements, Boiler Replacements, Programmable and Advanced (Smart) Thermostats, Demand Controlled Ventilation)

  • Variable Frequency Drive
  • Specialty Equipment (VFDs Controlling Air Compressor Motors)
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Ameren Illinois Energy Efficiency Programs

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  • Custom Projects
  • Any other projects that reduce energy consumption,

including unique projects at WWTP

  • $0.08/kWh saved annually (non-lighting)
  • $0.07/kWh saved annually (lighting)
  • $1.20 therm saved annually
  • Up to 60% of the Project Cost
  • All custom projects require pre-approval
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Ameren Illinois Energy Efficiency Programs

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  • Other Incentives
  • New Construction
  • Retro Commissioning
  • Feasibility Study
  • Metering and Monitoring
  • Pre-approval required for these project types
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Other potential funding sources for WWT projects

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  • Environmental Protection Agency (IEPA)

http://www.epa.illinois.gov/topics/grants-loans/state-revolving-fund/index

  • Illinois Clean Energy Community Foundation (ICECF)

https://www.illinoiscleanenergy.org/energy-program/net-zero-energy- wastewater-treatment-plants

  • United States Department of Agriculture (USDA)

https://www.rd.usda.gov/programs-services/water-waste-disposal-loan- grant-program/il

  • U.S. Department of Energy (DOE)

https://www.energy.gov/eere/amo/sep-water-wastewater-pilot-project

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Ameren Illinois Contact

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  • Byron Lloyd
  • Public Sector Energy Advisor
  • Ameren Illinois Energy Efficiency Programs
  • 309.433.4316
  • harvey.lloyd@leidos.com
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Ameren Illinois Business Program Energy Advisors Call 1.866.800.0747 to request a consultation with an Energy Advisor

  • 1. Chad Whitehead

Chad.Whitehead@gdsassociates.com 309.620.6333

  • 2. Steven Smith

Steven.L.Smith@leidos.com 309.212.5831

  • 3. Rod Rhoads

Rod.Rhoads@gdsassociates.com 217.649.8897

  • 4. Mark Steinmetz

Mark.Steinmetz@gdsassociates.com 217.670.9606

  • 5. John Strode

John.Strode@gdsassociates.com 309.370.0062

  • 6. Mike Thompson

Michael.E.Thompson@leidos.com 309.213.0336

  • 7. Larry Erwin

Lawrence.F.Erwin@leidos.com 309.838.2340

BUSINESS PROGRAM ENERGY ADVISORS

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