Energy and WaterWastewater Treatment Engineering and Design Perspective Water Innovations Michael Di - PowerPoint PPT Presentation

Title: Energy and WaterWastewater Treatment Engineering and Design Perspective Water Innovations Michael Di


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Energy and Water/Wastewater TreatmentEngineering
and Design PerspectiveWater InnovationsMichael
Dimitriou AWWAJim Fisher , City of San
DiegoDarren Hollifield and Michael Esner
JEALarry Jentgen EMA
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Energy represents a substantial and rising cost
to water and wastewater utilities. - In recent
survey of Utility Directors, energy cost was
rated as one of the top five long term
concerns- Many Utilities implementing energy
management and cost control programs.- New
technologies in Drinking Water treatment are more
energy intensive- In Wastewater treatment,
older conventional technologies are given way to
lower energy options
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Technology Shift Increasing Energy CostNew
technologies required to deal with tighter water
quality standards and water scarcity are higher
in energy consumptionIn water Ultra and
Micro Filtration Desalination using Reverse
Osmosis Ultraviolet disinfection Ozone
disinfection
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Technology Shift Increasing Energy
CostWater/Wastewater reuse is growing also
increasing use of energy intensive
technologies Membrane Bioreactors
Reverse Osmosis Ultra and Micro
Filtration Ultraviolet disinfection
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Reuse of Wastewater allows us to use water wisely
and more effectively but can result in an
additional 20-40 increase in energy use over
conventional treatment methods
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Ultra and Micro Filtration Membranes Treat Water
or Wastewater resulting in high quality effluent
but increase energy use by 10
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Ultraviolet and Ozone Provide High Levels of
Water Wastewater Treatment
PRODUCT
Process Water
Drinking Water
Wastewater
Drinking Water
Ozone and UV provide Significant water Quality
Benefits but consume from 100 to 400 more
energy than Traditional treatment methods
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Reverse osmosis is and effective method for
desalting sea water and Reuse of wastewater, but
requires 500 more energy than conventional water
or wastewater treatment
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Energy Management must be System Wide

• In Many cases, utilities must balance water
  quality needs with energy and other operating
  costs
• This includes introducing new more energy
  intensive technologies
• But also requires the proper management of the
  entire treatment process from transport, to
  treatment to distribution to maximize efficiency

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Recommendations for an Effective Energy
Management Program

• Factor Water Quality Water Supply into an
  Energy Optimization Program
• Like Most Initiatives, Successful Energy
  Management Depends on Good People
• Energy Management is a Cultural Thing
• Significant Quick Wins Can Be Achieved with Minor
  Organizational Change and New Business Practices
• Consider Supply and Demand in Your Energy
  Management Program

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Recommendations for an Effective Energy
Management Program

• In Many Cases, Largest Savings Come Through
  Real-Time Optimization Using SCADA
• Diligence in Operations is Required for
  Continuous Improvement in Energy Management
• Energy Management is a Continuous Operational
  Process
• Setting Tracking Goals is Key to Successful
  Energy Management
• Reliability of Supply is a Significant Factor in
  Energy Management

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Goals for Optimally Controlling the Water System
in Real-time

• Maximize the Value of Energy
• Better Manage Groundwater Supplies for Future
  Generations
• Minimize Chemical Costs
• Monitor Water Quality in Real-time
• Minimize/Differ Capital Costs Through Better
  Utilization of Existing Assets

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A Simple Way of Reducing Energy Costs

• Review the power rate for each station.
• Reduce demand charges.
• Know when the station power meter is read.
• Dedicate a staff member to monitor the power
  bills.
• Take advantage of time-of-use metering.

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Additional Consideration for Reducing Power
Consumption

• Analyze pump stations for pressures, flows, and
  storage requirements for peak operational demands
  and fire/emergency requirements.
• An opportunity may exist for reducing the storage
  if there is excessive storage.
• The impeller can be trimmed if there is surplus
  pump discharge pressure.
• It may be more cost effective to install soft
  starts or VFD (variable frequency drives) at
  major power users.

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Prepare Process Model That Defines the
Organizational Processes

• Develop and Account for Energy Costs
• Forecast Water Demand
• Optimize Water Supply
• Develop Water Treatment Plant Schedule

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Prepare Process Model That Defines the
Organizational Processes

• Operate Pumps and Valves to Minimize Energy Costs
  Use
• Develop the System Operating Plan
• Measure System Performance, Respond to Events and
  Update the Plan

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Resources and Tools -Optimization Tools

• Water Supply Analyzer
• Pump/Valve Optimizer and SCADA Modifications
• Energy Cost Scheduler
• System Mass Balance Simulation and Performance
  Monitoring

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