the value of benchmarking: wastewater treatment · • waste, water, energy assessments • source...
TRANSCRIPT
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The Value of Benchmarking:Wastewater Treatment
Jon Vanyo C.E.M.Minnesota Technical Assistance Program
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Overview
MnTAP Background
Value of Benchmarking
Types of Benchmarks
Energy Savings Strategies
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MnTAP Background
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• State-wide, non-regulatory, no-cost, confidential technical assistance to Minnesota industrial businesses
• waste, water, energy assessments• source reduction opportunities• grant project scoping• confidential regulatory questions
• Technical staff with backgrounds in engineering, science and industry with a passion for efficiency and the environment
Minnesota Technical Assistance Program
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Special Project - Wastewater FacilitiesObjective: Improve WWTP energy efficiency through• Benchmarking• Site assessments• Implementation• Intern projects• Renewable energy
assessments (CHP)
http://www.mntap.umn.edu/POTW/wwtp.html
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Value of Benchmarking
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Benchmarking makes energy efficiency known.
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Benchmarking makes energy efficiency visible.
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High benchmark scores are deserving of recognition.
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Low scores can justify efficiency improvements.
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High or low...
You can leverage your score to benefit your facility.
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Benchmarking results in cost savings;
MnTAP’s energy assessments averaged implemented savings of $13,000 per plant per year.
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Benchmark scores help, but plant operators and managers are the efficiency champions.
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Find energy efficiency relative to your peers.
Leverage that number into projects and upgrades that will make your plant more efficient and more effective.
Value Summary
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Types of Benchmarks
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Hydraulic Flow Benchmark
BOD Load Benchmark
ENERGY STAR Portfolio Manager Benchmark
Types of Benchmarks
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Hydraulic Flow Benchmarking (kWh/MG)Plant energy consumption per unit flow
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Hydraulic Flow Benchmarking (kWh/MG)
1500 kWh/MG5000 kWh/MG
Hydraulic Flow Score Range
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BOD Benchmarking (kWh / kg BOD)
Plant energy consumption per unit BOD removed
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BOD Benchmarking (kWh / kg BOD)
1.5 kWh / kg BOD5 kWh / kg BOD
BOD Load Score Range
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ENERGY STAR® Portfolio Manager (ESPM)
Energy ConsumptionFuel ConsumptionFlowBOD Removal
ClimateNutrient RemovalTrickle Filter
Energy Efficiency as a Percentile Rank
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ENERGY STAR® Portfolio Manager (ESPM)
1001
ENERGY STAR Score Range
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ENERGY STAR® Portfolio Manager (ESPM)
ENERGY STAR scores were developed using data from plants with flows over .6 MGD.
Smaller plants can calculate unofficial scores which are useful, but less accurate.
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Energy Savings Strategies
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• 11 Wastewater Plants
• $450,000 in recommended annual energy cost savings
• $150,000 in annual energy savings implemented to date
• $13,000 per site average
MnTAP Project Background
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Is your secondary aeration basin running at over 2 ppm DO?
Secondary Aeration DO
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Secondary Aeration DO
$0
$2,000
$4,000
$6,000
$8,000
$10,000
$12,000
$14,000
$16,000
$18,000
8ppm
7ppm
6ppm
5ppm
4ppm
3ppm
2ppm
Elec
tric
al co
st ($
/yr)
DO concentration
Aeration Energy Costs at DO Levels
$12,100
$600
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Reduce blower speed by reducing VFD frequency (if possible).
Cycle equipment on and off to reduce average aeration
(using mixers during off time as needed).
Get a smaller blower that can efficiently maintain lower DO.
Secondary Aeration DO
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Aerobic Digester Aeration
Is there opportunity to reduce aerobic digester aeration?
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Aerobic Digester Aeration
The Ten State Standards recommends
30 scfm / 1000 ft3.
Many sites can run even lower.
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Aerobic Digester AerationReduce blower speed by reducing VFD frequency (if possible).
Cycle equipment on and off to reduce average aeration.
Get a smaller blower that can efficiently meet air requirements.
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Aerobic Digester Detention Time
Is there opportunity to reduce
aerobic digester detention time?
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Aerobic Digester Detention Time
Ten State Standards mentions a
27 day detention time basis.
Some sites can run lower than this.
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Aerobic Digester Detention Time
Ensure waste is stabilized with SOUR testing.
Reducing detention time will also reduce aeration requirements, allowing you to use less energy.
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Anaerobic Digester
Consider Combined Heat and Power (CHP)
This study found simple payback periods ranging from 4-10 years.
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http://www.mntap.umn.edu/industries/facility/potw/energy/
Share the benefits of these successful projects.
Case Study Examples
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The magnitude of these opportunities is expected to correlate with benchmark score.
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Jon Vanyo C.E.M.Associate EngineerMinnesota Technical Assistance Program612-624-4683, [email protected]
Benchmarking is the first step towardsefficient wastewater infrastructure.