milwaukee - resource recovery - sustainable water reclamation (sewer)
TRANSCRIPT
Urban Water Sustainability Leadership Conference, 2011 Clean Water America Alliance
Resource Recovery: Sustainable Water Reclamation (SeWeR)
Milwaukee Metropolitan Sewerage District
Tim Bate, PE, Director of Planning, Research & Sustainability
Karen Sands, AICP, Manager of Sustainability
Words Matter
A vocabulary of truth and
simplicity will be of service
throughout your life.
-Winston Churchill
Our Talk Today
•MMSD Background
•Visions for the Future
•Energy at MMSD
•Resource Recovery at MMSD
• Regional Agency
• Established by State Law
• Provide water reclamation and
flood management
MMSD Sewers
Municipally Owned Sewers
Private Laterals
Water Pollution Abatement Program (WPAP)
• Treatment Plant Upgrades
• ISS (a.k.a. Deep Tunnel)
• Sewer Rehabilitation
A $3 billion investment
Below Ground
Gallons of Storage
Long
In Diameter
The Deep Tunnel has kept
91 Billion Gallons of pollution out of Lake Michigan
A Path to the Future
MMSD 2035 Vision’s Strategic Objectives
1. Integrated Watershed Management
a) Zero CSOs and SSOs
b) Integrated management of urban and rural stormwater
2. Climate Change Mitigation/Adaptation with an
emphasis on Energy Efficiency
a) Use 100% renewable energy sources, with 80% being
self-produced
b) Reduce MMSD's carbon footprint by 90% from its
2005 baseline
Current MMSD Energy Situation Summary
• Energy costs are significant to MMSD
• MMSD has significant carbon footprint
• Natural gas is most significant energy source:
• Financially
• BTUs
• Carbon footprint
• Reductions in energy use can save money
JI Natural Gas
Energy at MMSD
• Purchased Energy
• Produced Energy
From Effluent
Other On Site
Purchased Energy • Energy Budget (2011): ~$13M
• 16% of O&M budget
• By Cost: 70% gas, 30% electricity
• By BTU: 90% gas, 10% electricity
• Total BTUs purchased at WRFs is
~10,000 Wisconsin residential homes
Produced Energy
• From Treatment Process Waste Heat
Biogas
• Onsite Solar PV
More Solar + Wind on the Horizon…
Produced Energy From Effluent Process
Waste Heat: JI Turbines:
Natural Gas to Electricity
Biogas: SS Digesters + Engine
Generators: Biogas to Electricity +
Heat
Waste Heat
• Turbines are source of waste
heat
• Saves on purchase and use of
natural gas in solids drying
• Generates electricity instead of
purchase
South Shore WRF Biogas • BioGas converted to electrical power by Engine
Generators
• Air Used in Secondary Treatment
• Heat Used in Digestion Process
•Biosolids can be Transferred via 11-mile Pipeline
Future: MMSD Landfill Gas Project • VES Owns Emerald Park Landfill (EPL)
in Muskego, 15 Miles from JIWRF
• Agreement: MMSD + VES
• 16” LFG Pipeline from EPL to JIWRF
• Replace existing NG turbines with
turbines capable of burning LFG
Initially 3 turbines, up to 2 more
• Save $ & Reduce Carbon Footprint
• Gas Now Flared Off
• Total Pipeline Cost ~ $43M
LFG Turbines
• New Turbine building
• 3-5 Solar Mercury 50, 4.8 MW
Turbine-generators
• High Efficiency, Low Emissions
• Lower Temperature Exhaust
• Need to Heat Dryers Using NG,
Along with Using Waste Heat
from Turbines
• Total Cost: $61.5M
Produced Energy
•From Effluent Process •Waste Heat
•Biogas (now & future)
•Onsite •Solar PV
•More Solar + Wind on the Horizon…
Solar PV
•20 kw: Rooftop of D&D Building
•Produced 93,324 kWh
Website: http://view2.fatspaniel.net/PV2Web/merge?&view=PV/standard/Simpl
e&eid=189343
Maximize Use of Renewables
• Landfill Gas
• SS Digester Thickening & Mixing, Co-digestion
• Regional Biosolids/High Strength Waste
• Excess “waste” heat
• Sewer Thermal
• Solar, Wind
• Renewables Project Gap
Minimize Energy Use (Conservation/Technologies) • Energy Management and Controls
• JI Turbines
• Hybrid Fleet Replacement
• Water Conservation (complete)
• HVAC Upgrade (complete)
• Lighting (complete)
• JI Aeration AFP, Aeration/Blowers
• SS Aeration Optimization
• Conservation Project Gap
Nutrient Recovery at MMSD
• Milorganite
• Future
Trading
Other?
Milorganite: A True Original
• Developed in 1926 by Dr. O.J. Noer
• Originally: Commercial Turf & Vegetable
• Milorganite has been a Mainstay in the Turf Industry
for 85+ Years
• MMSD: One of the Nation’s Oldest Recyclers
What is Milorganite?
• Milorganite is Derived from Dried Microbes
• Iron is Added in the Treatment Process
• Iron Becomes Organically Complexed to Microbes
• Dried at 1,200º F for Over 30 Minutes
• Daily and Weekly Laboratory Analysis to
Guarantee Safety and Nutrient Analysis
Benefits of Milorganite
• Non-burning
• Eco-friendly
• Safe for Kids and Pets
• 4% Iron for Deep Greening
• Slow Release Nitrogen
• Can be Used Everywhere
• Inexpensive Organic
Paradigm Change Industry-Wide
• Words
Stop Saying “Waste”
Start Saying “Resource”
• Goals
Energy Independence
Resource Recovery
How We Talk About This Matters!!!!!
Extra slides below…insert them wherever (and if) they make sense.
END HERE!!!!!
LFG Project Roles MMSD:
• Design, Construct, Own & Operate 16”
LFG Pipeline from EPL to JIWRF
• Replace existing NG turbine with turbines
capable of burning LFG
Includes a major building addition
Initially 3 turbines, up to 2 more
VES:
• Design, construct, own and operate LFG
treatment and compression system
LFG Pipeline
• 16” Diameter
• 19 Miles Long
5.6 Miles Convert Steel Pipe
13.3 Miles New HDPE
• <100 psi
• Total Cost: ~$43M
2009 Green Energy
Solar Power
Methane
$800,000
Gas
http://v3.mmsd.com/Sustainability.aspx
Landfill Gas -to- Green Power Greenhouse Gas Reduction
500,000 Tons Customer Savings
$10’s of Millions
Existing JI Combined Heat and Power Process
Natural Gas
2-15 MW Natural
Gas Turbines and
Generators Electricity for Plant Needs
(wet weather, 24 hours/day, 5
days/week
Waste heat to
Milorganite dryers WE Electricity, dry
weather,
weekends
Excess waste heat
Natural Gas (when not using turbines
LFG Purchase Contract and Financials
• Full start up in January 2013
• 20 year contract to purchase LFG at 48% of NYMEX
• Net savings: “$10’s of millions”
– Actual savings dependent upon NG price and actual quantity of LFG
LFG Supply
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MM
Btu
Year
Projected MaximumGuaranteed Minimum
3 Turbines
5 Turbines
Jones Island Stationary Combustion Sources Before and After Landfill Gas Project (based on 2007 fuel usage data)
GHG Emissions in Metric Tons of Equivalent CO2
~95% Reduction
Other Projects With Significant $ Savings
• Jones Island Aeration
– High efficiency blowers
– Up to $600K/year savings
• South Shore Process Control
– Control blowers via ammonia and DO probes
– Up to $200K/year savings
• Digester Mixing
– Increase SS digester gas production
– Up to $800K/year savings
Combined Heat and Power Process with Landfill Gas
Electricity for Plant Needs,
Waste heat to
Milorganite dryers
Excess waste heat
3-5 4.8 MW gas
turbines
Natural Gas
Natural Gas
Landfill Gas
Purchase
electricity if not
enough LFG
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