Energy Performance Contracting at Village Creek WWTP · 1 Texas Association of Clean Water...
Transcript of Energy Performance Contracting at Village Creek WWTP · 1 Texas Association of Clean Water...
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Texas Association of Clean Water Agencies
November 21, 2008
Energy Performance Contracting at Village Creek WWTP
Sebastian Fichera, City of Fort WorthMadelene Rafalko, City of Fort Worth
Peter Cavagnaro, Johnson Controls, Inc.
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Project Drivers
City Wide Effort to Comply with Legislation
SB12 (2007)Extended the SB5 Goal of reducing annual electricity consumption by 5% for 6 more years, from 2007-2012“Cost-Effective” Electricity-Based Energy-Efficiency Measures
State Energy Conservation Office (SECO)Annual Reporting Requirement continues, with 2007 as the new Baseline
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Project Drivers
Water Department
Long list of projects competing for limited capital
Decreasing operating budget
47% of City’s energy expenditures Water & Wastewater
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Traditional Municipal Project Delivery
Design– Studies– Design
Bid
Build– Construction by Contractors– Services During Construction by Engineer
Owner holds both contracts
Owner
Contractor Engineer
Energy Performance Contracting
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Alternate procurement mechanism:
Implement infrastructure improvements that reduce energy consumption, oroperating costs
Financed through municipal lease
Paid with savings
One Point of Responsibility by the Energy Services Company
Energy Performance Contracting
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City of Fort Worth PC to date
Resource Conservation Program managed through Department of Transportation and Public Works
Over $12-million of Improvements Installed
Over $9-million of Improvements in Construction
Over 100-City Facilities Included in Efforts
Energy Savings Performance Contract• $20-million Contract over 4-phases (2000 - 2010)• $2.4-million Annual Savings Guaranteed (first year)• Net 8.3-year Simple Pay Back
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Performance Contracting Process
Preliminary Analysis
PresentResults of
PreliminaryAnalysis
DetailedAnalysis
Share Information
Project Development Agreement
ContractApproval Implement Service
March 2007
September 2007
Final Engineering,Equipment
Procurement, & Scheduling
Financial Term DeterminesM&V Period(20-yr.max.)
Target ofMarch 2009
(3rd-Party Review Required by Law)
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Back River PC Project
Project Scope Digester Gas UtilizationDigester Recirculation Pump ImprovementHVAC Improvements Direct Digital Control/Ventilation OptimizationLighting ImprovementsWater Conservation
$1.8 Million in Annual Energy/Operational Savings $14.1 Million Generation Facility, Energy Conservation and Plant Improvements
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Digester Gas Production
Digester Gas to Combustion Turbine
1,115 KCFD
Digester Gas to Plant 1 KCFD
Digester Gas to Flares 24 KCFD
Total Gas Produced: 1,141 KCFD
2004 Data
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Village Creek DG Utilization
Since 1960’s DG powered generation & blowers
2000 - Replaced due to age & emissions
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Village Creek Power Generation
In FY02, the City’s wastewater plant began utilizing a gas-fired turbine-generator system to provide much of its electricity needs.
2 turbine generators
5.2 MW each
DG, LFG, NG
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Village Creek Electrical Loads
Average 7 to 8 MW– Aeration Blowers– Primary Effluent Pumps– Other pumping & Odor Control– Facilities
Low 5 to 6 MW– Periods of low flow
Peak 12 to 13 MW– When Trinity River high, plant must pump
treated water out
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Waste Heat RecoveryIncrease Digester Gas ProductionAeration ImprovementsSCADA UpgradeFacilities Improvements
– HVAC– Lighting– Water Conservation
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Facility Improvement Measures
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Waste Heat Recovery
Heat Recovery Steam GeneratorsRecover waste heat from combustion turbinesGenerate high pressure steam
Steam Driven BlowersIncrease standby capacity of plant
Supplemental Gas BurnerUse all DG to produce steam available for driving aeration blowers
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Increase Digester Gas Production
Digester ImprovementsClean DigestersRemove existing gas lancesInstall new VLM Mixers
Compatible Food WastePotential Sources Identified & Contacted
Waste Receiving StationTanks for drop off – equipped with mixingTanks and pumps for feeding to digesters
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N
< 100 FT >
CO
NC
EPTU
AL
LAYO
UT
FOR
VC
WW
TP C
O-D
IGES
TIO
NEN
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BLEND TANK
NEW ROAD
“BATCH” TANKS
FEED TANK
TANKS & PUMPS INSIDE
CONTAINMENT WALL
FEED LINE TO DIGESTERS
SLOPED TRUCK UNLOADING PAD
WITH CURBS
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1114
N
90’ Ø
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Aeration Improvements
Nitrification/DenitrificationAnoxic Reactors
Diffuser UpgradeFine Pore Diffuser System
Automated DO Control ImprovementsMost Open Valve Control TechnologyVariable Flow Control of Aeration Blowers
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N
< 100 FT >
2 FRP BAFFLES
AB #5 –OPERATING IN ANOXIC MODE
AB #4 – OPERATING IN AERATED MODE
NRCY PUMP & RETURN LINE
CO
NC
EPTU
AL
LAYO
UT
FOR
VC
WW
TP A
NO
XIC
ZO
NES
ENER
GY
RED
UC
TIO
N P
RO
JEC
T ---
JCI0
8364
2 COARSE BUBBLE AIR HEADERS WITH DOUBLE
SPIRAL ROLL
3 Ea: 5 Hp MIXERS, WITH WALKWAYS
AND ACCESS STAIRS
MIXERS OFF –(WALKWAYS NOT
SHOWN)
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HVAC ImprovementsReplace outdated and inefficient equipmentEquipment OptimizationHVAC Controls Implementation
Lighting ImprovementsReplace or retrofit existing inefficient fixturesLighting Controls
Water Conservationfixtures
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Facilities Improvements
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$ 3,335,000
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$ 2,936,000
$ 637,000
Annual Utility Cost Avoidance
Annual Additional Revenues
Net-Total Annual Cost Avoidance
($ 238,000)Annual O&M Cost Avoidance
Projected Benefits
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$19.1 million
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$ 2.7 million
$5.0 million
Aeration Diffuser Upgrade
Digester Gas Improvements
Total Cost
Anticipated Cost
$3.6 millionTurbine Waste Heat Recovery
$0.8 millionAnoxic Zones
$7.0 millionSCADA Improvements
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Village Creek Development Team
Fort Worth Transportation and Public Works
Fort Worth Water
Village Creek Wastewater Treatment Plant
Johnson Controls, Inc.
Vic Weir Consulting
Freese & Nichols
AECOM
CDM