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OBG and the City of Ithaca PRESENTS:
Ithaca Commissions New Membrane Filtration Plant
Matthew Sledjeski, P.E. & Richard Gell, P.E.
AGENDAWhy Rebuild?
Procurement Strategy
Construction Phasing Considerations
The Constructed Facilities
Performance Benefits Achieved
Anticipate Change
Lessons Learned
Acknowledgements
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Why Rebuild the Existing Water Treatment Plant?
Rebuild Benefits
Preserves the reliability of
three sources
Avoided energy use of over 1,300,000
KwH/yr.
Avoided risky pipeline
construction along NYS Highway
Preserves control of water
supply
Why rebuild on the same site?
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Community perception that the natural area created as a result of the water supply was sacred ground
100 years of development left no other practical option
Overall Plant Procurement Strategy
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City retains OBG as program manager
Side by side piloting of membrane vendors
Plant designed based on piloted vendors
Pall Corp awarded bid for membranes
Adaptive changes made to design and Construction contracts issued
1. Complete system reliability upgrades
2. Construct pretreatment processes
3. Construct Upper membrane room
4. Construct balance of plant
Overall Construction Phasing
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Step 1
Step 2Step 3
Step 4
System Reliability Upgrades
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Construct residuals handling facility
Restore 1.5 MG of operational storage Interconnection with Bolton Point system
Project Elements That Minimized Reliance on Plant Production
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Water quality benefits
Reliability benefits
Restored use of an idle asset
New pump station increased usable storage by 1.5 MG
Repair of identified leaks reduced demand by 1.5 MGD
Mechanical sludge dewatering facility eliminated scheduling constraints for settling basin cleaning
Existing Tank
New Pump Station
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New Residuals Handing Facility
New residual handling with volute press eliminated manual lagoon cleaning.
Plant Construction Phasing
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After the off-site facilities was constructed, the plant was completed in three basic phases:
Phase 1 included demo of the original settling basin and constructing new pre-treatment facilities and electrical room
Phase 2 included construction of the Upper membrane filtration system and temporary CIP system
Phase 3 included the balance of plant demolition and re-construction
Buried Sed. Basins Replaced With Plate Settlers and Automated Sludge Collection
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City Selected Rebuild Option Over Renovation
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“A rebuild will be like trying to fix dinner while you’re remodeling the kitchen.”
William Gray, retired Superintendent of Public Works,
Media Filters Replaced With Pall Membrane Microfilters
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Circular charts replaced with master control system
Operators can monitor and control the plant, distribution system, and building systems from one central location
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New Chemical Storage and Feed Systems
▪ Sodium permanganate at intake
▪ Chlorine dioxide at plant raw water
▪ Polyaluminum chloride
▪ Phosphate corrosion inhibitor
▪ Sodium hypochlorite
▪ Sodium hydroxide for pH control
▪ Membrane CIP
Separation of chemicals and flow pacing enhance operations and safety
ELAP certified lab with dedicated space for process control testing
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Wet chemistry, ELAP certified microbiological testing, USGS watershed monitoring
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Other Plant Features
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Operational Benefits achieved
System automation provides tools for improved process control
Automated sludge collection eliminated manual cleaning
Membrane filters eliminated manual filter backwashes
Eliminated vulnerability from antiquated facility
Performance Benefits Achieved
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2011 2017
Settled water turbidity
<5 <1
Filtered water turbidity
0.1 0.02
Raw water flow
4.0 2.4
Finishedwater flow
2.5 2.2
Project was completed within budget!
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Original Contract Final
Water System Improvements $1,950,000 $1,929,207
Residuals Handling $4,482,000 $4,462,917
Membrane Equipment $3,122,969 $3,122,969
Water Treatment Plant $17,577,209 $17,853,647
Clearwell Replacement Not Included $1,100,458
Control System Integration $500,000 $685,000
Engineering $4,250,000 $4,785,000
Other Project Costs Not Included $1,060,202
Contingency $4,487,822 Not Included
Total Project Cost $36,370,000 $34,999,400
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Self graded LEED score of 45 points
Existing materials crushed and used on site
High Efficiency Building Envelope & Energy Management
Provisions for P.V. and Hydro-electric
Compliance with Design and Construction Principles LEED Building
Anticipate Construction Challenges and Unforeseen Conditions
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Temporary cross-ties in sed. basin
Variable soil conditions
Inoperable valves
Wood piling left in place
Pretreatment key to membrane performance
Expect Project delays
Beware of manganese interference with DPD tests
Lessons Learned
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“I feel like we now have the tools to make great water.”
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Nate Carman, Operator
AcknowledgementsCity of Ithaca Staff
Watek Engineering
Pall Corporation
Welliver McGuire, Inc.
Schuler- Haas Electric Corp.
Kimble, Inc.
Ackerman Plumbing, Inc.
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QUESTIONS
