stoneville uesc - energy exchange
TRANSCRIPT
Tampa Convention Center • Tampa, Florida
Stoneville UESC
Water Efficiency Project Case Studies
Sandy MorganUSDA Agricultural Research Service
August 16, 2017
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The Facility
• Stoneville MS is the location of a large USDA ARS laboratory where research is conducted in Cotton Ginning, Crop Genetics, Insect Management, Genomics/Bioinformatics, Biological Control of Pests, and Catfish Genetics.
• Stoneville is also home to ARS’ Southeast Area office.
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Determining the Scope
• The 103 buildings at Stoneville needed a lot of energy and water efficiency work. 340,000 SF
• It wasn't big enough for an ESPC so we explored a UESC with Atmos Energy.
• Atmos and their ESCO, ESG, put together a preliminary assessment.
• ARS asked them to incorporate a water recirculating project at the catfish hatchery that was studied several years earlier.
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Targeted Non-Potable Water ECM
• Industrial, Landscape and Agricultural Use (ILA) – Agricultural water uses:
• Animal watering• Aquaculture• Agricultural Irrigation
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The Water Conservation Needs
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• The catfish lab drew 1.3 million gallons of water per day from 1,100 foot deep wells and ran it through the fish tanks, single pass, then dumped it into a creek.
• Mississippi Department of Environmental Quality was issuing new water effluent requirements that Stoneville would not meet.
• Aeration tower was failing
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But just before award…
• USDA attorneys issued an opinion that UESCs could only have a 10 year term.
[Insert Lawyer Joke Here]
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• OMB issued a memorandum that UESCs had to have Performance Assurance and M&V.
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By the Numbers
• $4.2 million UESC award• Financed over 10 years• 3.63% interest• $582,000 Buydown + $51,638 for the IGA• Improved 51 buildings• There were 12 ECMs. We awarded 11. • 11 month design and construction period
– Extended 1 year• Saved 2,866,597 kWh of electricity, or 22%.
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Water Measures and Benefits
• Water Measures:– Bio-filtration/water recycling system– Plumbing fixtures
• Benefits:– Bio-filtration/water recycling system reduced non-
potable water consumption 338 Mgal/year (68% reduction)
– Reduced 7% of Agency non-potable water annually
– Improved water quality and met MDEQ permit– Plumbing fixtures saved 415,000 gallons/year
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Construction Phase Challenges
• The researchers replaced all of their tanks without telling anyone– ESCO sent a change order proposal
• The recirculation system designer was late getting under contract. Completion of the water conservation ECM was delayed. – The ESCO wanted the government to pay for the
2nd tier sub’s delay.
• Water temperature went down so propane heat had to be added.
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Finished Product
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Finished Product
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Stuff Happens
• The researchers observed two problems:– The fish were getting gas bubble disease from the
dissolved Nitrogen in the deep well water. • The existing CO2 stripper didn’t reduce Nitrogen• Need a degassing tower
– The fish tanks were building up pathogens from fish and eggs brought in from ponds
• Disinfection methods were not effective enough.• Need to reduce the amount of flow-through tanks.
• Never got the final M&V report – But good interim report
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New Degassing Tower
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Thank You
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In the East they drink water and fight over whiskyIn the West they drink whisky and fight over water