jie li, b.s. jessica schiff, b.a. sarah brengman ken gilbertston, phd ened 5325 environmental issues...
TRANSCRIPT
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Jie Li, B.S.
Jessica Schiff, B.A.
Sarah Brengman
Ken Gilbertston, PhD
EnEd 5325 Environmental Issues Investigation
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OverviewIntroductionProblem ID and DefinitionImpact Evaluation CriteriaGlobal DataLocal DataImpactsRecommendationsConclusion
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IntroductionSports and Health Center (SpHC) built in 1953
46,000 ft²6:30 a.m.-midnight(until 10 p.m. in summer
months)Six-lane swimming poolTherapy pools Multiple locker roomsFull-sized ice rinkVarious restroom facilities and drinking fountainsDraws water from City of Duluth water supply
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Problem ID and DefinitionPotential overuse of domestic water consumption in
SpHC. Can this amount be reduced? If so, how and how much? If not, why not?
Domestic water: Treated water that comes in contact with humans to support everyday life
Water consumption: Any and all domestic water used in SpHC (may or may not be returned to the Earth’s water cycle)
To waste water: To use, consume, spend, or expend water thoughtlessly, carelessly, or purposefully (The American Heritage Dictionary, 2009)
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Background to Problem
2025: The anticipated year for world-wide water shortages (waterfootprint.org)
Lake Superior = 20% of world’s fresh surface water
Figure 1: Distribution of Earth's Water (USGS, 2009).
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Impact Evaluation Criteria“Water efficiency is the long-term ethic of
saving water resources through the employment of water-saving technologies and activities” (EPA)
Determine baseline water requirements needed for SpHC to function
Determine if more than this baseline amount of water is being used
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Global DataGlocal: Thinking globally and acting locallyWorldwide water uses: Agricultural, Industrial,
Domestic
Figure 4: Average per capita domestic consumption from different nations (WBCSD, 2009).
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Global ImpactsCase Study: Aral Sea
Environmental ImpactsEconomic ImpactsSocial Impacts
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The Aral SeaAn example of a shrinking lake:Uzbekistan and Kazakhstan26,254 mi2
Now 10% of original size 2,625 mi2
Impacts: Economic-fishing industry, shift in job marketSocial-shift in job market, sources/uses of waterEnvironmental-salinity changes, loss of natural
body of water
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Local Data and ResearchAreas researched: Methods:
City of Duluth water system
UMD and SpHC water system
Main water consuming areas in SpHC
Water fixtures and facilities
Costs associated with water consumption
InterviewsToursPhotographyInternet Research
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Minnesota Water UseMinnesota per capita water usage: 68 gallonsNational per capita water usage: 98 gallons
Figure 8: Minnesota Water Use by Category, 2005 (Fairbairn, 2010) NOTE: The light pink portion represents Thermoelectricity.
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Domestic Water SchematicTwo water sources
8” and 10” (two pipes coming from same supply) Not metered individually for SpHC
Back-up not metered by City of Duluth One waste water pipe: 15”
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Water Consumption in SpHCAwareness of possible areas in SpHC that are
or could be major water users (locker rooms, rest rooms, pool, ice rink, etc.)
Water meter data for SpHC (hot, cold, steam)Water flow for each water fixture (shower
heads, faucets, toilets)Are there ways to improve their efficiency?
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Water Consumption in SpHC
Table 1: Water Usage in SpHC. (Sawyer, 2010), (Russel- Ausley, 2002) & (Stevens, 2010).
Amount of water used in primary water-consuming areas of SpHC
Showers 2.0 or 2.5 gpm depending on brand
Faucet 0.5 gpm
Toilets 1.6 gallons per flush
Urinals 1 gallon per flush
Pool 136,000 gallons to fill it, minimal loss and add-in based on chemical mixing, evaporation, and leakage
Cooling Tower See SpHC Cooling Tower Water Use by Month and SpHC Cooling Tower Annual Water Use
Ice rink 200‘ x 100' sheet of 1” thick ice is 20,000 gallons Average of 80-100 gallons for resurfacing
NOTE: Complete data is not available for every area of SpHC that uses water. This table represents data that is currently available.
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Ice Rink and Cooling Tower
Figure 11: SpHC Cooling Tower Annual Water Use (Sawyer, 2010).
Figure 10: SpHC Cooling Tower Water Use by Month (Sawyer, 2010).
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Pool136,000 gallons of water (3 Room 9’s) Drained and refilled usually twice/year
hot and cold waterWater is filtered and returned to the pool
Some domestic water is added in the processSurge Tank
Catches water overflow and drained water for recirculation
Filter TankFilters water from surge tank before it is pumped
back into the pool
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Pool VentilationNew Pool Pack Unit installed March 2010
Pulls air out of the natatoriumDehumidifies and adds 10% fresh air Goal: Regulate temperature and humidity to
control evaporation
W = (69+0.35 v)(pw-pa)/Y
W = evaporation rate, lb/h·ft2 (pounds per hour per square foot)v = air velocity at water surface, ft/minpw = saturation vapor pressure at water temp, in Hg (inches of Mercury)pa = saturation vapor pressure at air dew point, in Hg, also partial pressure of water in pool atmosphereY = latent heat at pool temperature, Btu/lb (British thermal unit per pound)
Figure 12: Rates of Evaporation from Swimming Pools in Active Use
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ImpactsEnvironmental
Effect caused by human activity or natural phenomenon on an environment that is related to or dependent upon water.
EconomicAny increase or decrease in the productive potential of the
economy.
SocialThe consequences to human population of any public or
private actions related to water that alter the ways in which people live, work, play, relate to one another, organize to meet their needs and generally cope as members of society.
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Environmental ImpactsWildlife and plant speciesDecrease in water quality
Increase in temperatureChange in Oxygen levelsIncrease in concentration of pollutantsDisturbance of contaminated sediments
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Economic ImpactsFinancial expenditures vs. savings
Water costs start at $2.56/100ft³ up to 4,000ft³UMD utility bill: Water = 6% of total cost
$288,000-$390,000 annually
Figure 14: 2009 UMD Utility Bill Percentages (Sawyer, 2010)
Community/Global Domino Effect:Shipping Industry1” water level drop
= 250 tons of coal left on dock when a thousand-footer weighs anchor
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Social ImpactsU.S. is using water more efficiently, but
population growth is negating those gains in efficiency
Abundance of fresh lake water in DuluthLeads to less awareness of responsible water
consumptionUMD’s reputation as an environmentally
conscious campus
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RecommendationsEnvironmental EconomicSocialOther
NOTE: The research team does not propose that areas of SpHC stop using water. Instead, the research team aims to make recommendations for responsibly using water while ensuring these areas continue to serve their purposes.
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Environmental RecommendationsUse as little as possibleReturn water that can be reusedMaintain water quality
Use fewer chemicalsUse environmentally-friendly chemicals
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Economic RecommendationsInstall water on domestic cold water pipe
6” pipe with an average cost of ~$5,000Would complement current meter on domestic
hot waterInstall low-flow water fixtures in any remaining
areas of SpHC
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Social RecommendationsRaise awareness of responsible water
consumption“Just One Minute” campaign
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Other RecommendationsPool
Install a 3” water meter to measure domestic water use in only the pool area
Enlarge the surge tank Would decrease amount
of new domestic water added
Ice rinkImprove water
quality used for surfacing the ice rink Leads to a better
sheet of ice and less required resurfacing
http://www.d.umn.edu/recreation/%28RSOP%20Web%29/Facilities/index.html#ice
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Future ResearchWater Boilers
Assess energy efficiencyPotential correlation to water consumption
Water FixturesCollect number of each type of fixture to assess
and compare overall efficiency
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ConclusionWater-consuming areas of SpHC need to continue
functioningRevenue
Unknown total domestic water consumptionSome calculations madeMeters are needed
Water use can be reduced in certain areasSurge tank for poolLocker rooms -- low flow fixtures
Raise awareness
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Thank You!