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F. Bloetscher, Ph.D., P.E. and L. Simons, Florida Atlantic University … · 2012-06-06 · Water...
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F. Bloetscher, Ph.D., P.E. and L. Simons, Florida Atlantic University
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Population Centers
Source: Nasa.gov
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Water Demand 2005/2030
The Shift in Demand is West and South
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Consumptive Losses
The Critical areas are West and South
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Over stressed Aquifers
The Critical Areas are Great Plains Breadbasket and South
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Future Shortages
Generally Areas where Growth is Expected
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Options For NewWater Supplies Conjuctive use Regenerated water supplies
Reclaimed water Multiple pass cooling Concentrate reuse
Alternative Supplies Desalination IPR
Purchase water rights
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Increasing Levels of Treatment increases Power Consumption in developed areas.
Water Treatment Processed Power
(MW)/MGDAeration/HSP/wells 1.4Lime Softening 2.3Nanofiltration 125 psi 2.7LPRO >200psi FL RWS 3.3Secondary Pure OX 3.4Reuse 3.0Seawater desal 13.0
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Projected Future Power Generation
So Where is the Power for Water Treatment Coming From?
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Hydroelectric
Source: Water Energy Resources of the United States with Emphasis on Low Head/Low Power Resources (p. 47), U.S. Department of Energy
Most of the west has critical shortages as does the south
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Thermoelectric Water Use
Coincides with Many Critical Water Supply Areas
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Coal Fired Plantsin US
Located in Many Current Critical Areas
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http://www.powermag.com/issues/cover_stories/Map-of-natural-gas-power-plants-in-the-United-States-by-nameplate-capacity-and-total-production-costs_1360.html
Natural Gas Power
Located in Some CriticalWater Supply Areas
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Nuclear Plants
Located in Many Current Critical Water Supply Areas
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Water Demands for PowerPower PlantTechnology
Cooling Demand G/MWhr
Other Use or Consumption
Coal Fired 50,000 500Coal - IGCC 200 300
Natural Gas - Open Loop 20,000 1000Nuclear - Open Loop 60,000 minimalNuclear - Closed Loop 1000 100Geothermal 20,000 20,000Wind 750 750Solar PV 0 minimal
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Water Use by Power Type
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Water/power Conflict Areas
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Solutions?
Biofuels? Wind? Solar? Biomass? Others?
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BiofuelProduction?
Growth Proposed in Current Critical Areas with Creates a Direct Conflict
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Fuel Development Needs
Fuel/Process Water Need
Water Use (MGD)
water/MWh
Gallons of Water/gallon
of fuelOil/Gas Refining refining 20 to 70 1.5Oil/Gas Extraction extraction 6 to 10 1.5Oil/Shale refining 3 to 30 2Oil sands extraction 50 to 150 3Biofuels - Ethanol Growing fuel stock 10,000 - 100,000 1000Biodiesel Process Growing fuel stock 15 to 20 1
Biofuel - Soy Growing fuel stock50,000 to 200,000 6500
Biomass conversion Growing fuel stock 50 to 350 4
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Wind Power
Located in Great Plains/RM Critical Areas
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Solar Options
Located in South and West Critical Areas
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Biomass –A Better Option?
Located in Many Developed or Critical Areas
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Landfill Biomass
Located in Many Developed Areas
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BioMass –Methane WWTP
Located in Many Developed Areas
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Often among the largest user on power grid Must provide service 24/7 Power demands cannot be shifted Back-up usually provided – leads to load
agreements
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Energy Costs for Water and Wastewater Treatment Plants are
Significant
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Power Use
Digester
Capital Saving
Regional Solution
Reduced Grid Power
Demand
Energy Capture
Ag solution
Customer KWhr Power
Savings
Increased Yield
New Jobs Energy Subsidies
Sludge New Jobs
New Jobs
Methane at WWTPs..
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Clarifier Sludge
Return to Aeration Basin
Gravity Thickener
Digester
Methanescrubber
Belt Press
Ag Use Treatment
For a 100 MGD plant, incoming solidsAre equal to 80 tons/dSludge from Clarifier is 1% solidsGravity Thickener sludge is 2-4% solidsDigester convert half solids to methaneand rest is 4% solidsBelt press converts to 20-24% solidsBelt press will be 45 tons/d solids
Mini-turbines
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Identification of Energy Conservation Improvements (ECIS- WWTPs)
Equipment - Fine Bubble Diffusers Equipment – Turbo Blowers Equipment - Automatic DO Control (2 mg/L) Operation – Auto. DO Setpoint Control (0.5
mg/L) Operation – Most Open Valve Blower Control
vs. Pressure Setpoint
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0
10000
20000
30000
40000
50000
60000
70000
City of Boca Raton WWTP
South Central Regional WWTP
Seacoast Utilities PGAWWTP
East Central Regional WWTP
Palm Bch Co Southern Regional
WWTP
kwh
per y
ear p
er M
GD
sav
ed
MOV Control vs. Pressure Setpoint
Automatic DO Setpoint Control (0.5 mg/L)
Automatic DO Control (2 mg/L)
Upgrade to Turbo Blowers
Fine Bubble Diffusers
Projected Savings ECIs @ 5 WWTPs)
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Proposed Water Treatment Cost for SE Fl -> For 600 MGD of Wastewater RO’ed = $6 B
capital Power Cost @ 3 MW/MGD = 1.8 GW power
supply needed For 250 MGD of saltwater sources RO’ed =
$4.5 B Power cost @ 5 MW/MGD = 1.25 GW needed
Wind option is limited, PV panels are billions.. WWTPs could produce 25% of this power
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Conclusions Water and Wastewater Treatment Plants
are major Power Users New Water Sources = more treatment Increased levels of Treatment increase
local power demands considerably Growth in power demands are unlikely to
be satisfied by the current power plants Insufficient water supplies are available in
most growth areas
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Conclusions Power grid is unlikely to provide enough
transmission capacity to satisfy increased local power demands due to increased treatment
New power plants will be required in places with limited traditional power capacity for treatment in areas with currently overstressed limited water in south and west
Biofuel development conflicts with water supplies
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However… Untapped wastewater potential exists
from easy solutions Untapped methane form landfill and
WWTP biomass is available near developed areas
Untapped Solar and Wind are available in most potential growth areas that have over-stressed water supplies
Wind/solar and water treatment are not incompatible
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Going Forward…. WWTPs offer significant opportunities to
reduce power off the grid, but the incentives to invest in technology are lacking as is capital
Water Plants have much fewer opportunities Site Specific for PV, Wind Incentives needed for green power (wind,
PV) – federal exist, but not power industry Multiple uses should be encouraged
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Questions?
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Example of a Potential Problem
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39
Historical SE Florida Water System
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Modern System The surface water flows
in many directions but primarily east/west
Faster runoff = less percolation
Faster runoff = less ET
40
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Meanwhile Demands Increase
0.00
5.00
10.00
15.00
20.00
25.00
30.00
1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 2030
Year
Po
pu
lati
on
(m
illi
on
s)
FloridaSouth Florida
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Floridan Ocean
concentrate
permeate
Rawwater
Floridan Aquifer Desalination is the Answer?
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44
Lake Okeechobee
Atlantic Ocean
-20
Biscayne Aquifer
Regional Solution?
Recharge the Everglades w/ RO treated water to Recharge the Biscayne Aquifer
Flow
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Regional Wastewater Disposal Participation
• Reverse Osmosis• Ultraviolet
• Advanced Oxidation• HUGE CARBON • FOOTPRINT
$$$$$$$$$$$$$$$$$