Desalination and Long-Haul Transfer as a Drinking Water Supply Ashlynn Stillwell December 4, 2008 CE394K: GIS for Water Resources

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Presentation transcript:

Desalination and Long-Haul Transfer as a Drinking Water Supply Ashlynn Stillwell December 4, 2008 CE394K: GIS for Water Resources

Ashlynn Stillwell CE394K Presentation 2 December 4, 2008 Outline Background on Desalination Purpose of Project Assumptions Case Study Map Results and Discussion Implications Questions

Ashlynn Stillwell CE394K Presentation 3 December 4, 2008 Background on Desalination Treats brackish water or seawater to potable quality Types of desalination –Multi-effect distillation –Multi-stage flash –Reverse osmosis Source: Lawler & Benjamin

Ashlynn Stillwell CE394K Presentation 4 December 4, 2008 Purpose of Project Dallas-Fort Worth Metroplex is growing –Metro statistical area: 5.6 million people (2003) –Dallas water use: 238 gal/person/day –Fort Worth water use: 177 gal/person/day Population increases 2% annually, on average Depleted water supplies Looking toward alternative supplies

Ashlynn Stillwell CE394K Presentation 5 December 4, 2008 Assumptions 20 MGD desalination facility –Sufficient for 100,000 people at current DFW water use –Real estate available No financial consideration – energy only Pipe friction factors based on laminar flow

Ashlynn Stillwell CE394K Presentation 6 December 4, 2008 Desalination and Long-Haul Transfer Map Straight Pipeline from Houston to Dallas-Fort Worth

Ashlynn Stillwell CE394K Presentation 7 December 4, 2008 DEM and Cumulative Elevation Changes Cumulative elevation change: 700 m (2,300 ft) Pipeline length: 413 km (257 mi) Straight Pipeline from Houston to Dallas-Fort Worth

Ashlynn Stillwell CE394K Presentation 8 December 4, 2008 Desalination and Long-Haul Transfer Map Right-of-Way Pipeline from Houston to Dallas-Fort Worth

Ashlynn Stillwell CE394K Presentation 9 December 4, 2008 DEM and Cumulative Elevation Changes Cumulative elevation change: 745 m (2,400 ft) Pipeline length: 486 km (302 mi) Right-of-Way Pipeline from Houston to Dallas-Fort Worth

Ashlynn Stillwell CE394K Presentation 10 December 4, 2008 Energy Requirements for Desalination and Long-Haul Transfer Total: 407,000 kWh/dayTotal: 28,500 kWh/day

Ashlynn Stillwell CE394K Presentation 11 December 4, 2008 Air Emissions from Energy Production Electricity generated by coal: 933,000 lbs CO 2 2,700 lbs SO 2 2,000 lbs NO x Electricity generated by natural gas: 466,000 lbs CO lbs SO 2 12 lbs NO x 407,000 kWh/day

Ashlynn Stillwell CE394K Presentation 12 December 4, 2008 Implications for Energy and Water Policy Desalination scenario requires 14 times more energy than standard water treatment Additional environmental concerns over disposal of concentrate “Alternative” water supply – Conservation –Water Conservation Implementation Task Force recommends 140 gal/person/day –Saving water saves energy

Ashlynn Stillwell CE394K Presentation 13 December 4, 2008 QUESTIONS?

Ashlynn Stillwell CE394K Presentation 14 December 4, 2008 END Ashlynn Stillwell Graduate Research Assistant Cockrell School of Engineering Department of Environmental & Water Resources Engineering Lyndon B. Johnson School of Public Affairs University of Texas at Austin

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