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2.500

Desalination and Water Purification

3-0-9 units · Graduate

Introduces the fundamental science and technology of desalinating water to overcome water scarcity and ensure sustainable water supplies. Covers basic water chemistry, flash evaporation, reverse osmosis and membrane engineering, electrodialysis, nanofiltration, solar desalination, energy efficiency of desalination systems, fouling and scaling, environmental impacts, and economics of desalination systems. Open to upper-class undergraduates.

Spring 2009

Topics

  • Introduction to water supply
  • Characteristics of seawater. Concentration and molality
  • Gibbs energy. Work of separation
  • Chemical activity. Work of separation
  • Separation at finite recovery. Osmosis
  • Reverse osmosis. Solution-diffusion model
  • Solution-diffusion model. Crossflow separators
  • Concentration polarization. RO System engineering
  • Introduce term project. Electrodialysis
  • Visit to Koch Membrane Systems
  • Visit GE Ionics
  • Electrodialysis
  • Electrodialysis (cont.). Ion exchange
  • Introduction to thermal desalination
  • Scale formation. Distillation. Least heat of distillation
  • GOR. Combined power generation and distillation
  • Single effect distillation. Multi-effect distillation
  • Single-stage flash distillation. Multi-stage flash evaporation
  • Vapor compression distillation. Relative desalination costs. Freeze distillation
  • Discussion of term project. Details about Haiti
  • Wastewater treatment in the developing world
  • Solar energy. Solar collectors. Solar stills
  • Solar desalination systems; CSP water/power cogeneration
  • Particulate removal. Flocculation. Summary
  • Final project presentations

Readings

Prerequisites & course information

Prereq: 1.020 , 2.006 , 10.302 , (2.051 and 2.06), or permission of instructor G (Spring) Not offered regularly; consult department 3-0-9 units

Sources