DESALINATION TECHNOLOGY
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Transcript of DESALINATION TECHNOLOGY
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DESALINATION TECHNOLOGY• THERMAL• MEMBRANE• SOLAR• TECHNICAL• ECONOMICS• ENVIRONMENTAL• POLITICAL
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• Membrane separation processes (UF and RO)– Superior treatment– Relatively modest capital and operating costs
• Major obstacles– Permeate flux decline
• Concentration polarization• Fouling
– Temperature effects not well understood
PERFORMANCE OF SPIRAL WOUND MEMBRANES
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permeate
cp
Jv
membrane
boundary layer
soluteJs
cb
feed flow
convective flow
back diffusion
soluteirreversible bound layer
reversible gel layer
cw
{
Figure 1
Concentration Polarization
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Figure 2
i = ni = n-1
i = 2
Jo(t)-decrease in pure water
i = 1
permeability due to fouling
Ja1
Ja2
J(tp)- flux decline due to concentration polarization
tptcpermeation cleaning
membrane life-time -tt
Jo
J
Time
Solv
ent f
lux
acro
ss m
embr
ane
Flux Decline Due to Fouling
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HUMIDIFICATION/ DEHUMIDIFICATION
PROCESSES
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SEAWATER GREENHOUSE
• FRESH WATER FROM SEA AND BRACKISH WATER
• CROP PRODUCTION• COOL HOUSE• ENVIRONMENTALLY FRIENDLY
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Research Approach
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AREAS FOR COLLABORATION
• Student Training• Demonstration Seawater Greenhouse• Seawater Greenhouse Condenser• USDA/USDI• RO membrane fouling• Applied/Fundamental/Social/
Environmental