development of selective membranes composition and configuration for water treatment
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8/13/2019 Development of Selective Membranes Composition and Configuration for Water Treatment
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“ Development of Selective Membranes
Composition and Configuration forWater Treatment”
M.Gamal Khedr
Saudi Industries for Desalination
Membranes and Systems Ltd.
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Crossflow Membrane Processes
Process ComponentsRetained TransmembranePressure Process Applications
RO 99% of most ions,
most organics over 150
MW
200-1000 psig
(13.8-69.0 bar)
Brackish and sea water desalting,
boiler feed purification,
blowdown reclamation,
pretreatment to ion exchange,
ultrapure water production.
NF 95% divalent ions,
40% monovalent ions,
organics greaterthan 150-300 MW
135-230 psig
(9.3-15.9 bar)
Hardness removal, heavy metals
removal, organic and
microbiological removal, dyedesalting, color removal
UF Most organics over 1000
MW
25-100 psig
(1.7-6.9 bar)
Pre- and post-treatment to ion
exchange, beverage clarification,
concentration of industrialorganics and dilute suspended
oils, removal of pyrogens,
bacteria, viruses, and colloids.
MF Small suspended particlesgreater than 0.1 µ 25-50 psig(1.7-3.4 bar) High volume removal of smallsuspended solids.
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Municipal Waste Water Treatment by Membrane Methods
Raw Water Product Water Membrane Function Membrane
Process
Municipal waste
water
– Pure water for irrigation
purposes and some municipal
uses
Removal of suspended
matter, bacteria and
viruses
MF
UF
Removal of organics,
colour and THM
precursors
UF
– Potable water Desalination RO
– High purity water for
industrial processes
Removal of hardness
components
NF
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COMPARISON BETWEEN DIFFERENT TYPES OF RO MEMBRANES
PARAMETER THIN FILMMEMBRANE
CELLULOSEACETATE
MEMBRANE
HOLLOW FIBERMEMBRANE
1. SALT REJECTION 97-99.5%- 94-97% 96-97%
2. NET OPERATING PRESSURE 150-200 PSI 400 PSI 400 PSI
3. ENERGY CONSUMPTION
Kw-hr/1000
gal product
2.12 (SH)
2.55 (SG)
5.1 5.54
4. MAXIMUM FEED
TEMPERATURE
45oC 35oC 35oC
5. OPERATING pH RANGE 4-11 5.5-6.5 4-11
6. CLEANING pH RANGE 2-12 4-8 2-12
7. BIODEGRADABLE NO YES NO
8. PERMITTED SDI IN FEED
WATER
< 5 < 3 < 3
9. MEMBRANE CONFIGURATION SPIRAL WOUND SPIRAL WOUND HOLLOW FIBER
10. ELEMENT DIAMETER 8” ELEMENTS
4” ELEMENTS
8” ELEMENTS
4” ELEMENTS
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4 0 m 3 / h r
March 1993
Time
150
September 1993 November 1994 July 1995 March 1996 November 1996 July 1997
150
May 1994
150
P
e r m e a t i o n r a t e , J v . m 3 / h r
M.G.Khedr / Desalination 153 ( 2002 ) 295-304
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Future Trends in Development ofFuture Trends in Development of
Membrane Separation ProcessesMembrane Separation Processes
Better chemical, mechanical and thermalBetter chemical, mechanical and thermalresistanceresistance
Lower energy consumptionLower energy consumption
Lower water pretreatment needsLower water pretreatment needs
Easier operation and maintenanceEasier operation and maintenance
Resistance to foulingResistance to fouling
Better control of hydrophilic /Better control of hydrophilic /
hydrophobic interactionshydrophobic interactions
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Hydrophilic vs. Hydrophobic
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0.1
0.2
0.3
G F D / p s i
0.4
95
96
97
98
100 200 400300 600500 700
S a l t R e j e c t i o n , (
% )
Hydrophilic UF membrane
Normal UF membrane
0.00
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