Advanced Membrane Technologies Stanford...
Transcript of Advanced Membrane Technologies Stanford...
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Advanced Membrane TechnologiesStanford University, May 07, 2008Advanced Membrane TechnologiesAdvanced Membrane TechnologiesStanford University, May 07, 2008Stanford University, May 07, 2008
Membrane SeparationMembrane Separation……BasicsBasics
Harry F. Ridgway, PhDHarry F. Ridgway, PhD
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Global Water Supplies…> 2 billion lack reliable access to clean water
PollutionDrought GW Depletion
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17th Century AD ~ first recordedJapanese sailors ~ distillation earthen pots/bamboo reeds
1790’sThomas Jefferson & Jacob Isaacks
US Navy – Distillation: “Report on Desalination of Seawater”
1881First commercial desal plant
Tigne, Sliema, Malta
1907Ottoman Turks – Jeddah Distillation Plant
Replaced in 1928
3rd Century BCAristotle describes water cycle & distillation process
2nd Century BCEgyptian distillation processes described
History of Desalination…5th Century BC ~ wool condensatorEarliest distillation process by Greek sailors
AD
BC
400 BC
1900
1700
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By mid 1900’s…Advances in microscopy and cell biology led to concept of the Lipid BilayerMembranes and semipermeable membranes…
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By the 1950s R&D was underway to ID a synthetic permselective membrane…
1960, S. Yuster ~ UCLA, Sid Loeb & Souri Sourirajan
“First” Spiral-Wound Element ~ 1963
General Atomic – Fluid Systems
…early 1960’s…
Commercialization…
…permselectivity
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Desal by CA films(Breton & Reid - 1959)
Asymmetric CA developed(Loeb & Sourirajan - 1962)
First spiral-wound module(General Atomics - 1963)
First hollow-fiber module(Du Pont - 1967)
Interfacial composite developed(Cadotte - 1972)
NF widely available(Fluid Systems, Nitto Denko, FilmTec - 1986)
First commercial TFC(Riley @ Fluid Systems; Jiddah SW
plant installed - 1975)
First fully aromatic TFC(FT30 membrane; Cadotte - 1978)
Water Factory 21 built(OCWD - 1975)
First large solvent RO sep.(methyl ethyl ketone from lube oil; Grace-Davison
& Mobil Oil,Beaumont, TX - 1998)
1960 20001970 1980 1990 2010
New membrane &process development
Milestones in Membrane
DevelopmentAdapted from R.W. Baker ~ 2004 ~ Membrane Technology and Applications
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“Loeb-Sourirajan” membrane…(asymmetric cellulose acetate membrane ~ phase inversion process)
Pressure Range: >150 psiFlux Range: 5-20 gfdpH Range: 4 – 6.5Solute Rejection: 75-95%Free Chlorine: < 3 ppm
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Membrane Synthesis…Phase Inversion/SeparationMembrane SynthesisMembrane Synthesis……Phase Inversion/SeparationPhase Inversion/Separation
Gel Tank Rinse Tank
Solution Trough(e.g., CA in acetone, ethyl acetate, heptane, dimethyl formamide) Fabric Feed
Take-Up Roll
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Current “State-of-the-Art” TFC Membranes…(X-Linked Polyamide, John Cadotte, 1975; interfacial polycondensation reaction)
CO
NH
CONH CONH
CO
CO NH
NH
COO-
NH
X Y
aromatic cross-linked polyamide
Pressure Range: 100-150 psiFlux Range: 10-40 gfdpH Range: 2 - 11Solute Rejection: 97 - 99%Free Chlorine: <0.1 ppm
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TMCOrganic Phase – e.g., heptane
H:Cl
Interface
MPD
X-linking orchain extension
X-linking orchain extension
Aqueous Phase
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Nano-pore formation resulting from X-linking…
T M TM T
MT M
T
M
T M T M T
M T T MM
M
COO-
COO-
COO-
COO-
“Pore”
“Nano-Pores”…
•Shape•Distribution•Reactivity•Dynamics
Randomly-folded self-avoiding chain
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Probe surface rendering of hydrated FT30 Membrane
(probe radius = 1.4 Angstroms)
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Oven Drying
Coating
RinseAcid Chloride(organic phase)
Membrane Synthesis…Interfacial PolymerizationMembrane Synthesis…Interfacial Polymerization
Support (e.g., PS)(feed roll)
AqueousAmine
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Membrane“black box”
Feed Side(concentrate)
PermeateSide
Membrane Theory…
x SolubilityResistance
x ForceDiffusivityFlux =
“Solution~Diffusion Theory”•Lonsdale et al., J. Appl. Poly. Sci., 9, 1341-1362 (1965)•Kimura & Sourirajan, AIChE J., 13, 497-503 (1967)
Water/Solute passage
Rejection
Solute
Water
PressurePressure
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Membrane Categories…
Solution/Diffusion Pore Exclusion
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Pressure Driven:RO, NF, UF, MF, MBR, Gas…
Charge Driven:Electrodialysis…
Thermal Driven:Membrane Distillation…
Osmotic Driven:Forward Osmosis…
Membrane Separations…
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Spiral-Wound Modules(brackish, UPW, wastewater, seawater) Hollow-Fiber Modules
(RO, gas separations)
Module Configurations…
Plate & Frame Modules(filter presses, laboratory, MBRs)
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Membranes are scalable…
LARNACA SWRO WATER DESALINATION PLANT, CYPRUS (54,000 m3/day)
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Source RO SystemUF/MBR System
UV Disinfection
Product
Advanced Treatment Systems…
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Novel Membrane Development…
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Zeolites…Crystalline or semi-crystalline porous metallo-oxides…
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Hybrid Zeolite-Polyamide Nano-Composite(Byeong-Heon Jeong & Eric Hoek, UCLA &, Yushan Yan, UCR)
http://www.cee.ucla.edu/faculty/ehoek.htm
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Supported Zeolite RO/NF Memb…Richard Noble Group…University of Colorado, Boulder
Zeolite RO/Nano-MembranesJunhang Dong Group, New Mexico Tech…Socorro [email protected]
Ceramem Corporation…http://www.ceramem.com/index.htm
Other Zeolite Membrane Groups…
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γ-Alumina (Ceramic) Membranes…Yu, Matthew Mottern, and Henk Verweij , OSU; John Bukowski, and Jennifer Lewis
Quasi-homogeneous α-Al2O3 supports
TEM γ-alumina membrane(Made by dipping supports in nano-particle precursor
dispersions, followed by calcination.)
www.mse.eng.ohio-state.edu/fac_staff/faculty/verweij/http://colloids.mse.uiuc.edu
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Synthetic Coating Technologies...Ingo Pinnau & R. Baker, MTR, Inc., Menlo ParkLouie et al. 2006. J. Memb. Sci., 280, 762-770
+Coating
Biocide
EnzymesSensors
Smooth Anti-fouling Coating(polyether-polyamide copolymer (PEBAX 1657))
PS Layer
Support
PA Layer
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Carbon Nanotube Membranes: Many groups…Carbon Nanotube Membranes: Many groups…
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Nano-Technology Era(materials engineering, nanofluidics, bio-hybrids)
Organic-Polymer Era(phase inversion & interfacial sciences)
~1960 ~1975 ~2000 ~2005 ~2010 ~2015
Membrane SeparationsMembrane Separations
The Age ofThe Age of
CA(Loeb-Sourirajan)
CA(Loeb-Sourirajan)
PA/TFC(J. Cadotte - IP)
Next Gen TFC Membranes-surface modifications (grafts, coatings)
Hybrid & Ceramics/Nanotubes-development of new supports
Biomimetic Ion Channels-amphipathic macrocycles
?
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MembraneFouling…
MembraneIntegrity…
ModuleDesign…
Trace OrganicsRejection…
Technical & Scientific Challenges…
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Membrane Fouling…
Mechanisms…•Kinetics•Adsorption•Precipitation
Control…Pretreatment(filtration, biocides, dispersants)
Membrane/module(surface mod., spacer/channel design)
Foulant layer(EPS, porosity, integrity)
Operation(cleaning, recovery)
Categories…•Biofouling•NOM fouling•Mineral scaling•Particulate fouling
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Biofilm Morphology…
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…x-flow (~90%)
Flux (~10%)
Fouling Mechanisms...
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Time0 1 week 1 month
Biofilm Coverage
System Performance
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ACS
Adsorption interactions
Fouling Mechanisms...
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1960’s 1970’s 1980’s 1990’s Now…
Regulatory Emphasis
SaltsSalts TOCTOC(total organic carbon)(total organic carbon)
Organics Rejection…
•RO membranes originally designed to reject salts, notnot organicsorganics!!
SpecificSpecific OrganicsOrganics
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Molecular mass is not the whole story!
Figure 1 from conditionally accepted PFC paper: Steinle-Darling & Reinhard, Stanford U.
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Compound Rejection Mechanisms…
Repulsion(too large?; too hydrophilic?)
Membrane Interior
Feed
Permeate
Transport toMembrane surface…
Moderate interaction(dissolution in membrane; diffusion)
Permeation & desorption
Strong interaction(surface accumulation)
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System Properties(statistical mechanical properties)
Interactions
Modeling Information...
Trajectories(coordinates, energies & velocities)
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End…
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PEBAX Coating…