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NORIT XIGATM
Dead-end Ultrafiltrationin water treatment
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1. Introduction2. Norit XIGA™ dead-end Ultrafiltration3. UF Process Modes4. Main UF parameters5. Large scale water treatment: examples6. Summary
ContentsContents
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1. Introduction1. Introduction
Gradual decrease of global water sources Boost in the development new technology Water from non-conventional sources:
– WWTP effluent– Sea water
Application of membrane technology:– reverse osmosis (1960’s)– micro-, ultra- and nanofiltration (1980/90’s)
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1. Introduction1. Introduction
MicroFiltration10 um – 100 nm
UltraFiltration100 - 10 nm
NanoFiltration10 - 1 nm
ReverseOsmosis< 1 nm
colloids virusescolourhardness pesticides saltswater
giardacryptobacteria
colour hardnesspesticidessaltswater
colloidsviruses
saltswater
colourhardnesspesticides salts
water
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Dead-end filtration:advantages:
– simple process set-up– low energy consumption– low investment
disadvantages:– laminar flow– discontinuous concentrate discharge– risk of pore and membrane channel plugging– sensitivity to changes in the feed properties
2. Norit XIGA™ dead-end 2. Norit XIGA™ dead-end UltrafiltrationUltrafiltration
feed water
permeate
cake
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2. Norit XIGA™ dead-end 2. Norit XIGA™ dead-end UltrafiltrationUltrafiltration
Cross-flow Filtration:advantages:
– turbulent flow– continuous concentrate discharge– control of cake-layer build-up
disadvantages:– more complex process layout– high(er) energy consumption– high(er) investment cost
feed water
permeate
cake
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>Log 4 removal of viruses
Complete removal of suspended solids
Removal of micro-organisms:>Log 6 removal of bacteria
Partial removal dissolved matter (TOC, COD, BOD)through binding to suspended matter
2. Norit XIGA™ dead-end 2. Norit XIGA™ dead-end UltrafiltrationUltrafiltration
Cryptosporidium(2-3 µm)
Main skills UF:
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8 inch X-FlowUF membrane
module (40 m2)
0.8 mm fibrespore size 20-25 nm
2. Norit XIGA™ dead-end 2. Norit XIGA™ dead-end UltrafiltrationUltrafiltration
Bypass tubes
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2. Norit XIGA™ dead-end 2. Norit XIGA™ dead-end UltrafiltrationUltrafiltration
Membrane housing
Feed
Permeate
Membrane Module
Feed
Permeate
Bypass tubes
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2. Norit XIGA™ dead-end 2. Norit XIGA™ dead-end UltrafiltrationUltrafiltration
Module 1 Module 2Inter-connector
Bypass tubes
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2. Norit XIGA™ dead-end 2. Norit XIGA™ dead-end UltrafiltrationUltrafiltrationMain skills Norit XIGA™-concept:
Dead-end low energy consumption, simple design Horizontal small footprint, easy module handling 8 inch world standard for RO Bypass tubes improved fouling distribution between modules, reduced fouling tendency Fully automated In-situ cleaning of membranes operation
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Filtration3. UF process modes3. UF process modes
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Filtration: inside outsidemembran
e
feed
permeate
3. UF process modes3. UF process modes
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Cake build-up
Pore blocking
BackWash
3. UF process modes3. UF process modes
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Backwash: outside inside
concentrate
backwash
membrane
3. UF process modes3. UF process modes
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Backwash3. UF process modes3. UF process modes
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Adsorption
Chemically Enhanced Backwash
3. UF process modes3. UF process modes
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Chemically Enhanced Backwash
3. UF process modes3. UF process modes
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-250
-200
-150
-100
-50
0
50
100
time
flux
Filtration Filtration Filtration Filtration
BW BW CEB
3. UF process modes3. UF process modes
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Single stage UF
100% 80-95%
5-20%
Feed
Concentrate
Permeate
Typical: Recovery 80-95%
3. UF process modes3. UF process modes
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Dual stage UF
100%Feed
1° Conc.1° Permeate95-99,5%
2° Conc.0,5 - 5%
UF1
UF2
2° Permeate
Typical: Recovery 95–99,5%
3. UF process modes3. UF process modes
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Flux: Yield per square meter membrane surface Ltr/m2.h or lmh
4. UF main parameters4. UF main parameters
TMP: Trans Membrane PressurePfeed – Pperm (bar)
Pf PpFeed
Permeate
Typical (filtration): 60 – 130 lmhTypical (backwash): 250 lmh
Typical (filtration): 0,2 – 0,8 barTypical (backwash): 1,0 – 2,0 bar
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• Pressure Correction Factor = TMP (bar)• Temp. Corr. Factor (to ref. temp, mostly 20°C) =
impact water viscosity & “membrane effect” on TMPat different temperatures)
(Ltr/m2.h.bar). or (lmh/bar).
Permeability: Flux corrected for Pres. & Temp. (also normalised flux)
Example: Temperature impact on permeability:
If T=30°C Perm=152 lmh/bar
If T=20°C Perm=200 lmh/barIf T=5°C Perm=318 lmh/bar
Typical: 150 – 350 lmh/bar
4. UF main parameters4. UF main parameters
Flux = 100 lmhTMP = 0,5 bar
Pf Pp
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minFiltration time: Duration of 1 filtration period
%Recovery: Average permeate flow Average feed flow
Backwash time: Duration of 1 backwash sec
CEB interval: Period between 2 CEB’s hrs
Typical: 15 – 60 min
Typical: 30-50 sec
Typical: 6 – 48 hrs
Typical: 80 - 95 %
4. UF main parameters4. UF main parameters
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Permeability decrease through TMP increase
0
50
100
150
200
250
300
350
0 50 100 150 200
Time [minutes]
Perm
eabi
lity
[lmh/
bar]
0
0,5
1
1,5
2
TMP
[bar
]
Permeability TMP
4. UF main parameters4. UF main parameters
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WWTP
Surface water
Borehole/Spring waterSeawaterWWTP effluent
Potable waterproduction
UF RO
5. Large scale water 5. Large scale water treatmenttreatment
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Irrigation water
Process water
Potable water
Flux 70 - 100 lmhRecovery 80 - 90%
5a. Surface water5a. Surface water
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5a. Surface water5a. Surface water
Purit, The NetherlandsProcess Water (120 m3/h)
Klazienaveen, The NetherlandsIrrigation Water (300 m3/h)
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Potable Water
Flux 100 - 130 lmh Recovery 95 - 99%
5b. Borehole/Spring water5b. Borehole/Spring water
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PWN Heemskerk, The Netherlands2900 m3/h
PWN Heemskerk, The Netherlandspilotplant 10 m3/h
5b. Potable water5b. Potable water
Keldgate, United Kingdom3700 m3/h
Clay Lane, United Kingdom (6700 m3/h)
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SWRO pre-treatment for:
Process WaterPotable Water
Flux 80 - 100 lmh Recovery 80 - 90%
5c. Seawater5c. Seawater
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UAE Potable water 450 m3/h
5c. Seawater5c. Seawater
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From WWTP effluent to:Irrigation WaterProcess WaterGrey WaterPotable Water (indirect)
Flux 65 - 90 lmhRecovery 75 - 85%
5d. WWTP Effluent5d. WWTP Effluent
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Windhoek, Namibië Potable water 850 m3/h
Baranco Seco, Canaries Process water 1000 m3/h
5d. WWTP Effluent5d. WWTP Effluent
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Norit Dead-end XIGATM Ultrafiltration:
Large number of applications
Fully automated operation,easy operation
Compact design with small footprint, easy module loading and replacement
6. Summary6. Summary
Superb filtrate quality; complete removal of SS & micro-organismspartial removal of TOC, COD & BOD
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