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Application of Tight Ceramic Ultrafiltration (TCUF) and Ceramic Nanofiltration (CNF) for water reuse. Ran Shang . Superviser: A/Prof. Bas Heijman Promotor: Prof. Luuk Rietveld. Ceramic membranes. Ceramic membranes. Defect in a ceramic membrane. - PowerPoint PPT Presentation
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10-01-2014 Challenge the future
DelftUniversity ofTechnology
Superviser: A/Prof. Bas Heijman
Promotor: Prof. Luuk Rietveld
Ran Shang
Application of Tight Ceramic Ultrafiltration (TCUF) and Ceramic Nanofiltration (CNF)
for water reuse
2
Ceramic membranes
3
Ceramic membranes
- Homogeneously distributed membrane pores- Long service life- High chemical and thermo- stability Excellence
- High cost (5~10 times) - Fragile Drawback
Defect in a ceramic membrane
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Tight Ceramic UF (CTUF) & Ceramic NF (CNF)
Polymeric membranesCeramic membranes
Relative size of common materials
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Multivalent anion rejection using negatively charged CTUF or CNF
A membrane pore with negative surface
charge
Electrostatic repulsionDouble layer
overlap
Cations >> anions
Take-home message:• 40%~87% of Ortho-P rejection by a 3 kDa TCUF, dependent on
operational conditions (flux, cross-flow velocity, pH).• Higher solution pH leads to higher rejection, due to enhanced
negative surface charge.(Shang et al. Wat. Res. V. 48 P. 498-507)
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Secondary effluent water filtration using 3kDa TCUF
Rejections, %
Organic matter 45±3 in DOC 61±2 in UV254
Phosphate 62±7
Sulphate 16±1Nitrate 1.0±0.5
Conductivity 4.1±0.1Take-home message:• Phosphate has negative charge and low diffusion: thus easy
removal.• Membrane fouling by effluent organic matter can enhance
phosphate rejection.• About 50% or higher organic removal.
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Implication(1) for effluent water reuse
PS
Municipal wastewater
AS SS
MMF UF RO Demiwaterfor reuse
Digester
Biofouling in RO
Coag. TCUF/CNF
RO Demiwaterfor reuse
>95% P removal~40% OC removal ~60% P removal
~50% OC removal~0,3 µg P L-1
~3 mg L-1 TOC
P limitation!!Low organic carbon!!
Poor removal of OC, P
Biofouling
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Implication(2) for sewer mining
PS
Municipal wastewater
AS SS
MMF UF RO Demiwaterfor reuse
Digester
CNF RO Demiwaterfor reuse
Digester
Energy
Energy
Energy
Struvite
P limitationAnaerobic RO
Biofouling???
Municipal wastewater
PS
Efficiency in concentrating OC and P ???
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Thank you for your attention!