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Superviser: A/Prof. Bas Heijman Promotor: Prof. Luuk Rietveld

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.

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Superviser: A/Prof. Bas Heijman Promotor: Prof. Luuk Rietveld

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  1. Application of Tight Ceramic Ultrafiltration (TCUF) and Ceramic Nanofiltration (CNF) for water reuse Ran Shang Superviser: A/Prof. Bas Heijman Promotor: Prof. Luuk Rietveld

  2. Ceramic membranes

  3. Ceramic membranes Defect in a ceramic membrane - Homogeneously distributed membrane pores - Long service life - High chemical and thermo- stability Excellence - High cost (5~10 times) - Fragile Drawback

  4. Tight Ceramic UF (CTUF) & Ceramic NF (CNF) Relative size of common materials Polymeric membranes Ceramic membranes

  5. Multivalent anion rejection using negatively charged CTUF or CNF Electrostatic repulsion Double layer overlap Cations >> anions A membrane pore with negative surface charge • 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)

  6. Secondary effluent water filtration using 3kDa TCUF • Take-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.

  7. Implication(1) for effluent water reuse • Poor removal of OC, P Biofouling in RO Municipal wastewater Demiwater for reuse PS AS SS MMF UF RO Demiwater for reuse Coag. TCUF/CNF RO Digester >95% P removal ~40% OC removal P limitation!! Low organic carbon!! ~60% P removal ~50% OC removal ~0,3 µg P L-1 ~3 mg L-1 TOC Biofouling

  8. Implication(2) for sewer mining Municipal wastewater Demiwater for reuse PS AS SS MMF UF RO Energy Energy Digester Municipal wastewater Biofouling??? Demiwater for reuse PS CNF RO Efficiency in concentrating OC and P ??? Anaerobic RO Digester P limitation Energy Struvite

  9. Thank you for your attention!

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