Effect of water chemistry on structure and performance.pptx

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1. Effect of water chemistry on structure and performance of polyamide composite membran

2. Introduction Membrane is a thin film or sheet of material which functions as a selective separator Membrane have 2 character, selectively permeable and semipermeabel

3. Reverse Osmosis (RO) and Nano Filtration (NF) Membrane Reverse osmosis (RO) and Nanofiltration (NF) are physical separation technologies used to remove contaminants from liquid streams . The excellent separation performance and broad applicability of NF and RO membranes have led to widespread employment in drinking water production, wastewater treatment and industrial separations

4. How RO and NF are similar? Both RO and NF benefit from pretreatment Both RO and NF require pressure to function Both are used in place of conventional treatment technologies

5. RO VS NF Reverse Osmosis (RO) RO is the finest of all membrane filtration systems, with extremely small pores  capable of removing particles as small as 0.1 nm applications of RO include filtering process water for industrial applications, such as in the printing industry, in order to sustain optimal equipment performance.  RO membranes are very efficient at removing all ions, large and small. Nano Filtration (NF) NF delivers slightly coarser filtration than RO,  with the ability to remove particles as small as 0.002 to 0.005 μm in diameter NF removes harmful contaminates, such as pesticide compounds and organic macromolecules,  while retaining minerals that RO would otherwise remove Nanofiltration membranes are capable of removing larger divalent ions such as calcium sulfate, while allowing smaller monovalent ions such as sodium chloride to pass through

6. R esearch P urposes Expand upon the extended solution-diffusion model of Verliefde et al to more accurately calculate changes in membrane structure and solute-solvent-membrane interaction under water chemistry Provides new structure performance insight into polyamide NF/RO membrane seperation performance

7. Polyamide Composite Membrane Composite membrane is asymmetry membrane consists pore layer and dense active layer from different materials Polyamide is a polymer which consists of amide monomers linked by peptide bonds

8. METHODOLOGI Membrane and Chemicals Representative polyamide NF and RO membranes (NF90, NF270, BW-XLE) were received as flat sheet and stored in laboratory deionized water at 4°C. Chemical agents used to adjust feed water chemistry were all analytical grade (Fisher Scientific, Pittsburgh, Pennsylvnia ). Ethylene glycol was used as a model neutral solute in performance test

9. Effect of water chemistry on membrane performance (Feed ionic strength)

10. Feed pH

11. Presence of divalent cations in feed

12. Effects of water chemistry on solute–water–membrane interaction energy

13. Effect of water chemistry on membrane structure

14. Conclusion Experimental data and model fits illustrating the effects of ionic strength and water flux on EG rejection for (a) NF90, (b) XLE and (c) NF270 membranes will be present

15. Experimental data and model fits illustrating the effects of pH and water flux on EG rejection for (a) NF90, (b) XLE and (c) NF270 membranes.

16. Experimental data and model fits illustrating the effects of divalent cations and water flux on EG rejection for (a) NF90, (b) XLE and (c) NF270 membranes.