Crystallization behavior of salts during membrane distillation with hydrophobic and superhydrophobic capillary membranes

Abstract Superhydrophobic nano-composite polypropylene capillary membranes were fabricated for membrane distillation and crystallization by coating the surface with TiO2 and fluoro-silane compounds. The membrane distillation performance was investigated during direct contact membrane distillation and vacuum membrane distillation, and the crystallization behavior of these membranes was observed in real-time. Crystallization on hydrophobic and superhydrophobic membranes differed, with crystal growth occurring as isolated ‘pillars’ on hydrophobic membranes, while crystal deposition and growth remained largely uniform on superhydrophobic membranes. The uniformity of crystal deposition for both membranes increased with the introduction of humic acid to the feed due to the presence of a humic layer across the membrane surface. The rate of deposition was found to be lower for superhydrophobic membranes, and deposited solutes were more easily removed. Crystal nucleation and growth behavior were consistent when using flat sheet membranes, indicating similar crystallization mechanisms for both membrane modules.

[1]  Zhi-Ping Zhao,et al.  Water regeneration from human urine by vacuum membrane distillation and analysis of membrane fouling characteristics , 2013 .

[2]  Mohamed Khayet,et al.  Effect of salt concentration during the treatment of humic acid solutions by membrane distillation , 2004 .

[3]  H. Susanto.  Towards practical implementations of membrane distillation , 2011 .

[4]  K. Sirkar,et al.  Studies on scaling of membranes in desalination by direct contact membrane distillation: CaCO3 and mixed CaCO3/CaSO4 systems , 2009 .

[5]  D. Hou,et al.  Fabrication and characterization of hydrophobic PVDF hollow fiber membranes for desalination through direct contact membrane distillation , 2009 .

[6]  Tzahi Y. Cath,et al.  A scaling mitigation approach during direct contact membrane distillation , 2011 .

[7]  Enrico Drioli,et al.  Trypsin crystallization by membrane-based techniques. , 2005, Journal of structural biology.

[8]  Tzahi Y. Cath,et al.  Sustainable operation of membrane distillation for enhancement of mineral recovery from hypersaline solutions , 2014 .

[9]  Shi-chang Wang,et al.  Study of membrane fouling in cross-flow vacuum membrane distillation , 2014 .

[10]  Tao He,et al.  CF4 plasma surface modification of asymmetric hydrophilic polyethersulfone membranes for direct contact membrane distillation , 2012 .

[11]  Yaolin Liu,et al.  Combined fouling of forward osmosis membranes: Synergistic foulant interaction and direct observation of fouling layer formation , 2012 .

[12]  K. Sirkar,et al.  Effects of antiscalants to mitigate membrane scaling by direct contact membrane distillation , 2009 .

[13]  Enrico Drioli,et al.  Progress in membrane crystallization , 2012 .

[14]  E. Dahlquist,et al.  Fabrication and characterization of superhydrophobic polypropylene hollow fiber membranes for carbon dioxide absorption , 2012 .

[15]  E. Hoek,et al.  Direct observation of initial microbial deposition onto reverse osmosis and nanofiltration membranes , 2008 .

[16]  Corinne Cabassud,et al.  Vacuum membrane distillation of seawater reverse osmosis brines. , 2010, Water research.

[17]  Panagiotis D. Christofides,et al.  Mineral scale monitoring for reverse osmosis desalination via real-time membrane surface image analysis , 2011 .

[18]  Yaolin Liu,et al.  Effects of organic macromolecular conditioning on gypsum scaling of forward osmosis membranes , 2014 .

[19]  Runyu Ma,et al.  The study of continuous membrane crystallization on lysozyme , 2008 .

[20]  Rong Wang,et al.  Optimization of operating conditions for a continuous membrane distillation crystallization process with zero salty water discharge , 2014 .

[21]  M. Gryta,et al.  The influence of polypropylene degradation on the membrane wettability during membrane distillation , 2009 .

[22]  K. Sirkar,et al.  Novel membrane and device for direct contact membrane distillation-based desalination process , 2004 .

[23]  R. Stuetz,et al.  Detailed characterisation of fouling deposition and removal on a hollow fibre membrane by direct observation technique , 2008 .

[24]  Vicki Chen,et al.  Superhydrophobic modification of TiO2 nanocomposite PVDF membranes for applications in membrane distillation , 2012 .

[25]  Hongjie Wang,et al.  Preparation and properties of PTFE hollow fiber membranes for desalination through vacuum membrane distillation , 2013 .

[26]  Marek Gryta,et al.  Influence of polypropylene membrane surface porosity on the performance of membrane distillation process , 2007 .

[27]  Rong Wang,et al.  Engineering superhydrophobic surface on poly(vinylidene fluoride) nanofiber membranes for direct contact membrane distillation , 2013 .

[28]  Hongwei Fan,et al.  Application of PVDF membranes in desalination and comparison of the VMD and DCMD processes , 2012 .

[29]  Hans G.L. Coster,et al.  Direct observation of particle deposition on the membrane surface during crossflow microfiltration , 1998 .

[30]  Jing Zhang,et al.  Fabrication and characterization of superhydrophobic poly (vinylidene fluoride) membrane for direct contact membrane distillation , 2013 .

[31]  Mohamed Khayet,et al.  A framework for better understanding membrane distillation separation process , 2006 .

[32]  Jan Henk Hanemaaijer,et al.  Integrated membrane distillation-crystallization: process design and cost estimations for seawater treatment and fluxes of single salt solutions , 2013 .

[33]  M. Khayet.  Membranes and theoretical modeling of membrane distillation: a review. , 2011, Advances in colloid and interface science.

[34]  Vicki Chen,et al.  Fouling and crystallisation behaviour of superhydrophobic nano-composite PVDF membranes in direct contact membrane distillation , 2014 .

[35]  R. Amal,et al.  Titania nanocomposite polyethersulfone ultrafiltration membranes fabricated using a low temperature , 2011 .

[36]  V. Chen,et al.  Effect of templating agents on the properties and membrane distillation performance of TiO2-coated PVDF membranes , 2014 .

[37]  E. Drioli,et al.  Membrane Distillation and Osmotic Distillation , 2010 .

[38]  Anthony G. Fane,et al.  Membrane distillation crystallization of concentrated salts—flux and crystal formation , 2005 .

[39]  V. Chen,et al.  Evolution of fouling deposition and removal on hollow fibre membrane during filtration with periodical backwash , 2011 .

[40]  B. Bruggen,et al.  Membrane crystallization for the recovery of a pharmaceutical compound from waste streams , 2014 .

[41]  M. Gryta.  Desalination of thermally softened water by membrane distillation process , 2010 .

[42]  John H. Lienhard,et al.  Energy efficiency comparison of single-stage membrane distillation (MD) desalination cycles in different configurations , 2012 .

[43]  Enrico Drioli,et al.  Membrane crystallization of macromolecular solutions , 2002 .