Qatar’s primary source of fresh water is through seawater desalination. Amongst the major processes that are commercially available on the market, the most common large scale techniques are Multi-Stage Flash distillation (MSF), Multi Effect distillation (MED), and Reverse Osmosis (RO). Although commonly used, these three processes are highly expensive down to high energy input requirements and high operating costs allied with maintenance and stress induced on the systems in harsh alkaline media. Beside that cost, environmental footprint of these desalination techniques are significant; from damaging marine eco-system, to huge land use, to discharge of tons of GHG and huge carbon footprint. Other less energy consuming techniques based on membrane separation are being sought to reduce both the carbon footprint and operating costs is membrane distillation (MD). Emerged in 1960s, MD is an alternative technology for water desalination attracting more attention since 1980s. MD process involves the evaporation of a hot feed, typically below boiling point of brine at standard conditions, by creating a water vapor pressure difference across the porous, hydrophobic membrane. Main advantages of MD compared to other commercially available technologies (MSF and MED) and specially RO are reduction of membrane and module stress due to absence of trans-membrane pressure, less impact of contaminant fouling on distillate due to transfer of only water vapor, utilization of low grade or waste heat from oil and gas industries to heat up the feed up to required temperature difference across the membrane, superior water quality, and relatively lower capital and operating cost. To achieve the objective of this study, state of the art flat-sheet cross-flow DCMD bench scale unit was designed, commissioned, and tested. The objective of this study is to analyze the characteristics and morphology of the membrane suitable for DCMD through SEM imaging and contact angle measurement and to study the water quality of distillate produced by DCMD bench scale unit. Comparison with available literature data is undertaken where appropriate and laboratory data is used to compare a DCMD distillate quality with that of other desalination techniques and standards. Membrane SEM analysis showed that the PTFE membrane used for the study has contact angle of 127º with highly porous surface supported with less porous and bigger pore size PP membrane. Study on the effect of feed solution (salinity) and temperature on water quality of distillate produced from ICP and IC analysis showed that with any salinity and different feed temperature (up to 70ºC) the electric conductivity of distillate is less than 5 μS/cm with 99.99% salt rejection and proved to be feasible and effective process capable of consistently producing high quality distillate from very high feed salinity solution (i.e. 100000 mg/L TDS) even with substantial quality difference compared to other desalination methods such as RO and MSF., {"references":["\"Power in the GCC.\" Kippreport 8 Feb. 2010: 28.","Alhajri, K, and L Almisned. \"Water Resources In The GCC Countries: A\nStrategic Option.\" Renewable Energy 5.1-4 (1994): 524-528.","Al. Ansari, Mohammed Saleh . \"Concentrating Solar Power to Be Used\nin Seawater Desalination within the Gulf Cooperation Council.\" Energy\nand Environment Research 3 (2013): 1-23.","Dawoud, Mohamed A., and Mohamed M. Al Mulla. \"Environmental\nImpacts of Seawater Desalination: Arabian Gulf Case Study.\"\nInternational Journal of Environment and Sustainability 1.3 (2012): 22-\n37.","Corrado, Sommariva. \"Basic Design of Thermal Desalination Process.\"\nWorkshop. Global Water Sustainability Center. Qatar Science and\nTechnology Park, Doha. 6 Dec. 2011. Class lecture.","Al-Darwish, AbdulMonem. \"Qatar's Strategy in the Sustainable\nDevelopment of Water Resources.\" COP 18. KAHRAMA. QNCC, Doha.\n28 Nov. 2012. Speech.","Adham, Samer, Altaf Hussain, Joel MinierMatar, Raul Dores, and Arnold\nJanson. \"Application of Membrane Distillation for desalting brines from\nthermal desalination plants.\" Desalination 314 (2013): 101-108.","Lattemann, Sabine, and Thomas Hopner. \"Environmental Impact and\nimpact assessment of seawater desalination.\" Desalination 220 (2008): 1-\n15.","Charcosset, Catherine. \"A Review of Membrane Processes and\nRenewable Energies for Desalination.\" Desalination 245.1-3 (2009): 214-\n231.\n[10] Lawson, K. \"Membrane Distillation. I. Module Design and Performance\nEvaluation Using Vacuum Membrane Distillation.\" Journal of Membrane\nScience 120 (1996): 111-121.\n[11] Martinez, L, and F Floridodiaz. \"Theoretical and Experimental Studies on\nDesalination Using Membrane Distillation1.\" Desalination 139.1-3\n(2001): 373-379.\n[12] J. Phattaranawik and R. Jiraratananon, \"Direct contact membrane\ndistillation: effect of mass transfer on heat transfer\", J. Membrane Sci.\n188 (2001), 137-146.\n[13] Lawson, K, and D Lloyd. \"Membrane Distillation.\" Journal of Membrane\nScience 124 (1997): 1-25.\n[14] Elbourawi, M, Z Ding, R Ma, and M Khayet. \"A Framework for Better\nUnderstanding Membrane Distillation Separation Process.\" Journal of\nMembrane Science 285.1-2 (2006): 4-29.\n[15] Martinez-Diez, F. J. Florido-Diaz, Theoretical and experimental studies\non desalination using membrane distillation, Desalination. 139 (2001)\n373-379.\n[16] L. Martinez-Diez, F. J. Florido-Diaz, M. I. Vazquez-Gonzalez, Study of\nevaporation efficiency in membrane distillation, Desalination. 126 (1999)\n193-198.\n[17] P.K. Weyl, (1967), \"Recovery demineralized water from saline waters\".\nUnited States Patent 3,340,186.\n[18] Zeaman, Leos J., Zydney, Andrew L., Microfiltration and Ultrafiltration,\nPrinciples and Applications., New York: Marcel Dekker, Inc, 1996.\n[19] Cath, T. \"Experimental Study Of Desalination Using Direct Contact\nMembrane Distillation: A New Approach To Flux Enhancement.\"\nJournal of Membrane Science 228.1 (2004): 5-16.\n[20] Baek, Youngbin ,Junil Kang, Patrick Theato, and Jeyong Yoon.\n\"Measuring hydrophilicity of RO membranes by contact angles via\nsessile drop and captive bubble method: A comparative study.\"\nDesalination 303 (2012): 23–28.\n[21] Camacho, Lucy Mar ,LudovicDumée, Jianhua Zhang Zhang, Jun-de Li,\nMikel Duke, Juan Gomez, and Stephen Gray. \"Advances in Membrane\nDistillation for Water Desalination and Purification Applications.\" Water\n5 (2013): 94-196.\n[22] Zhang, Jianhua, Noel Dow, Mikel Duke, Eddy Ostarcevic, Jun-De Li,\nand Stephen Gray. \"Identification of Material And Physical Features Of\nMembrane Distillation Membranes For High Performance Desalination.\"\nJournal of Membrane Science 349.1-2 (2010): 295-303.\n[23] J. Zhang, N. Dow, M. Duke, E. Ostarcevic, J.-D. Li, S. Gray,\nIdentification ofmaterial and physical features of membrane distillation\nmembranes for high performance desalination, Journal of Membrane\nScience. 349(2010): 295-303.\n[24] Hwang, Ho Jung, Ke He, Stephen Gray, Jianhua Zhang, and IlShik\nMoon. \"Direct Contact Membrane Distillation (DCMD): Experimental\nStudy on The Commercial PTFE Membrane And Modeling.\" Journal of\nMembrane Science 371.1-2 (2011): 90-98.\n[25] Zhu, Hailin ,Hongjie Wang, Feng Wang, YuhaiGuo, and Huapeng\nZhang. \"Preparation and properties of PTFE hollow fiber membranes for\ndesalination through vacuum membrane distillation.\" Journal of\nMembrane Science 446 (2013): 145-153\n[26] Wenzel, Robert N.. \"Resistance of Solid Surfaces To Wetting By Water.\"\nIndustrial & Engineering Chemistry 28.8 (1936): 988-994.\n[27] Adnan, Sharmiza ,Manh Hoang, and Huanting Wang. \"Commercial\nPTFE membranes for membrane distillation application: Effect of\nmicrostructure and support material.\" Desalination 284 (2012): 297–308."]}