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Fouling in direct contact membrane distillation of produced water from unconventional gas extraction.pdf
Journal of Membrane Science 524 (2017) 493–501
Contents lists available at ScienceDirect
Journal of Membrane Science
journal homepage: /locate/memsci
Fouling in direct contact membrane distillation of produced water from unconventional gas extraction
Omkar R. Lokarea, Sakineh Tavakkolia, Shardul Wadekarb, Vikas Khannaa, Radisav D. Vidica,?
a Department of Civil and Environmental Engineering, University of Pittsburgh, 3700 O’Hara Street, 742 Benedum Hall, Pittsburgh, PA 15261, United States b Department of Chemical and Petroleum Engineering, University of Pittsburgh, 3700 O’Hara Street, 742 Benedum Hall, Pittsburgh, PA 15261, United States
MARK
ARTICLE INFO
Keywords: Direct contact membrane distillation Produced water Fouling Membrane properties
ABSTRACT
Hydraulic fracturing used for natural gas extraction from unconventional onshore resources generates large quantities of produced water that needs to be managed e?ciently and economically to ensure sustainable development of this industry. Membrane distillation can serve as a cost e?ective method to treat produced water due to its low energy requirements, especially if waste heat is utilized for its operation. This study evaluated the performance of commercially available hydrophobic micro?ltration membranes in a direct contact membrane distillation system for treating very high salinity (i.e., up to 300,000 mg/L total dissolved solids) produced water. Polypropylene and polytetra?uoroethylene membranes yielded the highest permeate ?ux with membrane distillation coe?cient of 5.6 l/m2/hr/kPa (LMH/kPa). All membranes showed excellent rejection of dissolved ions, including naturally occurring radioactive material (NORM), which is a signi?cant environmental concern with this high salinity wastewater. Analysis of membranes after extended testing with actual produced waters revealed unevenly distributed inorganic deposits with signi?cant iron content. A key ?nding of this study is that the iron oxide fouling layer had negli
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