Employing full factorial design and response surface methodology for optimizing direct contact membrane distillation operational conditions in desalinating the rejected stream of a reverse osmosis unit at Esfahan refinery–Iran | Zendy

Mohammad Ebadi | Zendy; Mohammad Reza Mozdianfard | Zendy; M. Khoshvaght-Aliabadi | Zendy

Open Access

Employing full factorial design and response surface methodology for optimizing direct contact membrane distillation operational conditions in desalinating the rejected stream of a reverse osmosis unit at Esfahan refinery–Iran

Author(s) -

Mohammad Ebadi,

Mohammad Reza Mozdianfard,

M. Khoshvaght-Aliabadi

Publication year - 2018

Publication title -

water science and technology water supply

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.318

H-Index - 39

eISSN - 1607-0798

pISSN - 1606-9749

DOI - 10.2166/ws.2018.094

Subject(s) - response surface methodology , factorial experiment , membrane distillation , refinery , reverse osmosis , desalination , volumetric flow rate , permeation , brackish water , fractional factorial design , process engineering , chromatography , environmental engineering , membrane , environmental science , chemistry , engineering , mathematics , ecology , biochemistry , statistics , physics , salinity , quantum mechanics , biology

Optimized condition for desalination of the reverse osmosis (RO)rejected stream from Esfahan Oil Refining Company (EORC) using direct contact membrane distillation (DCMD) with polytetrafluoroethylene (PTFE) membrane was investigated here, having designed a set of 34 experiments using response surface methodology (RSM) and full factorial design (FFD) modelling, carried out in a laboratory scale set-up built for this purpose. Statistical criteria for validation, significance, accuracy and adequacy confirmed the suitability of the quadratic polynomial model employed. Response plots and regression equations suggested that the permeate flux response improved with increased feed temperature, reduced permeate temperature and enhanced feed flow rate. Optimizing DCMD process showed that maximum permeate flux of 60.76 L/m 2 ·h could be achieved at the following optimum operational conditions: feed temperature and flow rate of 70 °C and 2 L/min, respectively, as well as the permeate temperature of 15 °C. At this point the mean annual energy required for 90% water recovery (36 m 3 /h off the RO brackish rejected stream) at EORC refinery was found to be 96GJ, which could be supplied using solar or conventional energy systems at Isfahan, facing a very critical water shortage at present.

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