Application of Nanofiltration Membrane for Calcium Sulfate and Natural Organic Matter Removal


  • Apinya Onsarn Chemical Engineering Department, Faculty of Engineering, Ubon Ratchathani University
  • Supatpong Mattaraj Chemical Engineering Department, Faculty of Engineering, Ubon Ratchathani University
  • Wipada Dechapanya Chemical Engineering Department, Faculty of Engineering, Ubon Ratchathani University
  • Karnika Ratanapongleka Chemical Engineering Department, Faculty of Engineering, Ubon Ratchathani University
  • Tiammanee Rattanaweerapan Chemical Engineering Department, Faculty of Engineering, Ubon Ratchathani University
  • Sompop Sanongraj Chemical Engineering Department, Faculty of Engineering, Ubon Ratchathani University


Nanofiltration membrane, Ionic strengths, Calcium sulfate, Natural Organic Matter (NOM), Flux decline


The objective of this research was to study the removal efficiency of calcium sulfate and natural organic matter (NOM) using nanofiltration membrane. The membrane sheets used were obtained from GE Water & Process Technologies (model HL4040HM).  The filtration experiments were determined by a dead-end filtration membrane. Factors studied were ionic strengths of calcium sulfate, pH and combined effects between calcium sulfate and NOM. The experimental results revealed that increased ionic strengths of calcium sulfate provided higher flux decline, possibly increased concentrations of calcium sulfate, thus decreased permeate flow. Solutions having high ionic concentration of 0.015 M resulted in the highest sulfate removal about 97%, thus enhancing accumulation of calcium sulfate on the membrane surface.  The pH effects caused calcium and sulfate removal ranging from 71% to 93 %. For combined effects between calcium sulfate and NOM, it was found that fluxes and rejection efficiencies (both calcium and sulfate rejections) showed lower values than those without NOM.


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How to Cite

A. . Onsarn, S. . Mattaraj, W. . Dechapanya, K. . Ratanapongleka, T. . Rattanaweerapan, and S. . Sanongraj, “Application of Nanofiltration Membrane for Calcium Sulfate and Natural Organic Matter Removal”, Ladkrabang Engr J, vol. 39, no. 2, pp. 70–81, Jun. 2022.



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