Fouling and its control in membrane distillation—A review

The results show that the contaminant on

Leonard D. Tijing; Yun Chul Woo; June-Seok Choi; Sangho Lee; Seung-Hyun Kim; Ho Kyong Shon

2014

Scholarcy highlights

  • When the feed solution contains foulants, a fouling layer can be formed on the membrane surface, which could provide additional flux resistance
  • Fouling is a persistent problem in areas where water is utilized including desalination, water and wastewater treatment, heat exchangers, and cooling water systems
  • Most of the Membrane distillation papers published in literature focused on the flux performance, and some on the fouling phenomena, but very little can be found on the in-depth study of the actual mechanism behind fouling in MD
  • In order to understand fouling and how to deal with it effectively, more in-depth research and analysis have to be done, especially in differentiating the fouling problem specific for MD operational parameters and mechanisms compared to other membrane-separation processes
  • As MD utilizes bigger pore sizes compared to pressure-driven membrane processes, the pore sizes and pore size distribution must be accounted for in the study of fouling
  • - MD flux improved by 23% after employing coagulation pretreatment in 30 days operation. - NF pretreatment and filtration net prior to module inlet has improved the long-term DCMD performance up to 1100 h. - Bicarbonate ions were found to lower by 2–3 times after boiling water for 15 min. - Boiling only benefits underground waters with high hardness. - APS treatment resulted to high removal of calcium and total hardness. - Flux was improved dramatically after APS treatment, with only 20% flux decline in 300 h. -Significant flux decline was observed for pretreatment - Rapid flux decline was prevented for pretreatment due to removal of protein from boiling - Very limited flux reduction was
  • Additional exploration on the differences in MD fouling formation and mechanism happening on different types of membrane such as flat-sheet, hollow fiber, and most recently, nanofiber membrane should be carried out

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