Modification of bi-composite membrane support layer by macro puncture for membrane distillation application
- Modification of bi-composite membrane support layer by macro puncture for membrane distillation application
- 이석헌; 정성필; 김홍석; 이강호
- Membrane distillation; Modification of support layer; Macro punctures; DCMD; Tensile strength
- Issue Date
- VOL 385, 106-116
- Membrane distillation (MD) is a thermally driven membrane process. For MD application, a hydrophobic and porousmembrane is required. A bi-compositemembrane has been introduced for manyMDapplications because of its superior membrane performance, especially flux. In this research, in order to increase the flux of a commercial bi-composite membrane, various macro punctures were formed in the support layer. The modified MD membranes were tested in a direct contact membrane distillation (DCMD) configuration. The flux of a modified membrane was affected by the size and location of macro punctures and overall porosity in the support layer. The flux of amodifiedmembranewas enhanced up to 27% comparedwith that of pristine membranewhen the size of the macro puncture and overall porosity of the support layer were larger than 20mm2 and 60%, respectively. The overall porosity and size and location of macro punctures in the support layer affected the flux due to the turbulent production in the permeate side. The membrane integritywas checked not only by the tensile strength of the modified membrane samples but also by the long term operation by using the secondary effluent of the wastewater treatment plant as a feed.
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