Evaluation of a real-time visualization system for scaling detection during DCMD, and its correlation with wetting

Title
Evaluation of a real-time visualization system for scaling detection during DCMD, and its correlation with wetting
Authors
이석헌정성필김혜원윤택근강경철홍승관
Keywords
Membrane distillation; Wetting; Fouling; Visualization system; Real-time observation
Issue Date
2019-03
Publisher
Desalination
Citation
VOL 454-70
Abstract
A visualization system was designed for a real-time observation of scales during direct contact membrane distillation (DCMD). The system was composed of a MD module, a camera and light sources. Firstly, visibility of the scales with the system and correlation between detected spots and wetting were assessed during the MD process using a polyvinylidene fluoride (PVDF) 0.45 μm membrane. The white spots were observed in the captured images from the visualization system and got broader with the electrical conductivity (EC) increase in permeate. It was verified that the spots indicated the pores blocked by the CaSO4 scales. The wetting occurred through the white spots if the pressure was applied. Therefore, the high wetting potential area could be identified with the suggested visualization system during the MD operation in real-time. The visualization system was applied to the MD process under different permeate temperatures (20 and 55 °C). The visualization system successfully detected the pore blocking related with different scale formation according to the temperatures at the membrane surface.
URI
http://pubs.kist.re.kr/handle/201004/68932
ISSN
0011-9164
Appears in Collections:
KIST Publication > Article
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