Comparison on the performances of VMD and DCMD in desalination

• Main Authors: Kuo-Lin Yeh, 葉國麟
• Other Authors: Tung-Wen Cheng
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/57092127676315724279

碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 100 === The flat PTFE membrane and hollow fiber PVDF membrane were used in studying on the flux performance in the operating of DCMD and VMD. Operating parameters included temperature difference, feed flow rate, module inclination angle, gas flow rate. The convex design in the feed chance was also included. The experimental results show that increasing the temperature difference will increase the permeate flux, but also heighten the polarization phenomena. The performance of Increasing feed flow in DCMD system higher than VMD system. In DCMD system, the permeate flux increased, and reached a maximum at about 45°. Aeration in DCMD system can enhance the flux, but VMD in the angle greater than 45o aeration will be effective. It is noted that the convex design in the feed channel as module inclined increases the shear stress on the membrane, thus, effectively reduces the polarization phenomena and increases the permeate flux. The flux enhancement in DCMD and VMD were improved to about 37.3% and 15.8% percent.