Analysis of Humic Acid Fouling during Ultrafiltration Using a Resistance in Series Model

• Main Authors: Kuo, Shyue Wen, 郭學文
• Other Authors: Lin, Cheng Fang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/16233329807302947480

碩士 === 國立臺灣大學 === 環境工程學研究所 === 90 === The effects of operational parameters on the permeate flux and resistances for ultrafiltration of humic acid were studied. The experiments were carried out on polysulfone hollow fiber membrane module. Ultrafiltration behaviors were analyzed by the resistance-in-series model. The results showed that flux increased with transmembrane pressure from 10 to 20 psi and membrane pore size from 1k to 30k. Compared with membrane intrinsic resistances (RM), it was observed that 10k membrane was similar to 30k membrane and much different to 1k membrane. After ultrafiltration of 24 hours, the tendency of accumulated irreversible resistance was more significant at 30k membrane than 10k and 1k membrane. In the resistance-in-series model, permeate flux decreases with the increase of resistances caused by fouling phenomenea (RF) and concentration polarization/gel layer formation (RG). The polarization layer resistance is a function of transmembrane pressure : RG = φ×PT, andφ is resistance index. In 660 minutes operation, RF andφall increased with tme. The increase rate of φ was higher at 1k membrane than other membranes. The tandency of accumulated RF was similar to irreversible resistance. After filtration of 660 minutes, RM still was the most important resistance at 1k membrane and 30k membrane was accumulated lots resistance in filtration process.