A study of membrane surface modified by titanium dioxide
Date Issued
2006
Date
2006
Author(s)
Huang, Wei-Jie
DOI
zh-TW
Abstract
Photocatalytic membrane reactors using titanium dioxide immobilized on ceramic membrane were utilized to improve flux decline by humic acid. Different parameters such as TOC concentration (2 and 9 mg/L), transmembrane pressure(70, 100 and 140 kPa), crossflow velocity(0.22, 0.10 and 0.05 m/sec) and pore size(0.14 μm and 50 kD) are used to observe the influences of flux decline, TOC rejection and the amount of foulent on membrane’s surface.
After 8 hours ultrafiltration, the flux of porous titanium dioxide membrane decayed to 39% when TOC concentration is 9 mg/L, transmembrane pressure is 100 kPa and crossflow velocity is 0.22 m/sec. Otherwise, the flux of membrane without modification decayed to 3%. On the contrary, the former has no obviously influence on TOC rejection which is considered to be caused by membrane fouling degraded into smaller molecular weight by photocatalytic reaction. The smaller molecule can pass through the membrane, so the TOC concentration increased.
The higher transmembrane pressure is used, the more amount of humic acid pass through the membrane. Therefore, the amount of foulent accumulated on membrane surface much more and the permeate flux will decrease relatively.
The speed of crossflow velocity means that the retention time of humic acid staying at module. It will result greater influence on membrane’s fouling and permeate flux.
In addition, we expected that the smaller pore size of membrane(50 kD) can intercept more humic acid. However it has a drawback of coating uniformly, thus the TOC rejection was not increased.
Subjects
膜面改質
光催化反應
腐質酸
多孔性二氧化鈦薄膜
延緩通量衰減
Membrane modification
Photocatalysis
Humic acid
Porous titanium dioxide membrane
Improve flux decline
Type
thesis
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