摘要
对二级出水中典型有机物的膜通量及膜污染变化情况进行分析比较,并应用扩展DLVO(x DLVO)理论分析了有机物超滤过程中的界面作用能对膜污染行为的影响机制.研究表明,海藻酸钠(SA)导致的膜通量下降最为显著,其次为腐殖酸(HA)和牛血清白蛋白(BSA);就3种有机物而言,膜污染均主要发生在粘附阶段,而在粘聚阶段中膜污染程度较小.对比而言,海藻酸钠(SA)主要形成可逆污染,腐殖酸(HA)和牛血清白蛋白(BSA)则以不可逆污染为主.在过滤过程中,极性界面作用能是控制膜污染的主要因素,HA和BSA的极性界面作用能为正值,能抑制膜污染,而SA的极性界面作用能为负值,会加剧膜污染.3种有机物在粘聚阶段的极性界面作用能均大于粘附阶段,说明粘附阶段的膜污染更严重.
This study compares the membrane fouling behaviors as indicated by the membrane flux variation during ultrafiltration（ UF） of typical organics of sodium algienat（ SA）,humic acid（ HA）,and bovine serum albumin（ BSA）,and the extended Derjaguin-Landau-Verwey-Overbeek（ x DLVO）approach is used to quantitatively illustrate the dominant mechanisms involved in. Membrane fouling mainly occurs during the adhesion stage and that in the cohesion stage is relatively low. Comparatively,SA mainly contributes to reversible fouling whereas HA and BSA causes irreversible fouling. The acidbase is the dominant factor to control membrane fouling. The calculated acid-base in the ultrafiltration of HA and BSA is positive and the inhibitive effects on membrane fouling is observed. In the ultrafiltration of SA,however,the acid-base is calculated to be negative and membrane fouling is accelerated accordingly. The acid-base in the adhesion stage is higher than that in the cohesion stage for these three organics,and this supports the more severe membrane fouling in cohesion stage than that in the adhesion stage.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第2期530-536,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.51208021
51278026)~~
关键词
超滤
有机物
膜污染
X
DLVO理论
界面作用
ultrafiltration
organic matter
membrane fouling
x DLVO approach
interfacial interaction
