CAJ | 학술논문

针对浸没式中空纤维膜微滤过程中颗粒物污染膜的情况,提出采用鼓泡、反冲洗以及鼓泡和反向脉冲清洗联合使用的方法和措施来减缓或消除膜污染.实验结果表明,鼓泡的作用在于减少膜表面颗粒物的堆积,在鼓泡气量为300mL/min的条件下,鼓泡可以使滤饼阻力减少到原来的40%.而周期性的反冲洗,如每过滤10min反冲洗4min条件下,使得膜内部污染阻力下降到不带反冲洗条件下的1/3.反向脉冲清洗(每过滤10 min反向脉冲清洗30 B)和鼓泡(气量为160mL/min)的联合使用是本系统的最优膜污染控制方法,可以使滤饼阻力和膜内部污染阻力分别降低到没有任何膜污染控制措施下的10%和20%.
침대침몰식중공섬유막미려과정중과립물오염막적정황,제출채용고포、반충세이급고포화반향맥충청세연합사용적방법화조시래감완혹소제막오염.실험결과표명,고포적작용재우감소막표면과립물적퇴적,재고포기량위300mL/min적조건하,고포가이사려병조력감소도원래적40%.이주기성적반충세,여매과려10min반충세4min조건하,사득막내부오염조력하강도불대반충세조건하적1/3.반향맥충청세(매과려10 min반향맥충청세30 B)화고포(기량위160mL/min)적연합사용시본계통적최우막오염공제방법,가이사려병조력화막내부오염조력분별강저도몰유임하막오염공제조시하적10%화20%.
This study is aimed at improving the particle fouled submerged hollow fiber membrane microfiltration process by employing several methods to alleviate or eliminate membrane fouling. The total resistance in microfiltra-tion can he classified into clean membrane resistance R_m, cake resistance Ro and membrane internal fouling resist-ance R_i. It was found that gas bubbling is helpful in reducing particle deposition on the membrane surface, e.g. R_c was only 40% of that without bubbling when the gas flow rate was 300 mL/min. Periodic backwashing could mainly mitigate internal fouling of the membrane, e.g. under conditions of 4 min backwashing for every 10 min filtration, R_i was 33% of that without backwashing. The combination of backpulsing (30 s backpulsing for every 10 min filtra-tion) and gas bubbling (with a gas flow rate of 160 mL/min) was found to he the optimal strategy for this sub-merged microfihration system; under these conditions the values of R_c and R_i were just 10% and 20% of the corre-sponding values without employing any membrane fouling controlling method.