摘要
针对膜污染的形成种类,研究了砂滤池对超滤(UF)膜污染的影响。结果表明,砂滤池对浊度和有机物的平均去除率分别为85.81%和21.54%,降低了后续超滤膜污染物负荷,减缓了膜污染速率;UF在恒通量运行时,砂滤池的存在使得后续UF运行跨膜压差(TMP)降低,约为无砂滤池时的1/2,平均为-17.43 k Pa;且其也使得UF初始运行阶段的膜污染速率有效降低,约为无砂滤池时的1/3;同时,UF运行相同的时间后,砂滤池的存在使得UF膜外及膜内阻力减小了约62.54%和52.04%;UF在恒压条件下运行时,随着运行时间的延长,砂滤池存在时膜通量衰减速率较小,低压力运行时通量衰减速率几乎为0;在-50 k Pa压力下,初始运行通量约为60 L/(m^2·h),30 d后砂滤池存在时膜通量衰减率约为13.2%,而无砂滤池时衰减率为28.6%。
Effect of a sand filter on the fouling of ultrafiltration（UF） membrane was studied on the types of the fouling mechanism. The results showed that the average removal rate of turbidity and organic matter were 85.81% and 21.54% in the sand filter, which greatly reduce the follow-up UF membrane fouling load, and the process effectively slow the rate of membrane fouling. With the same flux, the average TMP of UF is about-17.43 k Pa when the sand filter exists, which was about a half of the number when having not sand filter. Meanwhile, the presence of sand filter makes the membrane fouling rate which was in the initial phase slowed down about 1/3 times. And with running the same time, the membrane resistance of inside and outside membrane decrease by 62.54% and 52.04%.Under the condition of constant pressure, with the extension of time, the decay rate of membrane flux is low when sand filter exists, which was almost 0 under low pressure. When running at the speed of-50 k Pa, flux is about 60 L/（m2·h）, the decay rate of membrane flux is about 13.2% after 30 d in the sand filter. While under the same condition, without the sand filter, the decay rate of membrane flux is about 28.6%.
出处
《水处理技术》
CAS
CSCD
北大核心
2016年第5期113-116,共4页
Technology of Water Treatment
基金
广州市自来水科技攻关计划项目([2014]专-013号)
关键词
超滤
浓差极化
跨膜压差
膜通量
ultrafiltration
concentration polarization
transmembrane pressure
flux
