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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%。
According to the formation of membrane fouling, the effect of sand filter on the pollution of ultrafiltration (UF) membrane was studied. The results showed that the turbidity and the average removal rate of organic matter in the sand filter were 85.81% and 21.54% respectively, which reduced the pollutant load of the subsequent ultrafiltration membrane and slowed down the membrane fouling rate. When the UF was operated in constant flux, There was a reduction in transmembrane pressure drop (TMP) for follow-up UF operation of about 1/2 of that of the non-sand filter with an average of -17.43 k Pa; and it also effectively reduced the membrane fouling rate during the initial UF run, which was about At the same time, the UF outer membrane and membrane resistance decreased by about 62.54% and 52.04% after UF operation for the same time, while the presence of sand filter reduced UF under constant pressure , The decay rate of membrane flux is small with the increase of operating time and the decay rate of flux is almost zero at low pressure. The initial operating flux is about 60 L / (m ~ 2 · h). After 30 days, the decay rate of membrane flux was about 13.2% in the presence of sand filter and 28.6% in the absence of sand filter.