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首页> 外文期刊>Separation and Purification Technology >Assessing the fouling mechanisms of high-pressure nanofiltration membrane using the modified Hermia model and the resistance-in-series model
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Assessing the fouling mechanisms of high-pressure nanofiltration membrane using the modified Hermia model and the resistance-in-series model

机译:使用改进的Hermia模型和串联电阻模型评估高压纳滤膜的结垢机理

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摘要

The fouling phenomenon and associated fouling mechanisms of the cross-flow type nanofiltration membrane were investigated using the modified Hermia empirical model and the resistance-in-series model. The effects of pH on membrane permeate flux and the rejection of natural organic matter (NOM) were also studied. Natural water and the effluent of a rapid sand filter (SF) were used as the source waters. The results showed that when the raw water was treated, the highest flux decline occurred at pH 5 due to weak electrostatic repulsion between the charged membrane and NOM. Moreover, a two-step fouling process in flux decline before 7 h and after 7 h was observed during the treatment of the raw water. Ultimately, physically reversible rather than irreversible fouling was the main fouling mechanism. Standard blocking was not a fouling mechanism for either of the water samples treated at any pH level, indicating that the foulants were not adsorbed onto the inner walls of membrane pores. For raw water, intermediate blocking was the major fouling mechanism at all pH levels, whereas for the SF effluent, gel layer formation played the major role in membrane fouling at all pH levels.
机译:利用改进的Hermia经验模型和串联电阻模型研究了错流型纳滤膜的结垢现象及相关的结垢机理。还研究了pH对膜渗透通量和天然有机物(NOM)截留的影响。天然水和快速砂滤器(SF)的出水用作来源水。结果表明,当处理原水时,由于带电膜和NOM之间的弱静电排斥,在pH 5时出现最大通量下降。此外,在原水处理过程中,观察到了在7小时之前和7小时之后通量下降的两步污染过程。最终,主要的结垢机理是物理可逆而不是不可逆结垢。对于在任何pH值条件下处理的任何水样品,标准阻塞都不是结垢机制,这表明结垢物未吸附到膜孔的内壁上。对于原水,中间阻塞是在所有pH值水平下的主要污垢机理,而对于SF废水,凝胶层的形成在所有pH值下膜污染中均起主要作用。

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