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Effect of organic molecular weight distribution on membrane fouling in an ultrafiltration system with ozone oxidation, in the perspective of interaction energy

Abstract

The effect of molecular weight (MW) distribution on ultrafiltration (UF) membrane fouling was investigated using humic acids, the mechanism explored by extended Derjaguin-Laudau-Verwey-Overbeek (XDLVO) theory. The short-ranged acid-base (AB) interaction energy was found dominant, followed by Van der Waals (LW), while electrostatic (EL) interaction energy was negligible. The organic colloid fractions with MW > 100 kDa contributed mainly to transmembrane pressure (TMP) increase, while the fractions < 1 kDa had less influence on membrane fouling due to its strong hydrophilicity, oleophobicity and polarity. However, there was no observed relationship between the MW size and its contribution to TMP increase, indicating the total interaction energy between organic colloids and membrane material was favor of prediction of membrane fouling compared with some characteristics of organics. Water from Yangtze River was ozonized prior to UF for the fouling control. With the addition of ozone, the proportion of organic fraction < 1 kDa increased, causing decreased absolute value of AB interaction energy between colloid and membrane. The inflection point of interaction energy variation was attained at 0.8 mg/L ozone dosage, corresponding to a slow rise in TMP as the increasing ozone dosage, while the least influent organic matter was attained with 1.2 mg/L. This indicated that it was more feasible to optimize ozone dosage according to interaction energy rather than the concentration of influent organic matter.

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Publication details

The article was received on 28 Jun 2017, accepted on 13 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7EW00212B
Citation: Environ. Sci.: Water Res. Technol., 2017, Accepted Manuscript
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    Effect of organic molecular weight distribution on membrane fouling in an ultrafiltration system with ozone oxidation, in the perspective of interaction energy

    Y. Tan, T. Lin, W. Chen and D. Zhou, Environ. Sci.: Water Res. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7EW00212B

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