文献类型：期刊文献

英文题名：Effect of Aluminum Ions on the Change in Fouling Ability of Foulants: Insights from the Transparent Exopolymer Particles Formation and Determination

作者：Meng, Shujuan[1]; Jin, Jiarou[1]; Li, Yue[1]; Yang, Linyan[2]; Zhang, Meng[3]

机构：[1] School of Materials Science and Engineering, Beihang University, Beijing, 100191, China; [2] School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [3] School of Electronic and Information Engineering, Beihang University, Beijing, 100191, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230378694)

语种：英文

外文关键词：Alginate - Aluminum - Coagulation - Current density - Ions - Membrane technology

摘要：Membrane fouling represents a pivotal concern that imposes limitations on the sustained utilization of membrane technology. Electrocoagulation offers an efficient means of pollutant removal, notable for its chemical-free attributes, thereby introducing a novel approach for mitigating membrane fouling. However, a comprehensive understanding of the specific effects of electrocoagulation on the fouling mechanism is currently lacking. In this study, the influence of electrocoagulation pretreatment on ultrafiltration membrane fouling was investigated via transparent exopolymer particles (TEP) measurement. The results indicated an unexpected trend in the fouling behavior of alginate. Initially, the fouling propensity increased and subsequently decreased with the rise in current density. Staining of TEP revealed that, at low current densities, the TEP size resulting from the presence of low levels of aluminum ions remained small and amorphous, resulting in the development of a dense fouling layer. Conversely, with the increase in current density, the substantial presence of aluminum ions induced alginate polymerization, resulting in the formation of larger and structurally stable TEP, which were more inclined to create fouling layers with considerably lower resistance. Consequently, it was found that it was not the quantity of TEP but the quality of TEP that determined the alginate filtration behavior. Surprisingly, the fouling ability of alginate decreased by a factor of 5.29 following pretreatment with 3 mA/cm2 electrocoagulation, with only an 11% reduction in permeate flux. This study provides evidence that the use of suitable electrocoagulation pretreatment reduces the fouling ability of organic foulants and offers notable advantages in mitigating membrane fouling. ? 2023, The Authors. All rights reserved.