title: Static adsorptive fouling of extracellular polymeric substances with different membrane materials.
abstract: Adsorptive fouling of microbial extracellular polymeric substances (EPS) greatly influences the fouling behavior and membrane characteristics in a membrane bioreactor (MBR). In this study, adsorptive fouling of the EPS on different membrane materials was compared and adsorptive mechanism between membranes and EPS was investigated by thermodynamic analysis. The results suggested that both the absolute and relative changes of hydraulic resistances should be considered to evaluate fouling of membranes with different materials, and Sips isotherm was the most suitable model to describe the EPS carbohydrate and protein adsorptions on membranes. Thermodynamic analysis showed that both EPS carbohydrate and protein adsorptions were spontaneous (ΔrG(θ) < 0), endothermic (ΔrH(θ) > 0), and entropy driven (ΔrS(θ) > 0). Decreasing ΔrG(θ) values with temperature suggested that EPS adsorptive fouling can be limited by reducing temperature. In addition, physisorption processes and hydrogen bonding interactions between EPS and membranes might play a relatively major role in the adsorption mechanism of EPS on the membrane surface. Atomic force microscopy (AFM) and contact angle analysis confirmed that the adsorptive fouling modified the membrane surface, making the membrane surface more heterogeneous and more hydrophobic.
authors.affiliation: Department of Environmental Engineering, School of Food Engineering, Harbin University of Commerce, Harbin 150076, China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Xinying
authors.initials: X
authors.lastname: Su
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: hittianyu@163.com.
authors.forename: Yu
authors.initials: Y
authors.lastname: Tian
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zuo
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Xiaoyue
authors.initials: X
authors.lastname: Pan
mesh_terms: D000327:Adsorption; D057219:Biofouling; D001704:Biopolymers / Q000737:chemistry*; D002241:Carbohydrates / Q000032:analysis; D005110:Extracellular Space / Q000737:chemistry*; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force; D017711:Nonlinear Dynamics; D011506:Proteins / Q000032:analysis; D012044:Regression Analysis; D013696:Temperature
chemical_list: D001704:Biopolymers; D002241:Carbohydrates; D008567:Membranes, Artificial; D011506:Proteins
keywords: Adsorption isotherm; Adsorptive fouling; Extracellular polymeric substances (EPS); Membrane bioreactor (MBR); Thermodynamic parameters