title: Improved PVDF membrane performance by doping extracellular polymeric substances of activated sludge.
abstract: Polyvinylidene fluoride (PVDF) membrane has been widely applied in water and wastewater treatment because of its high mechanical strength, thermal stability and chemical resistance. However, the hydrophobic nature of PVDF membrane makes it readily fouled, substantially reducing water flux and overall membrane rejection ability. In this work, an in-situ blending modifier, i.e., extracellular polymeric substances (EPS) from activated sludge, was used to enhance the anti-fouling ability of PVDF membrane. Results indicate that the pure water flux of the membrane and its anti-fouling performance were substantially improved by blending 8% EPS into the membrane. By introducing EPS, the membrane hydrophilicity was increased and the cross section morphology was changed when it interacted with polyvinl pyrrolidone, resulting in the formation of large cavities below the finger-like pores. In addition, the fraction of pores with a size of 100-500 nm increased, which was also beneficial to improving membrane performance. Surface thermodynamic calculations indicate the EPS-functionalized membrane had a higher cohesion free energy, implying its good pollutant rejection and anti-fouling ability. This work provides a simple, efficient and cost-effective method to improve membrane performance and also extends the applications of EPS.
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China.
authors.forename: Yan-Fang
authors.initials: YF
authors.lastname: Guan
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China.
authors.forename: Bao-Cheng
authors.initials: BC
authors.lastname: Huang
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Qian
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China.
authors.forename: Long-Fei
authors.initials: LF
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China. Electronic address: hqyu@ustc.edu.cn.
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D001704:Biopolymers / Q000737:chemistry; D019149:Bioreactors; D008567:Membranes, Artificial; D011108:Polymers; D012722:Sewage / Q000737:chemistry*
chemical_list: D001704:Biopolymers; D008567:Membranes, Artificial; D011108:Polymers; D012722:Sewage
keywords: Anti-fouling; Extracellular polymeric substances (EPS); Filtration; Membrane; Polyvinylidene fluoride; Wastewater treatment