title: Membrane fouling related to microbial community and extracellular polymeric substances at different temperatures.
abstract: An anoxic-aerobic membrane bioreactor was established to investigate the role of microorganisms and microbial metabolites in membrane fouling at different temperatures. The results showed that the membrane fouling cycle at 303, 293, and 283 K were 30, 29, and 5.5 days, respectively. Polysaccharides dominated the extracellular polymeric substances (EPS) and soluble microbial products (SMP) at 303 and 293 K, instead, proteins was the predominant composition of metabolites at 283 K. The correlation coefficient (r(2)) was calculated to identify the relationship between temperature (T), filtration resistance (R) and compositions of EPS and SMP. In biocake, the EPS polysaccharides (EPSc) was the most correlative factor to temperature (T) and filtration resistance (R); in mixed liquor, the ratio of SMP polysaccharides to proteins (SMPc/p) was the most correlative factor. The microbial community structure and the dominant species was the major reason causing the change of EPS and SMP composition.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. gaodw@hit.edu.cn
authors.forename: Da-Wen
authors.initials: DW
authors.lastname: Gao
authors.forename: Zhi-Dan
authors.initials: ZD
authors.lastname: Wen
authors.forename: Bao
authors.initials: B
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Liang
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000145:classification; D019149:Bioreactors; D008567:Membranes, Artificial; D011108:Polymers / Q000737:chemistry*; D013696:Temperature
chemical_list: D008567:Membranes, Artificial; D011108:Polymers
keywords: Extracellular polymeric substances; Membrane bioreactor; Membrane fouling; Microbial community; Soluble microbial products