[Objective] The bacterial strain with cold-tolerance was identified.[Method] In the waste water pool after the production of polyester piece,a bacterial strainA27,which took acetaldehyde as only C-source and was cold-tolerance,was isolated.The degradation character of the strain was analyzed with gas chromatography and spectophotometry after the analysis of its gene sequence of 16S rDNA.[Results] StrainA27 was one kind of Acetobacter pasteurianus,which degradation rate of polyester(500 mg/L) was 77.4% and 1...