Biotechnology Bulletin ›› 2019, Vol. 35 ›› Issue (5): 109-117.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0178

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Degradation of Ethyl Formate by Aeromonas salmonicida subsp.salmonicida

ZHANG Shan-shan, YAO Xiao-long, WANG Ke, YOU Ya   

  1. Beijing Technology and Business University,Beijing 100048
  • Received:2019-03-04 Online:2019-05-26 Published:2019-05-23

Abstract: Ethyl formate is widely present in wastewater from the chemical industry and is very harmful to both organisms and the environment. Microbial degradation is one of the important approaches for the treatment of ethyl formate. In this study,a strain of ETH-3 capable of degrading ethyl formate was screened from activated sludge by enrichment culture method and plate scribing method. Then,the strain was identified as Aeromonas salmonicida subsp. salmonicida by morphological observation,physiological and biochemical tests and 16S rDNA identification. The optimal growth conditions of strain ETH-3 and its ability to degrade ethyl formate were determined by shake flask test. The results showed that the optimal growth temperature of the strain was 25-30℃,and the optimal growth pH was about 8. The strain had strong ability to degrade ethyl formate. At 30℃,the degradation of 0-10 500 mg/L ethyl formate was completely degraded within 36 h. Analysis of metabolites by GC-MS revealed that ethyl formate was first metabolized by microorganisms to formic acid and ethanol,and then formic acid and ethanol were further degraded by microorganisms into CO2 and H2O.

Key words: ethyl formate, biodegradation, Aeromonas salmonicidal subsp salmonicida