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Analysis of a Sulfur-oxidizing Perchlorate-degrading Microbial Community

황 산화를 통해 퍼클로레이트를 분해하는 미생물 군집 분석

Kim, Young-Hwa;Han, Kyoung-Rim;Hwang, Heejae;Kwon, Hyukjun;Kim, Yerim;Kim, Kwonwoo;Kim, Heejoo;Son, Myunghwa;Choi, Young-Ik;Sung, Nak-Chang;Ahn, Yeonghee
김영화;한경림;황희재;권혁준;김예림;김건우;김희주;손명화;최영익;성낙창;안영희

  • Received : 2015.08.15
  • Accepted : 2015.10.07
  • Published : 2016.01.30

Abstract

Perchlorate (ClO4) is an emerging pollutant detected in surface water, soil, and groundwater. Previous studies provided experimental evidence of autotrophic ClO4 removal with elemental sulfur (S0) particles and activated sludge, which are inexpensive and easily available, respectively. In addition, ClO4 removal efficiency was shown to increase when an enrichment culture was used as an inoculum instead of activated sludge. PCR-DGGE was employed in the present study to investigate the microbial community in the enrichment culture that removed ClO4 autotrophically. Microorganisms in the enrichment culture showed 99.71% or more ClO4 removal efficiency after a 7-day incubation when the initial concentration was approximately 120 mg ClO4/l. Genomic DNA was isolated from the enriched culture and its inoculum (activated sludge), and used for PCR-DGGE analysis of 16S rRNA genes. Microbial compositions of the enrichment culture and the activated sludge were different, as determined by their different DGGE profiles. The difference in DGGE banding patterns suggests that environmental conditions of the enrichment culture caused a change in the microbial community composition of the inoculated activated sludge. Dominant DGGE bands in the enrichment culture sample were affiliated with the classes β-Proteobacteria, Bacteroidetes, and Spirochaetes. Further investigation is warranted to reveal the metabolic roles of the dominant populations in the ClO4 degradation process, along with their isolation.

Keywords

Bacterial community;enrichment culture;elemental sulfur;perchlorate;PCR-DGGE

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