Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Removal of Perchlorate from Salt Water Using Microorganisms

미생물을 이용한 염수의 퍼클로레이트 제거

  • Ahn, Yeonghee (Department of Environmental Engineering, Dong-A University)
  • 안영희 (동아대학교 공과대학 환경공학과)
  • Received : 2019.11.20
  • Accepted : 2019.11.28
  • Published : 2019.11.30
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Abstract

Perchlorate is an anionic pollutant that is very soluble and stable in water. It has been detected not only in soil/ground water but also in surface water, drinking water, food, fish, and crops. Perchlorate inhibits iodine uptake by the thyroid gland and reduces production of thyroid hormones that are primarily responsible for regulation of metabolism. Although various technologies have been developed to remove perchlorate from the environment, biodegradation is the method of choice since it is economical and environmentally friendly. However there is limited information on perchlorate biodegradation in salt environment such as salt water. Therefore this paper reviews biodegradation of perchlorate in salt water and related microorganisms. Most biodegradation research has employed heterotrophic perchlorate removal using organic compounds such as acetate as electron donors. Biodegradation research has focused on perchlorate removal from spent brine generated by ion exchange technology that is primarily employed to clean up perchlorate-contaminated ground water. Continuous removal of perchlorate at up to 10% NaCl was shown when bioreactors were inoculated with enriched salt-tolerant perchlorate-reducing bacteria. However the reactors did not show long-term stable removal of perchlorate. Microorganisms belonging to ${\beta}$- and ${\gamma}$-Proteobacteria were dominant in bioreactors used to remove perchlorate from salt water. This review will help our understanding of perchlorate removal from salt water to develop a decent biotechnology for the process.

퍼클로레이트는 물에 용해도가 높고 안정되어 잔류하는 음이온성 오염물이다. 이 오염물은 토양/지하수는 물론 지표수, 먹는물, 식품, 어류, 농작물에도 검출이 되었다. 퍼클로레이트는 갑상선에 요오드가 흡수되는 것을 방해함으로써 대사조절에 중요한 갑상선 호르몬 생산을 감소시키는 것으로 알려졌다. 오염된 환경으로부터 퍼클로레이트를 제거하기 위한 다양한 기술이 개발되었으나 미생물에 의한 생분해가 가장 환경 친화적이고 경제적인 것으로 알려졌다. 그러나 염수와 같은 염이 있는 환경에서의 퍼클로레이트 생분해에 대한 정보는 비교적 제한적이다. 본 논문에서는 미생물을 이용한 염수의 퍼클로레이트 제거와 이와 관련된 미생물에 대해 기술하였다. 대부분 염수의 퍼클로레이트 생분해 연구는 acetate와 같은 유기물을 전자공여체로 사용하는 종속영양방식으로 이루어졌으며 폐재생액(염수) 내의 퍼클로레이트 처리에 중점을 두었다. 폐재생액은 퍼클로레이트로 오염된 지하수를 정화하는데 주로 사용되는 이온교환법에서 발생한다. 내염성 미생물을 농화배양하여 식종한 생물반응기를 통해 최고 10% NaCl 농도에서도 퍼클로레이트의 연속제거가 가능한 것으로 보고되었으나 장기적으로 안정적인 제거는 제시되지 않았다. 염수 내의 퍼클로레이트 제거에 사용된 생물반응기에는 주로 ${\beta}$-와 ${\gamma}$-Proteobacteria가 우세한 것으로 나타났다. 본 논문에서 기술한 이러한 정보는 생물공학기술 개발을 위해 염수의 퍼클로레이트 생분해에 대한 이해를 하는데 도움을 줄 것이다.

Keywords

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