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논문 상세정보

폐수처리장치에서의 아질산염 산화 세균 군집 분석

Community Analysis of Nitrite-Oxidizing Bacteria in Lab-Scale Wastewater Treatment System

초록

질소는 하수처리과정에서 제거되어야 하는 주요 오염물질 중의 하나이며, 세균 군집을 이용한 고도처리 시스템에서 생물학적 질소제거는 중요한 기술이다. 질산화반응은 생물학적 질소제거 시스템의 첫 단계로 미생물에 의해 진행된다. 암모니아는 암모니아산화세균에 의해 아질산염으로 산화되며, 그 후에 아질산염은 아질산염 산화세균에 의해 질산염으로 산화된다. 실험실 규모의 생물학적 질소제거 시스템인 변형된 eBAF 시스템, Nutrient removal laboratory 시스템과 반추기법을 적용한 rSBR 시스템의 질산화반응조 시료에서 16S rRNA 유전자를 이용한 terminal restriction fragment length polymorphism (T-RFLP) 방법으로 아질산염 산화세균군집을 분석하였다. 제한효소로 형성된 단편의 클러스터분석에서 Nitrobacter 군집은 각각의 폐수처리 시스템에 따라 군집의 차이가 있음이 나타났다. 그러나 Nitrospira 군집의 클러스터분석에서는 액체와 담체의 서식지 환경 차이에 의해 군집이 구분되었다.

Abstract

Nitrogen is one of the major pollutants that should be removed by wastewater treatment systems. Biological nitrogen removal (BNR) is a key technology in advanced wastewater treatment systems operated by bacterial populations. Nitrification is the first step of microbiological processes in BNR system. Ammonia is oxidized to nitrite by ammonia-oxidizing bacteria (AOB) and then nitrite is subsequently oxidized to nitrate by nitrite-oxidizing bacteria (NOB). The diversity of NOB in nitrification reactors of 3 BNR systems, Edited biological aerated filter system, Nutrient removal laboratory system, and the Rumination type sequencing batch reactor system, was investigated by terminal restriction fragment length polymorphism (T-RFLP) analysis of 16S rRNA genes. Cluster analysis of T-RF profiles showed that communities of Nitrobacter group in each system were different depending upon the process of systems. However, the clusters of Nitrospira group were divided by the habitat of aqueous and solid samples.

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