Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Analysis and improvement measures of nitrification using industrial wastewater with high Nikel concentration

고농도 니켈을 함유한 산업하수의 질산화율 분석 및 개선 방안

  • Im, Jiyeol (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Gil, Kyungik (Department of Civil Engineering, Seoul National University of Science and Technology)
  • 임지열 (서울과학기술대학교 건설시스템공학과) ;
  • 길경익 (서울과학기술대학교 건설시스템공학과)
  • Received : 2017.03.14
  • Accepted : 2017.11.09
  • Published : 2017.11.30
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Abstract

The heavy metal such as Nikel (Ni) in industrial wastewater is one of the major reasons of decreasing nitrification efficiency in municipal wastewater treatment plants (MWTPs). In this study, laboratory scale reactors were operated in order to analyse of nitrification efficiency and improvement measures. As a result, nitrification efficiency during high Ni concentration (0.295 mg/L) was about 20%. However nitrification efficiency during low Ni concentration (0.114 mg/L) was over 70%. The changes of the micro-organism activity according to Ni concentration was investigated as being the major reason behind the gap of nitrification efficiency through analysing AUR and SNR. Increasing the HRT in high Ni concentration also increased the nitrification efficiency. Thus, maintenance of microorganisms and increasing the HRT in nitrification reactors suggests that measures taken to treat wastewater is positively correlated with high concentration of heavy metal.

산업하수 내 함유된 고농도 중금속(니켈)은 하수처리장 질산화율 감소의 원인으로 지목되고 있다. 본 연구에서는 고농도 니켈을 함유한 산업하수의 질산화율 분석 및 개선 방안을 도출하고자 실험실 규모 반응조 운전을 실시하였다. 운전 결과를 고농도 니켈을 함유한 경우 질산화율은 20% 내외로 낮은 범위를 보였지만, 저농도 니켈이 유입되었을 경우 질산화율이 향상(70% 이상)되었다. 질산화율의 차이를 보인 주요 원인은 니켈이 반응조 내 미생물의 활성을 감소시킨 것으로 AUR과 SNR 분석을 통해 나타났다. 또한 고농도 니켈이 유입될 경우, 체류시간 증가와 더불어 질산화율이 증가하였다. 즉, 고농도 중금속(니켈)을 함유한 하수의 경우 미생물 관리 및 체류시간 증가를 통해 안정적인 질산화율을 확보할 수 있을 것으로 판단된다.

Keywords

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