Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Analysis on effect of heavy metal and Retention time to nitrification using industrial wastewater

중금속과 체류시간이 산업단지하수 질산화에 미치는 영향

  • 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 : 2018.08.14
  • Accepted : 2018.11.06
  • Published : 2018.11.30
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Abstract

The Municipal Wastewater Treatment Plant(MWTP), located industrial estate, has a problem of decreasing nitrification efficiency. In this research, it was analyzed that effect of heavy metals and retention time to nitrification based on operational result of laboratory scale reactors. And suggest improving MWTP operation method for increasing nitrification efficiency based on findings. According to operational result, laboratory scale reactor shows over 60% nitrification efficiency over hydraulic retention time(HRT) 0.5 day. However, the nitrification efficiency of S MWTP(high heavy metal concentration) sample was lower than that of A MWTP(low heavy metal concentration) sample in same operational condition. The main reason was heavy metals in industrial wastewater. This heavy metals was acted as inhibitor to nitrifier in reactors. So, activity of nitrifier was analyzed based on specific nitrification rate(SNR). The SNR of S MWTP sample shows 0.13 ~ 0.21 mg NH4/gMLSS/hr and that of A MWTP sample shows 0.74 mg NH4/gMLSS/hr. As a result, the activity of nitrifier of S MWTP was lower than that of A MWPT. In other words, retrofit methods for improving nitrification efficiency in MWTPs located industrial estate were that to increase retention time in biological treatment process or to pretreat heavy metal before being injected biological treatment process.

산업단지 인근에 위치한 하수처리장은 유입되는 산업폐수 내 중금속으로 인해 질산화 효율이 감소하는 문제점이 있다. 본 연구에서는 실험실 규모 반응조 운전 결과를 바탕으로 산업폐수가 유입되는 하수처리장의 질산화 효율 개선을 위해 중금속과 체류시간이 질산화에 미치는 영향을 분석하였다. 또한 운전 결과를 바탕으로 질산화율 향상을 위한 하수처리장 운전 방법을 제시하고자 한다. 실험실 반응조 운전 결과 체류시간 0.5일 이상으로 운전 할 경우 60% 이상의 질산화율을 확보할 수 있을 것으로 나타났다. 하지만, 동일한 조건에서 일반 도시하수처리장 시료를 이용하는 경우보다 낮은 효율을 보이는 것으로 조사되었다. 이와 같은 결과를 보인 원인으로 산업 폐수 내 함유된 중금속의 영향으로 질산화 미생물의 활성(SNR 기준)을 분석하였다. S 하수처리장과 일반 하수처리장 시료(A MWTPame )를 이용한 반응조의 SNR은 각각 0.13 ~ 0.21 mg NH4/gMLSS/hr과 0.74 mg NH4/gMLSS/hr의 범위를 보였다. 이는 S 하수처리장 시료를 유입수로 하는 반응조 내 미생물의 활성이 낮음을 확인 할 수 있다. 따라서 산업폐수가 유입되는 하수처리장에서 질산화 효율개선을 위해 체류시간 증가 및 전처리를 통한 중금속 처리가 필요할 것으로 판단된다.

Keywords

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Fig. 1. Schematic diagram of laboratory scale reactors

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Fig. 2. Operational results of laboratory scale Reactor 1

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Fig. 3. Operational results of laboratory scale Reactor 2

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Fig. 4. Operational results of laboratory scale Reactor 3

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Fig. 5. Comparison of ammonium nitrogen removal efficiency according to change of influent

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Fig. 6. Track study result of laboratory scale reactors

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Fig. 7. Comparison of SNR with various manual for design ofMWTP

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Fig. 8. Ammonium nitrogen removal efficiency according to HRT

Table 1. Characteristics of influent used this research.

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Table 2. Operational conditions of laboratory scale reactors in this research.

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Table 3. Summary of ammonium nitrogen removal efficiency in laboratory scale reactors

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Table 4. SNR in laboratory scale reactors

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