Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Degradation of Microcystin-LR, Taste and Odor, and Natural Organic Matter by UV-LED Based Advanced Oxidation Processes in Synthetic and Natural Water Source

UV-LED기반 고도산화공정을 이용한 수중 마이크로시스틴-LR, 이취미 물질, 자연유기물 분해

  • Yang, Boram (Center for Water Resource Cycle Research, Korea Institute of Science and Technology) ;
  • Park, Jeong-Ann (Center for Water Resource Cycle Research, Korea Institute of Science and Technology) ;
  • Nam, Hye-Lim (Center for Water Resource Cycle Research, Korea Institute of Science and Technology) ;
  • Jung, Sung-Mok (Center for Water Resource Cycle Research, Korea Institute of Science and Technology) ;
  • Choi, Jae-Woo (Center for Water Resource Cycle Research, Korea Institute of Science and Technology) ;
  • Park, Hee-Deung (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Sang-Hyup (Center for Water Resource Cycle Research, Korea Institute of Science and Technology)
  • 양보람 (한국과학기술연구원 물자원순환연구단) ;
  • 박정안 (한국과학기술연구원 물자원순환연구단) ;
  • 남혜림 (한국과학기술연구원 물자원순환연구단) ;
  • 정성목 (한국과학기술연구원 물자원순환연구단) ;
  • 최재우 (한국과학기술연구원 물자원순환연구단) ;
  • 박희등 (고려대학교 건축사회환경공학과) ;
  • 이상협 (한국과학기술연구원 물자원순환연구단)
  • Received : 2017.01.24
  • Accepted : 2017.03.31
  • Published : 2017.05.31
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Abstract

Microcystin-LR (MC-LR) is one of most abundant microcystins, and is derived from blue-green algae bloom. Advanced oxidation processes (AOPs) are effective process when high concentrations of MC-LR are released into a drinking water treatment system from surface water. In particular, UV-based AOPs such as UV, $UV/H_2O_2$, $UV/O_3$ and $UV/TiO_2$ have been studied for the removal of MC-LR. In this study, UV-LED was applied for the degradation of MC-LR because UV lamps have demonstrated some weaknesses, such as frequent replacements; that generate mercury waste and high heat loss. Degradation efficiencies of the MC-LR (initial conc. = $100{\mu}g/L$) were 30% and 95.9% using LED-L (280 nm, $0.024mW/cm^2$) and LED-H (280 nm, $2.18mW/cm^2$), respectively. Aromatic compounds of natural organic matter changed to aliphatic compounds under the LED-H irradiation by LC-OCD analysis. For application to raw water, the Nak-dong River was sampled during summer when blue-green algae were heavy bloom in 2016. The concentration of extracellular and total MC-LR, geosmin and 2-MIB slightly decreased by increasing the LED-L irradiation; however, the removal of MC-LR by UV-LED (${\lambda}=280nm$) was insufficient. Thus, advanced UV-LED technology or the addition of oxidants with UV-LED is required to obtain better degradation efficiency of MC-LR.

호소, 하천 등에 다량의 영양염류의 유입과 수문학적, 지리학적, 생물학적 요소 등으로 인해 남조류가 대량 발생하게 되며 대표적 독성물질인 마이크로시스틴-LR(MC-LR)이 증가한다. MC-LR이 포함된 지표수를 적절하게 처리하기 위하여 정수처리공정에서는 고도산화공정을 적용하고 있다. 다양한 고도산화공정 중 특히 UV, $UV/H_2O_2$, $UV/O_3$, $UV/TiO_2$ 등에 대한 연구는 꾸준히 되어왔다. 기존의 UV램프의 짧은 교체주기, 수은 폐기물 발생, 큰 열 손실 등의 단점을 보완한 UV-LED를 MC-LR제거에 적용하였다. MC-LR 초기농도 $100{\mu}g/L$을 280 nm의 파장인 LED-L ($0.024mW/cm^2$)와 LED-H ($2.18mW/cm^2$)를 이용하여 산화시켰을 때 각각 최대 약 30%, 95.9%의 MC-LR 제거율을 나타냈다. LED-H를 조사 시 자연유기물 변화는 휴믹물질, UVD, SUVA가 감소하는 경향을 보였고 방향족 유기물이 지방족 유기물로 분해되어 저분자 물질이 되었다. $LED-H/H_2O_2$($H_2O_2$: 1, 2, 5, 10 mg/L)산화반응에 의한 MC-LR제거율은 LED-H 단독에 의한 MC-LR 제거율과 유사하였다. 남조류가 발생한 낙동강 원수를 대상으로 LED-L산화를 적용하여 수질분석을 통하여 특성변화를 확인하였다. DOC 및 TOC의 변화는 거의 없었으나 SUVA와 $UV_{254}$의 감소로 인하여 유기물의 분해되었으며 조류유래물질인 용존 및 총 MC-LR, geosmin, 2-MIB농도가 시간이 지남에 따라 서서히 감소하였다.

Keywords

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