Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Application of extracellular polymeric substances (EPSs)-bioflocculant for recovery of microalgae

미세조류 분리/회수를 위한 세포외 고분자물질 생물 응집제 활용

  • Choi, Ohkyung (Department of Environmental system engineering, Korea University) ;
  • Dong, Dandan (Department of Environmental Energy, Sejong University) ;
  • Kim, Jongrack (UnU Inc.) ;
  • Maeng, Sung Kyu (Department of Civil and Environmental Enginnering, Sejong University) ;
  • Kim, Keugtae (Department of Environmental & Energy, Suwon University) ;
  • Lee, Jae Woo (Department of Environmental system engineering, Korea University)
  • 최오경 (고려대학교 환경시스템공학과) ;
  • ;
  • 김종락 (주식회사 유앤유) ;
  • 맹승규 (세종대학교 건설환경공학과) ;
  • 김극태 (수원대학교 환경에너지공학과) ;
  • 이재우 (고려대학교 환경시스템공학과)
  • Received : 2020.12.15
  • Accepted : 2020.12.28
  • Published : 2021.02.15
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Abstract

Microalgae are primary producers of aquatic ecosystems, securing biodiversity and health of the ecosystem and contributing to reducing the impact of climate change through carbon dioxide fixation. Also, they are useful biomass that can be used as biological resources for producing valuable industrial products. However, harvesting process, which is the separation of microalgal biomass from mixed liquor, is an important bottleneck in use of valorization of microalgae as a bioresource accounting for 20 to 30% of the total production cost. This study investigates the applicability of sewage sludge-derived extracellular polymeric substance (EPS) as bioflucculant for harvesting microalgae. We compared the flocculation characteristics of microalgae using EPSs extracted from sewage sludge by three methods. The flocculation efficiency of microalgae is closely related to the carbohydrate and protein concentrations of EPS. Heat-extracted EPS contains the highest carbohydrate and protein concentrations and can be a best-suited bioflocculant for microalgae recovery with 87.2% flocculation efficiency. Injection of bioflocculant improved the flocculation efficiency of all three different algal strains, Chlorella Vulgaris, Chlamydomonas Asymmetrica, Scenedesmus sp., however the improvement was more significant when it was used for flocculation of Chlamydomonas Asymmetrica with flagella.

Keywords

Acknowledgement

본 결과물은 환경부의 제원으로 한국환경산업기술원의 수생태계 건강성 확보 기술개발사업(2020003030006)의 지원을 받아 연구되었습니다.

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