Journal of Marine Bioscience and Biotechnology (한국해양바이오학회지)

The Korean Society for Marine Biotechnology (한국해양바이오학회)
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Improving Microalgal Biomass Productivity and Preventing Biofouling in Floating Marine Photobioreactors via Sulfonation of Selectively Permeable Membranes

부유형 해양 광생물반응기의 선택적 투과막의 술폰화 반응을 통한 Biofouling 억제 및 미세조류 생산성 향상

  • Kim, Kwangmin (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University) ;
  • Lee, Yunwoo (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University) ;
  • Kim, Z-Hun (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University) ;
  • Park, Hanwool (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University) ;
  • Jung, Injae (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University) ;
  • Park, Jaehoon (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University) ;
  • Lim, Sang-Min (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University) ;
  • Lee, Choul-Gyun (National Marine Bioenergy Research Consortium & Department of Biological Engineering, Inha University)
  • 김광민 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과) ;
  • 이윤우 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과) ;
  • 김지훈 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과) ;
  • 박한울 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과) ;
  • 정인재 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과) ;
  • 박재훈 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과) ;
  • 임상민 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과) ;
  • 이철균 (해양바이오에너지 생산기술개발연구센터 & 인하대학교 생물공학과)
  • Received : 2017.05.23
  • Accepted : 2017.06.27
  • Published : 2017.06.30
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Abstract

The purpose of this study was to inhibit biofouling on a selectively permeable membrane (SPM) and increase biomass productivity in marine photobioreactors (PBRs) for microalgal cultivation by chemical treatment. Surfaces of a SPM, composed of polyethylene terephthalate (PET), was sulfonated to decrease hydrophobicity through attaching negatively charged sulfonic groups. Reaction time of sulfonation was varied from 0 min to 60 min. As the reaction time increased, the water contact angle value of SPM surface was decreased from $75.5^{\circ}$ to $44.5^{\circ}$, indicating decrease of surface hydrophobicity. Furthermore, the water permeability of sulfonated SPM was increased from $5.42mL/m^2/s$ to $10.58mL/m^2/s$, which reflects higher nutrients transfer rates through the membranes, due to decreased hydrophobicity. When cultivating Tetraselmis sp. using 100-mL floating PBRs with sulfonated SPMs, biomass productivity was improved by 34% compared with the control group (non-reacted SPMs). In addition, scanning electron microscopic observation of SPMs used for cultivation clearly revealed lower degree of cell attachment on the sulfonated SPMs. These results suggest that sulfornation of a PET SPM could improve microalgal biomass productivity by increasing nutrients transfer rates and inhibiting biofouling by algal cells.

Keywords

References

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