KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Effects of Aeration on Bio-hydrogen (Bio-H2) Production in the Anaerobic Digestion

혐기성 소화시 aeration이 수소생성에 미치는 영향

  • 이명주 (경희대학교 대학원 환경공학 전공) ;
  • 장현섭 (경희대학교 대학원 환경공학 전공) ;
  • 황선진 (경희대학교 환경응용화학대학 환경공학전공. 환경연구센터) ;
  • 정연구 (국립금오공과대학교 토목환경공학부)
  • Received : 2006.08.18
  • Accepted : 2006.08.19
  • Published : 2006.11.29
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Abstract

This research investigated the effect of aeration pretreatment for anaerobic seed sludge on hydrogen production. Aeration time for anaerobic sludge was maintained at 0, 1, 3, 6, 12, and 24 hours in batch tests. Two continuous anaerobic reactors (aerated and non-aerated) were also operated. All experiments were conducted at $35^{\circ}C$ using mineral salts-glucose (20 g/l) medium. Methane production decreased with the increase in aeration time. Aeration for 6 hours was determined as an optimum from the amount of hydrogen produced. Hydrogen was steadily produced in the continuous reactor seeded with aerated sludge while no methane production was observed. However, small amount of hydrogen was produced in the non-aerated reactor for short period of time from the start even though short HRT (2 days) and low pH (5.5) were maintained.

본 연구에서는 혐기성 소화에서 aeration이 수소생성에 미치는 영향에 대해 살펴보았다. 혐기성 소화슬러지를 0, 1, 3, 6, 12, 24 시간 동안 aeration 실시 후 glucose(20 g/L)를 기질로 이용하여 batch test를 실시하였다. Aeration 시간이 길어질수록 메탄가스가 감소하고, 수소가스가 증가하였으며, 6시간 동안 aeration을 실시한 반응조에서 가장 높은 수소 생성율(570 ml/L)을 나타내었다. 연속운전의 경우 aerated reactor는 메탄가스의 생성 없이 수소가 지속적으로 발생하였으며, non-aerated reactor의 경우 낮은 pH와 짧은 HRT만으로는 메탄 생성균의 활성을 완전히 저해할 수 없었다. 그러나 미생물관점에서의 보다 명확한 규명을 위해 향후 연구가 추가적으로 진행되어야 하며, 현장 적용성을 고려한 aeration 처리의 최적조건 도출도 이루어져야 할 것이다.

Keywords

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