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Biogas Production by Anaerobic Co-digestion of Livestock Manure Slurry with Fruits Pomace

가축분뇨와 과실착즙박의 혼합 혐기소화에 따른 바이오가스 생산

  • 변지은 (상지대학교 생명과학대학) ;
  • 류종원 (상지대학교 생명과학대학)
  • Received : 2019.05.20
  • Accepted : 2019.07.22
  • Published : 2019.09.30

Abstract

This study is conducted to investigate the effects of anaerobic treatments of swine manure slurry alone and combination of livestock manure slurry and fruit pomace on biogas production. Anaerobic co-digestion was evaluated in mesophilic tank reactors for 96 day-incubation period. The organic matter loading of anaerobic digestion was 1 kg of volatile solids(VS) per $1m^3{\cdot}day$. The highest methane production was achieved from the combination of swine manure slury and mandarin pomace(70:30) treatment, whereas the lowest daily and cumulative methane yields was observed in swine manure slurry alone treatment. More than two-fold increase in bio-gas and methane production was obtained by combination of livestock manure slurry and mandarin pomace treatment, compared to the swine manure slurry alone treatment. The co-digestion of livestock manure and fruits pomace has advantages to enhance the production of methane gas, compared to digestion of swine manure slurry alone.

본 연구는 돈분 슬러리 단독 및 돈분과 우분슬러리 혼합, 가축분뇨 슬러리와 과실착즙박(사과착즙박, 감귤착즙박) 혼합 혐기처리가 바이오가스 발생에 미치는 영향을 규명하기 위하여 가동하였다. 6개의 중온소화 반응조를 96일간 가동하였으며, 유기물 부하량은 $1.0kg-VS/m^3{\cdot}day$ 으로 하였다. 과실착즙박이 혼합된 처리구인 돈분 슬러리와 감귤착즙박 혼합 처리구(70 : 30)가 가장 높은 메탄 생산량을 나타내었다. 반면, 돈분슬러리 단독 처리구의 메탄 발생량은 가장 적었다. 돈분, 우분 슬러리와 감귤착즙박 혼합 처리구가 돈분 슬러리 단독 처리구보다 바이오가스와 메탄가스가 2배 이상 많이 발생되었다. 돈분 슬러리와 감귤착즙박 혼합 처리구가 메탄가스 발생량이 많았던 것은 과일착즙 후 발생하는 과일박이 낮은 pH를 나타내어 가축분뇨 내 높은 알칼리도와 적절히 중화될 수 있으며, VS가 돈분슬러리보다 높았기 때문인 것으로 사료된다. 결론적으로 가축분뇨와 과실착즙박 혼합 투입이 돈분 단독 소화 보다 메탄가스 생산을 높이는 장점이 있다.

Keywords

References

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