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Influences of Bulking Materials on Sustainable Livestock Mortality Composting

부자재 종류가 친환경적 사축퇴비화에 미치는 영향

  • Won, Seung Gun (College of Animal Life Science, Kangwon National University) ;
  • Park, Ji Young (College of Animal Life Science, Kangwon National University) ;
  • Cho, Won Sil (College of Animal Life Science, Kangwon National University) ;
  • Kwag, Jung Hoon (National Institute of Animal Science, RDA) ;
  • Choi, Dong Yoon (National Institute of Animal Science, RDA) ;
  • Ahn, Hee Kwon (College of Agriculture & Life Sciences, Chungnam National University) ;
  • Ra, Chang Six (College of Animal Life Science, Kangwon National University)
  • 원승건 (강원대학교 동물생명과학대학) ;
  • 박지영 (강원대학교 동물생명과학대학) ;
  • 조원실 (강원대학교 동물생명과학대학) ;
  • 곽정훈 (농촌진흥청 국립축산과학원) ;
  • 최동윤 (농촌진흥청 국립축산과학원) ;
  • 안희권 (충남대학교 농업생명과학대학) ;
  • 라창식 (강원대학교 동물생명과학대학)
  • Received : 2013.04.01
  • Accepted : 2013.09.17
  • Published : 2013.10.31

Abstract

To develop a sustainable composting method for livestock mortality, a natural aeration-composting process was designed and the influences of bulking materials on the mortality composting process were studied. Bulking materials (e.g., compost, swine manure, sawdust, and rice husks), easily supplied at the scene of an animal mortality outbreak, were tested in this research. A lab-scale composting system (W34 ${\times}$ L60 ${\times}$ H26 cm) was made using 100 mm styrofoam, and natural aeration was achieved through pipes installed on the bottom of the system. Four treatments were designed (compost, compost + swine feces, sawdust, and rice husks treatment groups) and all experiments were done in triplicates. During composting for 40 days, no leachate was observed in compost and sawdust treatment groups, whereas 18 and 8.2 ml leachate/kg-mortality was emitted from the compost + feces and rice husks treatment groups, respectively. Dimethyl disulfide (DMDS) emission during the composting was very low in all treatment groups, possibly due to the bio-filtering function of the compost cover layer on the pile. The mortality degradability in compost, compost + feces, sawdust, and rice husks groups was 25.3, 25.8, 13.5, and 14.5%, respectively, showing significantly higher levels in compost and compost + feces groups (p<0.05). Also, only the compost + feces group produced enough heat (over $55^{\circ}C$) and lasted for 7 days, indicating that bio-security cannot be guaranteed without feces supplementation.

Keywords

Composting;Leachate;Mortality

Acknowledgement

Supported by : 농림축산식품부

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