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Liquid-Composting Conditions of By-product Obtained from Degradation of Animal Carcass for Agriculture Recycling

폐가축사체의 농업적 재활용을 위한 가축사체 액상부산물의 액비화 조건 구명

  • Seo, Young-Jin (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Seo, Dong-Cheol (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Kang, Se-Won (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Lee, Sang-Gyu (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Park, Ju-Wang (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Choi, Ik-Won (Department of Bio-Environmental Sciences, Sunchon National University) ;
  • Sung, Hwan-Hoo (National Institute of Animal Science, Rural Development Administration) ;
  • Kang, Seog-Jin (National Institute of Animal Science, Rural Development Administration) ;
  • Cho, Ju-Sik (Department of Bio-Environmental Sciences, Sunchon National University)
  • 서영진 (순천대학교 생물환경학과) ;
  • 서동철 (순천대학교 생물환경학과) ;
  • 강세원 (순천대학교 생물환경학과) ;
  • 이상규 (순천대학교 생물환경학과) ;
  • 박주왕 (순천대학교 생물환경학과) ;
  • 최익원 (순천대학교 생물환경학과) ;
  • 성환후 (농촌진흥청 국립축산과학원) ;
  • 강석진 (농촌진흥청 국립축산과학원) ;
  • 조주식 (순천대학교 생물환경학과)
  • Received : 2013.10.01
  • Accepted : 2013.12.16
  • Published : 2013.12.31

Abstract

BACKGROUND: Globally, concern about emerging infectious diseases of livestock is growing. For the disposal of the animal carcass, it is necessary to recycle the carcass into an agriculturally usable product. The objective of this study was to investigate the composting conditions of liquid by-product obtained from degradation of animal carcass. METHODS AND RESULTS: Optimum conditions of liquid fertilizer were investigated using different microorganisms, pHs, and volumes of microorganisms (Lactobacillus rhamnosus+Pichia deserticola). Based on the results from the optimum conditions, compost maturity and quality of liquid fertilizer were evaluated for 112 days. The compost maturity of liquid fertilizer were higher in the order of LP(Lactobacillus rhamnosus + Pichia deserticola) > BC(Bacillus cereus) > BS(Bacillus subtilis). The optimum condition under different volumes of LP was injection of 0.5 mL/100 mL. The compost maturity under different pHs were higher in the order of pH 7 > $$5{\geq_-}9{\frac{._-}{.}}11$$. The liquid by-product at 56 days after composting was completely decomposed. The concentrations of T-N, T-P and $K_2O$ in liquid fertilizer at 56 days were 0.94, 0.17 and 3.78%, respectively, and the sum of those concentrations was 4.89%. CONCLUSION(S): Liquid fertilizer of by-product using pig carcass was decomposed with optimum conditions(LP, pH 7, injection of 0.5 mL/100 mL) in 56 days after composting, and was suitable for official standard of commercial fertilizer.

가축사체 액상부산물을 이용하여 액비의 최적조건(미생물, pH, 미생물 주입량)을 조사하였고, 이들 최적 조건하에서 112일간 부숙하여 액비의 품질을 평가하였다. 가축사체 액상부산물 액비 부숙시 최적 LP 미생물의 주입량은 0.5 mL/100 mL이었으며, pH는 7 조건에서 각각 50점으로 완숙판정을 받았다. 최적조건하에서 112일 동안 부숙시킨 액비의 부숙도는 부숙 후 28일에 50점을 받아 완숙판정을 받았으며, 부숙기간이 길어짐에 따라 부숙 56일에는 온도가 $60^{\circ}C$를 넘어 최고점인 55점을 받았고, 이후 온도가 조금씩 낮아져 부숙 후 112일에는 실온조건에 이르렀다. 완숙된 가축사체 액상부산물 액비의 품질을 평가해본 결과, 최적조건하에서 부숙시킨 액비의 경우에는 T-N, $P_2O_5$$K_2O$의 함량이 28일에 가장 높았으며, 시간이 경과함에 따라 약간 감소하는 경향이었다. 또한, 유해성분(As, Cd, Cu, Cr, Hg, Ni, Pb 및 Zn)의 함량은 28일, 56일 및 112일 부숙시킨 액비에서 모두 비료공정규격 기준치에 적합하였다. 이상의 결과를 미루어 볼 때 가축사체 액상부산물을 농업적 재활용을 위한 액비화 조건은 pH 7조건에서 LP 미생물을 0.5 mL/100 mL 주입한 경우이다. 하지만 본 연구에서 비교된 가축분뇨 발효액은 공시재료(가축사체)가 상이하여 향후 가축사체를 이용한 액비의 부숙도 기준이 개선되어야 할 것으로 판단된다.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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