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Effects of Animal Waste Addition on Food Waste Compost under Co-composting

  • Lee, Chang Hoon (Soil & Fertilizer division, National Academy of Agricultural Science) ;
  • Kim, Seok-Cheol (Soil & Fertilizer division, National Academy of Agricultural Science) ;
  • Park, Seong-Jin (Soil & Fertilizer division, National Academy of Agricultural Science) ;
  • Kim, Myeong-Sook (Soil & Fertilizer division, National Academy of Agricultural Science) ;
  • Oh, Taek-Keun (Department of biological chemistry, Chungnam national university)
  • Received : 2017.11.15
  • Accepted : 2017.11.16
  • Published : 2017.12.31

Abstract

Food waste has been recognized as a organic sources for composting and many research was conducted to efficiently utilize or treat. This study was to evaluate a feasibility for producing food waste compost under co-composting with mixture of food and animal waste. The mixing ratio of food and animal waste was 35% as main material, which additionally mixed 30% of sawdust for co-composting. Total days of composting experiment were 84 days and each sub samples were collected at every 7 days from starting of composting. Results showed that inner temperature in composting was rapidly increased to $70{\pm}4^{\circ}C$ within 3~5 days depending on mixing animal waste of cattle, pig, and chicken base compared to sole food waste base. Expecially, the CN ratio in the mixture of food and pig water was the highest (16.2) among compost. After finishing composting experiment, maturity was evaluated with solvita and germination test. Maturity index (MI) of the mixture of food and animal waste was ranged between 6~7, but was 3 in sole food waste. Calculated germination index (GI) was at the range of about 100 irrespectively of mixing of food and animal waste. However, NaCl content and heavy metal as Cr, Cu, Ni, Pb, and Zn contents was increased in the mixture of food and animal waste. which was the highest in compost mixed the food and pig waste. Both MI and GI showed that manufactured fertilizer was suitable for fertilizer criteria while sole food waste was not adequate for composting due to composting periods. Overall, mixing the food and animal waste can be utilized for improving compost maturity, but more research should be conducted to make high quality of food waste compost with animal waste in agricultural fields.

Acknowledgement

Supported by : National Institute of Agricultural Science

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