Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Salt Removal and Agricultural Application of Food Waste-Biochar

음식폐기물바이오차의 염분 제거 및 농업적 활용

  • Sin-Sil Kim (Division of Applied Life Science(BK21 Four) & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Jun-Suk Rho (Division of Applied Life Science(BK21 Four) & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Jae-Hoon Lee (Division of Applied Life Science(BK21 Four) & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Ah-Young Choi (Division of Applied Life Science(BK21 Four) & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Seul-Rin Lee (Division of Applied Life Science(BK21 Four) & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Yu-Jin Park (Division of Applied Life Science(BK21 Four) & Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Jong-Hwan Park (Department of Life Resources Industry, College of Natural Resources and Life Science, Dong-A University) ;
  • Young-Han Lee (Research and Development Bureau, Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Dong-Cheol Seo (Division of Applied Life Science(BK21 Four) & Institute of Agriculture and Life Science, Gyeongsang National University)
  • 김신실 (경상국립대학교 응용생명과학부(BK21 Four) & 농업생명과학연구원) ;
  • 노준석 (경상국립대학교 응용생명과학부(BK21 Four) & 농업생명과학연구원) ;
  • 이재훈 (경상국립대학교 응용생명과학부(BK21 Four) & 농업생명과학연구원) ;
  • 최아영 (경상국립대학교 응용생명과학부(BK21 Four) & 농업생명과학연구원) ;
  • 이슬린 (경상국립대학교 응용생명과학부(BK21 Four) & 농업생명과학연구원) ;
  • 박유진 (경상국립대학교 응용생명과학부(BK21 Four) & 농업생명과학연구원) ;
  • 박종환 (동아대학교 생명자원과학대학 생명자원산업학과) ;
  • 이영한 (경상남도농업기술원 연구개발국 유용곤충연구소) ;
  • 서동철 (경상국립대학교 응용생명과학부(BK21 Four) & 농업생명과학연구원)
  • Received : 2023.06.15
  • Accepted : 2023.06.27
  • Published : 2023.06.30
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Abstract

Food waste (FW) emissions in South Korea amounted to 4.77 million tons in 2021, and continue to increase. Various technologies have been developed to treat FW, with recent research focusing on biochar production through pyrolysis to reduce FW. However, the agricultural application of food waste-biochar (FWBC) is limited by the salt accumulated during pyrolysis. This study investigated salt removal from and the kinetic characteristics of FWBC, and subsequently evaluated its agricultural applications. FW was pyrolyzed at 350℃ for 4 h, and subsequently washed for 0.1, 0.25, 0.5, 0.75, 1, 5, 15, and 30 min to remove salt. FWBC had a salt concentration of 5.75%, which was effectively removed through washing. The salt concentration decreased rapidly at the beginning (1 min) and then slowly decreased, unlike in FW, in which the salt decreased continuously and slowly. The salt removal speed constant (K) was 1.5586 (Stage 1, FWBC) > 0.0445 (Stage 2, FWBC) > 0.0026 (FW). In a lettuce cultivation experiment, higher biomass was achieved using washed FWBC than when using unwashed FWBC and FW, and soil properties were improved. Overall, these findings suggest that although FW reduction using pyrolysis causes a salt accumulation problem, the salt can be effectively removed through washing. The use of washed FWBC can enhance plant growth and soil properties.

Keywords

Acknowledgement

This work was support by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Livestock Industrialization Technology Development Program (121034-3) and Technology Commercialization Support Program (821007-3), funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA).

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