Maturity Evaluation of Food Waste Compost through Water Extracts Analysis

물용출성분 분석에 의한 음식쓰레기 퇴비의 숙성도 평가

  • Cheong, Jun-Gyo (Institute of Construction Technology, Hyundai Engineering & Construction Co. Ltd.) ;
  • Hwang, Eui-Young (Department of Environmental Industry, Sin-Sung Junior College) ;
  • Choi, Jung-Young (Department of Environmental Industry, Sin-Sung Junior College) ;
  • Namkoong, Wan (Department of Environmental Engineering, College of Engineering, Kon-Kuk University)
  • 정준교 (현대건설기술연구소 환경기술부) ;
  • 황의영 (신성전문대학 환경공업과) ;
  • 최정영 (신성전문대학 환경공업과) ;
  • 남궁완 (건국대학교 공과대학 환경공학과)
  • Published : 1996.03.30

Abstract

Qualititative changes in water extracts during food waste composting were studied in order to identify parameters that can be used as indicaters of compost maturity. Materials used in this study were food wastes, office paper, newspaper and leaves. Three different compositions of food wastes were used : average composition food waste generated in Korea, a high cereal (carbohydrate) content food waste and a high meat (protein) content food waste. Experimental results indicated that parameters which can be used for compost maturity evaluation were water soluble TOC and water soluble $C_{org}/N_{org}$ ratio. In case of water soluble TOC, it is considered as one of the most desirable parameters, since it showed quite distinct decrease pattern than any other parameters. The $C_{org}/N_{org}$ ratio in the water extracts can also be considered as a appropriate index of the compost maturity since this ratio reached a narrow range (5~6) at the end of composting process regardless of initial raw waste compositions. Water soluble TKN was undesirable parameter as a compost maturity index. The ammonia nitrogen content in water extracts varied considerably during composting process, but finally reached a range of 0.067, 0.085% based on dry compost.