• Title/Summary/Keyword: 물용출분석

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Maturity Evaluation of Food Waste Compost through Water Extracts Analysis (물용출성분 분석에 의한 음식쓰레기 퇴비의 숙성도 평가)

  • Cheong, Jun-Gyo;Hwang, Eui-Young;Choi, Jung-Young;Namkoong, Wan
    • Journal of the Korea Organic Resources Recycling Association
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    • v.4 no.1
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    • pp.43-51
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    • 1996
  • 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.

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Performance of the Nanjido Composting Facility (난지도 퇴비화시범시설에서의 퇴비화과정 검토)

  • Namkoong, Wan;Kim, Joung-Dae;Park, Joon-Seok
    • Journal of the Korea Organic Resources Recycling Association
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    • v.5 no.2
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    • pp.7-16
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    • 1997
  • The food waste composting facility of 10 ton/d capacity at Nanjido has been operated successfully since July, 1996. This study was performed to investigate the characteristics of food waste quality, and variation of physicochemical characteristics of feed materials during composting. Food waste with 79% moisture content was used as a substrate. Wood chip was used as a bulking agent. Monitoring results based on VS, TOC, C/N ratio and gas composition indicated that the facility was operated normally under aerobic conditions. Conductivity values during food waste composting were increased. A highly positive correlation (r=1.00) existed between VS and TOC.

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Effect of Biodegradable Waste Particle Size on Aerobic Stabilization Reactions in MBT System (생분해성 폐기물 입경이 MBT시스템과 연계된 호기성안정화반응에 미치는 영향)

  • Kwon, Sang-Hagk;Ban, Jong-Sub;Kim, Su-Jin;Phae, Chae-Gun
    • Journal of Korean Society of Environmental Engineers
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    • v.33 no.7
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    • pp.523-529
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    • 2011
  • This study has been performed to examine the influence of the size of particles on the stabilization in the aerobic stabilization equipment connected with MBT system. The biodegradable waste inside the reactor (60% of food waste, 25% of paper waste, 2% of wood waste and 5% of compost) has been charged in same composition. The degree of stabilization was compared and analyzed after charging with adjustment of particle size in 5 mm, 10 mm, 20 mm, 50 mm, 100 mm and state of no separation. The experiment revealed that highest temperature beyond $65^{\circ}C$ was shown in the particle size of less than 50 mm in change of temperature and the highest temperature was about $50^{\circ}C$ in reactor of 100 mm and no separation. The proportionality between generated quantity of $CO_2$ and particle size was not observed, even the highest in generated quantity was shown in over 100 mm. The weight changes based on wet and dry conditions in the reaction process showed the 30% and 46% of reduction in the smallest particle size of 5 mm and it showed the trend of the lower reduction rate at the bigger particle size. The water soluble $COD_{Cr}$ and TOC showed the reduction rate of 60% in reactor of particle size in 100 mm and no separation while the reduction rate comparing to the initial stage of reaction in the reactor of less than 50 mm was 80%. Such result derived the conclusion of acceleration in the decomposing stabilization of biodegradable material due to the decomposing rate of organic substance as the particle size of biodegradable waste gets smaller. It is concluded as necessary to react in adjustment under 50 mm of particle size as much as possible.