• Title/Summary/Keyword: Volatile solids reduction rate

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Anaerobic Co-digestion of Dairy Manure and Crude Glycerin (젖소분뇨와 Crude Glycerin의 통합혐기소화)

  • Lee, Sae-Min;Lee, Sang-Rak
    • Journal of Animal Environmental Science
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    • v.19 no.2
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    • pp.191-196
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    • 2013
  • In this study, the mixture ratio included 20% (GLY 20), 40% (GLY 40), and 60% (GLY 60) based on VS with the control group (GLY 0) with no crude glycerin added. Maintaining stable pH, GLY 20 and GLY 0 showed the highest total output of biogas (1.24 L/L/d) and methane(0.78 L/L/d) as its volatile solids reduction rate was 53.56%. In case of GLY 40 and GLY 60, their pH was rapidly reduced after seven days of the study, so that their anaerobic digestion was all stopped.In the results of the study, it is desirable to add crude glycerin less than 20%, and it would be necessary to have the future researches on more detailed organic loading rate of each ratio, and analysis on economic feasibility.

Operating Characteristics of Composting Facility during Composting of Food Waste and Co-composting of Food Waste and Sewage Sludge (음식물쓰레기 단독 퇴비화 및 음식물쓰레기와 하수 슬러지의 혼합 퇴비화에 따른 퇴비화시설의 운전특성)

  • 남궁완;이노섭;박준석;인병훈;허준무;박종안
    • Journal of Environmental Health Sciences
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    • v.28 no.5
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    • pp.86-92
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    • 2002
  • This study was performed to assets the operating characteristics of food waste composting and co-composting (food waste + sewage sludge) at a compelling facility. The facility was being operated successfully without being affected by kind of composting feed materials. Partial anaerobic condition was detected during food waste composting and co-com-posting, but these two composting systems were proven to be operated successfully under aerobic condition from the monitoring results of $O_2$, volatile solids reduction rate, temperature, and other parameters. The conductivity and chloride concentrations of compost were gradually increased during two composting periods, but the conductivity and chloride concentrations of co-compelling indicated lower values than those of food waste composting at final point(40 m). As a result, co-composting was turned out to be more desirable than food waste composting, considering salt problem. High correlations ($R^2$= 0.9265 for food waste composting and $R^2$= 0.9685 for co-composting) between CEC and volatile organic matter were found. Quality of composts produced from two composting process satisfied Korean heavy metal standard.