Journal of the Korean Society for Environmental Technology (한국환경기술학회지)

Korean Society for Environmental Technology (한국환경기술학회)
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Microwave Drying Characteristics and Energy Cost Analysis with Mixing Ratios of Food Waste, Waste Plastic and Anthracite Coal

음식물 쓰레기, 폐플라스틱 및 무연탄의 혼합비율에 따른 마이크로파 건조특성 및 에너지 비용 분석

  • Cho, Yong-Jin (Department of Naval Architecture & Ocean Engineering, Dong-Eui University) ;
  • Jung, Byung-Gil (Department of Environmental Engineering, Dong-Eui University)
  • 조용진 (동의대학교 조선해양공학과) ;
  • 정병길 (동의대학교 환경공학과)
  • Published : 2013.06.30
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Abstract

The objective of this study was to evaluate the microwave drying characteristics of mixtures of food waste (50~70%), waste plastic (30~40%) and anthracite (0~10%) with respect to physical and economic factors such as mass, volume reduction, moisture content, drying rate and energy power cost when the wastes were dried at different weight mixing ratio and for different microwave irradiation time. The drying process were carried out in a microwave oven, a standard household appliance with a 2,450 MHz frequency and 700 W of power. Maximum dry rates per unit area on the microwave drying (700 W) of mixtures with food waste, waste plastic and anthracite were 327.93 kg $H_2O/m^2{\cdot}hr$ for the moisture content 29.5% for Fw70-Pw30; 309.60 kg $H_2O/m^2{\cdot}hr$ for the moisture content 32.6% for Fw60-Pw40; 330.67 kg $H_2O/m^2{\cdot}hr$ for the moisture content 34.1% for Fw60-Pw30-Ac10; 292.67 kg $H_2O/m^2{\cdot}hr$ for the moisture content 28.0% for Fw50-Pw40-Ac10; and 334.67 kg $H_2O/m^2{\cdot}hr$ for the moisture content 31.0% for Fw50-Pw30-Ac20. The result clearly indicated that moisture can be effectively and inexpensively removed from the wastes through use of the microwave drying process.

본 연구는 음식물류 폐기물(50~70%), 폐플라스틱(30~40%) 및 무연탄(0~10%)의 혼합물에 대한 마이크로파 건조시 원료의 중량혼합비율 및 마이크로파 조사시간에 따른 중량, 부피감소율, 함수율, 건조속도 및 에너지 비용분석 등 건조특성을 평가하는데 그 목적이 있다. 건조공정은 주파수 2,450 MHz, 조사강도 700 W인 가정용 전자레인지를 사용하였다. 음식물류 폐기물, 폐플라스틱 및 무연탄의 혼합물의 마이크로파 건조시 함수율 변화에 따른 최대 건조속도는 혼합비율 Fw70-Pw30, Fw60-Pw40, Fw60-Pw30-Ac10, Fw50-Pw40-Ac10 및 Fw50-Pw30-Ac20에서 각각 29.5%(327.93 kg $H_2O/m^2{\cdot}hr$), 32.6%(309.60 kg $H_2O/m^2{\cdot}hr$), 34.1%(330.67 kg $H_2O/m^2{\cdot}hr$), 28.0%(292.67 kg $H_2O/m^2{\cdot}hr$), 31.0%(334.67 kg $H_2O/m^2{\cdot}hr$)를 나타내었다. 이러한 결과는 특히 음식물류 폐기물에 함유된 수분이 마이크로파 건조공정에 의해 효과적으로 제거될 수 있음을 보여준다.

Keywords

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