유중증발 건조기술을 이용한 여름 및 겨울철 하수 슬러지 건조특성 연구 (Study on the Characteristics of Evaporative Drying in Immersed Hot Oil for Summer and Winter Sewage Sludge)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 26권 / 1호 / 78 ~ 85페이지
· 저자명 : 엄태인, 채종성, 김정은, 김희겸, 문승현, 임광수

초록

Most of current organic sewage sludge depends on ocean disposal due to government's prohibition of direct disposal, such as landfill, of organic sludge, however in the near future based on London protocol, ocean discharge will be prohibited. Therefore, the local government is facing the problem of finding alternate process of disposing sewage sludge. Commercialized drying technology of sludge is unable to reduce water content of sewage sludge to 30% so in real it is hard to treat heat effectively in incinerators. This study decreases the percentage of water content in sludge from over 80% to under 10% by the technology of evaporative drying in immersed hot oil for sewage sludge (EDIHOS) in heated waste oil container. In this study, the EDIHOS technology with the heat transfer coefficient of approximately 500 w/㎡℃ at maximum was applied in drying sewage sludge. Waste oil was used as an evaporative drying oil, and as the evaporative drying oil's boiling point is about 200 ~ 340℃. At the EDIHOS equipment, when the sludge is input by molding it at a designated form after heating the waste oil at temperature 130 to 160℃ range, the heated oil content rapidly evaporates the water contained in the organic sludge for approximately 10 minutes. The the water content of the dried sludge goes less than 10% and its heating value surpasses 5,300 kcal/kg, which can be used as a solid fuel. The results of sludge drying experiment are as follows; (1) regarding the drying efficiency of the two kinds of sludge, the water content in the sludge from the Summer sludge and the Winter sludge after drying reduced from 78.9% to 6.8%, 83.5% to 1.3% in the sludge; (2) the heat value of the sludge from the Summer sludge and the Winter sludge prior to drying were 567, 634 kcal/kg, respectively, but in increased to 5,977, 6,314 kcal/kg after the drying; and when the dried sludge is used as a solid fuel, it can be collected from the equipment for treating after combustion.

영어초록

Most of current organic sewage sludge depends on ocean disposal due to government's prohibition of direct disposal, such as landfill, of organic sludge, however in the near future based on London protocol, ocean discharge will be prohibited. Therefore, the local government is facing the problem of finding alternate process of disposing sewage sludge. Commercialized drying technology of sludge is unable to reduce water content of sewage sludge to 30% so in real it is hard to treat heat effectively in incinerators. This study decreases the percentage of water content in sludge from over 80% to under 10% by the technology of evaporative drying in immersed hot oil for sewage sludge (EDIHOS) in heated waste oil container. In this study, the EDIHOS technology with the heat transfer coefficient of approximately 500 w/㎡℃ at maximum was applied in drying sewage sludge. Waste oil was used as an evaporative drying oil, and as the evaporative drying oil's boiling point is about 200 ~ 340℃. At the EDIHOS equipment, when the sludge is input by molding it at a designated form after heating the waste oil at temperature 130 to 160℃ range, the heated oil content rapidly evaporates the water contained in the organic sludge for approximately 10 minutes. The the water content of the dried sludge goes less than 10% and its heating value surpasses 5,300 kcal/kg, which can be used as a solid fuel. The results of sludge drying experiment are as follows; (1) regarding the drying efficiency of the two kinds of sludge, the water content in the sludge from the Summer sludge and the Winter sludge after drying reduced from 78.9% to 6.8%, 83.5% to 1.3% in the sludge; (2) the heat value of the sludge from the Summer sludge and the Winter sludge prior to drying were 567, 634 kcal/kg, respectively, but in increased to 5,977, 6,314 kcal/kg after the drying; and when the dried sludge is used as a solid fuel, it can be collected from the equipment for treating after combustion.

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