Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Separation Characteristic and Recycling of Excavated Materials Containing Waste

폐기물혼입굴착물의 선별특성과 재활용성 평가

  • Lee, Suyoung (National Institute of Environmental Research, NIER) ;
  • Kim, Kyuyeon (National Institute of Environmental Research, NIER) ;
  • Jeon, Taewan (National Institute of Environmental Research, NIER) ;
  • Shin, Sunkyoung (National Institute of Environmental Research, NIER)
  • 이수영 (국립환경과학원 환경자원연구부) ;
  • 김규연 (국립환경과학원 환경자원연구부) ;
  • 전태완 (국립환경과학원 환경자원연구부) ;
  • 신선경 (국립환경과학원 환경자원연구부)
  • Received : 2019.03.05
  • Accepted : 2019.06.03
  • Published : 2019.06.30
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Abstract

The study is carried out to survey the proper management and to propose an eco - friendly separation system through efficient screening and resource recovery of excavated materials containing waste from various excavating fields such as reconstruction of landfill sites for reuse, reclamation of unsanitary landfill and residential land development of waste dumping sites. The current status and screening process and analytical characteristics of the excavated materials containing waste were reviewed. Through the analysis of the samples such as separated combustibles, recyclable soils and residues collected from the on-site visits we were able to understand the characteristics of separated materials and excavated materials containing waste such as calorific value, elementary composition, TOC, foreign material content and LOI. It has been found that elimination of the moisture of excavations, removal of attached soil from the surfaces of the excavated combustibles and the quantitative supply method of the input devices are the main operating factors as essential factors for the optimal separation of excavated materials containing waste. For efficient management and recycling of excavated materials containing, it is necessary to set criteria of ash content in separated combustibles and criteria organic matter content in separated soils.

과거 산업화와 경제발달 과정에서 증가하였던 폐기물이 일부 단순 투기되거나 비위생 매립시설에 최종 처분된 사례가 있다. 매립지 사용종료 및 신규 매립지 확보를 위해 사용이 종료된 비위생매립지 정비 사업들의 시행과 폐기물의 자원화 정책이 강화되면서 매립억제 및 기매립 자원의 재활용을 위한 매립폐기물의 순환이용과 순환형매립지 조성사업이 확대되고 있다. 폐기물혼입굴착물은 순환형매립지의 조성, 매립지 정비사업 및 각종 건설공사 등 다양한 굴착 현장에서 발생되며 자원의 유효이용과 폐기물의 적정처리를 통한 관리가 필요하다. 본 연구에서는 택지개발, 순환형매립지 정비, 비위생매립지 정비 등 굴착 선별 공사가 진행 중인 사업장 3개소를 대상으로 폐기물혼입굴착물의 선별을 통한 선별가연물, 선별토사의 물리화학적 조성 및 특성분석을 통해 선별회수자원 및 잔재물의 특성을 검토하였다. 그 결과, 굴착 선별된 가연물의 부착토사 및 불연성분으로 인해 소각처리 시 운영효율 저하 혹은 고형연료 제조 시 제품의 품질기준을 충족하지 못할 수 있으므로 선별가연물의 불연물 함량을 관리할 필요가 있다. 선별토사의 경우, 매립된 폐기물의 유기성분이 토사 중에 잔존할 수 있으므로 굴착 선별된 토사류의 적정 재활용을 위해서는 선별토사의 유기물질을 관리하여야 할 것으로 판단되었다.

Keywords

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Fig. 1. Separation of excavated screened combustibles.

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Fig. 2. Distribution chart of excavated screened combustibles.

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Fig. 3. TOC and DOC of excavated screened soil.

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Fig. 4. Foreign materials of excavated screened soil.

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Fig. 5. Heavy metals of excavated screened soil.

Table 1. Landfill Recycling Project and Landfill Development Project(2009)

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Table 2. Status of Excavated Materials Containing Waste

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Table 3. Physicochemical Characteristics of Excavated Screened Combustibles and Soil

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