Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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A Study on Environmental and Economic Analysis for Each Treatment of Sewage Sludge(II) - Results of Economic Analysis -

하수슬러지 처리방법별 환경성 및 경제성 분석에 대한 연구(II) - 경제성 분석 중심으로 -

  • Lee, Dongjin (National Institute of Environmental Research, Environmental Resource Research Department) ;
  • Lee, Suyoung (National Institute of Environmental Research, Environmental Resource Research Department) ;
  • Kwon, Younghyun (National Institute of Environmental Research, Environmental Resource Research Department) ;
  • Cho, Yuna (National Institute of Environmental Research, Environmental Resource Research Department) ;
  • Bae, Jisu (National Institute of Environmental Research, Environmental Resource Research Department)
  • 이동진 (국립환경과학원 환경자원연구부) ;
  • 이수영 (국립환경과학원 환경자원연구부) ;
  • 권영현 (국립환경과학원 환경자원연구부) ;
  • 조윤아 (국립환경과학원 환경자원연구부) ;
  • 배지수 (국립환경과학원 환경자원연구부)
  • Received : 2016.05.10
  • Accepted : 2016.06.13
  • Published : 2016.06.30
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Abstract

This study investigated the environmental and economical assessment for sewage sludge treatment options including biogasification, incineration, carbonization, drying, and solidification. Considering B/C ratio for an anaerobic digestion treatment, for $270,000m^3/d$ (over $1,150m^3/day$), B/C was 1, as the moisture content increased to 95 %, B/C was 1 for $100000m^3/d$ (capacity of $400m^3/day$). Anaerobic digestion+solidification was the most economically feasible, then Anaerobic digestion+incineration and anaerobic digestion+drying were the next economically feasible and then anaerobic digestion+carbonization was the least economically feasible. If anaerobic digestion efficiency was improved to 45%, the treatment costs for anaerobic digestion+carbonization, anaerobic digestion+incineration and anaerobic digestion+drying were decreased to 3,000~5,000 won/t and the costs for anaerobic digestion+solidification was decreased to 2,000~3,000 won/t due to increasing of the beneficial cost of the biogas production.

본 연구는 바이오가스화 처리 유 무에 따라 하수슬러지 처리방법별, 즉 소각, 탄화, 건조, 고형화 등에 대한 환경성 및 경제성 분석을 실시하였다. 혐기소화에 대한 B/C분석에 대하여, 하수처리장 시설규모 $270,000m^3/d$ (하수슬러지 처리규모 $1,150m^3/day$)에서 B/C가 1이 되었다. 함수율을 95 %일 경우, B/C 는 하수처리장 규모 $100000m^3/d$ (하수슬러지 처리규모 $400m^3/day$)에서 1이 되었다. 혐기소화 + 고형화가 가장 경제성이 있었으며, 다음으로는 혐기소화 +소각과 혐기소화 + 건조였으며, 혐기소화 + 탄화가 가장 경제성이 약한 것으로 분석되었다. 유기물 분해율을 45 % 까지 증대시킨 경우 혐기소화를 시키지 않는 경우보다 혐기소화를 하여 후처리를 하는 경우가 처리비용이 3,000 - 5,000 원/톤 감소하고, 다만, 고형화로 후처리 하는 경우는 처리비용이 2,000 - 3,000 원/톤 감소하는 것으로 분석되었다.

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