유기물자원화 (Journal of the Korea Organic Resources Recycling Association)

  • 제32권2호
  • /
  • Pages.37-48
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  • 2024
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  • 1225-6498(pISSN)
  • /
  • 2508-3015(eISSN)
유기성자원학회 (Korea Organic Resources Recycling Association)
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시뮬레이터(EQPS)를 이용한 탄소발자국 최소화 운전 방안에 대한 연구

A study to find the operation conditions to minimize carbon footprint using a simulator(EQPS)

  • 한지수 (경기대학교 대학원 환경에너지공학과) ;
  • 이제승 (경기대학교 대학원 환경에너지공학과) ;
  • 이병희 (경기대학교 사회에너지시스템공학과)
  • Jisoo Han (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Jeseung Lee (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Byonghi Lee (Department of Civil & Energy System Engineering, Kyonggi University)
  • 투고 : 2024.04.25
  • 심사 : 2024.06.21
  • 발행 : 2024.06.30
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초록

하수처리장은 공공부문 온실가스 목표 관리제 대상 시설로 탄소 배출량 감축이 시급하다. 하지만 최근 하수도 통계에 의하면 하수처리량에 대한 CO2 배출량은 2020년 대비 3.03 % 감소하였으며 이는 국가 온실가스 감축목표(NDC)를 충족하기에는 상당히 부족한 수치이다. 생물반응조에서 발생하는 직접 배출 온실가스와 하수처리과정에서 이용되는 에너지로 인한 간접배출 온실가스 두 가지를 모두 고려한 총 CFP (Carbon Footprint)를 최소화하는 생물반응조 운전 조건을 찾기 위해 EQPS라는 시뮬레이션 프로그램을 이용하여 연구를 수행하였다. 4-stage BNR 공법 하수처리장 생물반응조 내부반송율을 유입 수량의 100 %로 설정했을 때 총 CFP가 설계 운전 조건 대비 약 10.97 % 감소함을 확인하였다. 또한 대상 처리장의 N2O EF(Emission Factor)를 계산한 결과 0.138~0.199 %로 IPCC에서 제시한 기본값 1.6 %보다 낮은 값임을 파악하였다. 본 연구는 생물반응조 운전 조건 최적화를 통해 하수처리시설의 총 CFP를 최소화하는 방안을 제시하며, N2O 배출 감소를 위한 추가 연구의 필요성을 강조하고 있다.

Wastewater treatment plants (WWTPs) are obligated to reduce carbon emissions as a part of public sector greenhouse gas (GHG) emission reduction targets. However, Sewage Statistics(2022) shows that CO2 emissions per wastewater treatment volumes have decreased by only 3.03 % compared to 2020, which is far from enough to meet the Nationally Determined Contribution (NDC) targets. This study aimed to find operational conditions of biological reactors that minimize total carbon footprint (CFP). Total CFP considers both direct emissions from biological processes and indirect emissions from energy consumption. A study was conducted using a computer simulation program which is called as EQPS for a 4-stage BNR WWTP. The results showed that total CFP was reduced by 10.97% compared to the design condition when the mixed liquor recirculation (MLR) was set to 100 % of the influent flow. The N2O emission factor (EF) of the target WWTP was calculated to be 0.138-0.199 %, which is significantly lower than the IPCC default value of 1.6 %. This study proposes a method to minimize total CFP in WWTPs by optimizing biological reactor operation and emphasizes the need for further research on N2O emission reduction.

키워드

과제정보

본 연구는 환경부의 재원으로 환경산업기술원의 지원을 받은 상하수도 혁신 기술개발 사업의 일환으로 수행되었습니다. (과제번호: 2020002700010)

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