유기물자원화 (Journal of the Korea Organic Resources Recycling Association)

  • 제31권2호
  • /
  • Pages.19-38
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  • 2023
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  • 1225-6498(pISSN)
  • /
  • 2508-3015(eISSN)
유기성자원학회 (Korea Organic Resources Recycling Association)
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컴퓨터 시뮬레이션을 이용한 MLE 공법 하수처리장에서 최저 아산화질소 발생 운전 조건 파악

Finding the operation conditions to minimize nitrous oxide emission from MLE configuration wastewater treatment plant using computer simulation program

  • 한지수 (경기대학교 대학원 환경에너지공학과) ;
  • 김민철 (서울물재생시설공단 물재생연구소) ;
  • 이병희 (경기대학교 사회에너지시스템공학과)
  • Jisoo Han (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Mincheol Kim (Water Regeneration Research Center, Seoul Water Recycling Corporation) ;
  • Byonghi Lee (Department of Civil & Energy System Engineering, Kyonggi University)
  • 투고 : 2023.04.14
  • 심사 : 2023.05.09
  • 발행 : 2023.06.30
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초록

하수처리장에서 생물학적 질소 제거를 위한 질산화, 탈질 과정 중 6대 온실가스 중 하나인 아산화질소가 발생한다. 이번 연구에서는 온실가스 발생량을 정량할 수 있는 컴퓨터 시뮬레이션 프로그램인 EQPS를 이용해 합류식 하수를 처리하는 MLE 공법 하수처리장의 내부반송유량, 수온 그리고 유입수의 일차침전지 by-pass %에 따라 아산화질소가 가장 적게 발생하는 운전 조건을 찾았다. 내부반송 유량은 유입 유량의 200 %이고, 생물반응조 수온이 20 ℃이고 일차침전지에서 생물반응조로 by-pass 되는 유입수가 15 %일 때 아산화질소 배출 계수가 가장 적은 조건임을 확인했다. 또한 깊은 수심에서 공기를 주입하는 심층폭기는 상대적으로 적은 공기공급을 필요로 하기 때문에 일반적인 폭기조에 비해 적은량의 아산화질소가 발생함을 확인하였다.

Nitrous oxide, one of the six greenhouse gases from Kyoto protocol, is known to be emitted in biological nitrification and denitrification reactions at wastewater treatment plant. In this study, EQPS which is a computer program that can simulate nitrous oxide gas emission amount at wastewater treatment plants is used. The MLE process which treats wastewater from combined sewer is studied. Operational variables which are MLR, water temperature at reactor and primary clarifier by-pass percentage are changed to define the condition which produces the least amount of nitrous oxide gas. 200 % of MLR, 20 ℃ of water temperature at bioreactor and 15 % of primary clarifier by-pass percentage are shown the least nitrous oxide emission factor. Also, it is found that the deep aeration tank produces less amount of nitrous oxide gas since less air is required to meet oxygen demand in this type of aeration tank.

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