In order to design the improvement process for T-N removal, the treatment process of Suyoung, Gangbyeon, and Noxan sewage treatment plants (STP) in Busan was anlayzed. Suyoung STP shows a T-N removal efficiency of about 69.8% with MLE(Modified Ludzack ettinger) and A2O+MBR. However, it is necessary to improve the process to maintain over DO of 1 mg/L and is required to install a flow control tank to minimize the rainfall effect. Gangbyun STP shows a about 70.2% T-N removal efficiency with A2O+GFF(gravity fiber filtration). However, in order to improve T-N removal efficiency, it is needed to install MLE process to treat recycle water. Noksan STP shows a T-N removal efficiency of about 71.0% with MLE+Chemical treatment and shows stable T-N concentration in effluent. However, it is required a toxic chemical management process because bad wastewater flows into the STP, also is necessary a process improvement in order to increase internal recycling ratio. Especially, it is required a process improvement to increase HRT of nitrification tank because Suyoung and Gangbyeon STPs shows low nitrification efficiency during winter season.

Abstract
 1. 서 론
 2. 연구 방법
  2.1. 표본 사업장의 공정 선택
  2.2. 표본 사업장의 총괄처리효율 대비표 작성
  2.3. 표본 사업장의 C/N비 및 방류수 TN 측정 자료의비교
  2.4. 강우량의 영향 고찰을 위한 유입유량 측정 자료분석
 3. 결과 및 고찰
  3.1. 표본 처리장의 총괄 처리효율
  3.2. 표본 처리장의 유입수량과 강우량
  3.3. T-N 제거효율
  3.4. 동절기의 T-N제거효율
  3.5. 운전조건 개선 방안
 4. 결 론
 감사의 글
 REFERENCES

• 신춘환(동서대학교 에너지환경공학과, Department of Energy & Environmental Engineering, Dongseo University) | Choon Hwan Shin Corresponding author