Statistical analysis technique was applied to operating parameters and removal efficiency data sets obtained from advanced wastewater treatment plant during 1 year. Through factor analysis three factors derived varimax rotation were selected each plant. Three components explained 96%, 87% of the total variance of the process, respectively. The components on A2O plant were identified in the following order：1) Shortening the SRT during high-flow period, 2) Keeping biomass high on winter 3) factor was related to DO. On DNR plant, we defined them as follows: factor 1, Prolonged the SRT during high-flow period; factor 2 was related to sludge return; factor 3, Influent BOD during low-DO period. This technique was believed to assist operators in identifying priorities to improve operation efficiency.

• 문경숙(대구광역시 환경시설공단) | Kyung-Sook Moon
• 민경섭(대구광역시 환경시설공단) | Kyung-Sub Min
• 김승민(대구광역시 환경시설공단) | Seung-Min Kim
• 이찬형(대구광역시 상수도사업본부) | Chan-Hyung Lee Corresponding Author