The Nakdong River being used as drinking water sources for the Busan metropolitan city has the vulnerability of water management due to the fact that industrial areas are located in the upper Nakdong River. This study used emergy analysis method to evaluate ecological-economics of water treatment systems of D water treatment plant (WTP) where located in the downstream of the Nakdong River. The emergy methodology is a system evaluation tool that uses energy as the common currency to compare different resources on a common basis. Emergy yield ratio (EYR) and emergy sustainability index (EmSI) of D WTP were 1.16 and 0.18, respectively. It means not resources and sustainable system but consumer goods and not sustainable system. Ratio of emergy benefit to the purchaser (EBP) shows 2.7 times higher than economic costs. To change the weak water source and situations we need to diversity water intake.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 연구재료
  2.2. 연구방법
 3. 결과 및 고찰
  3.1. 낙동강 원수의 에너지 변환도
  3.2. 낙동강 정수처리시스템의 에너지 시스템 다이어그램
  3.3. 낙동강 정수처리시스템의 에머지 평가표
  3.4. 낙동강 정수처리시스템의 에머지 지표
 4. 결 론
 참 고 문 헌

• 정화숙(부산광역시 상수도사업본부 수질연구소) | Hwa-Sook Jung (Water Quality Institute of Busan)
• 손희종(부산광역시 상수도사업본부 수질연구소) | Hee-Jong Son (Water Quality Institute of Busan) Corresponding author
• 이석모(부경대학교 생태공학과) | Seog-Mo Lee (Pukyung National University, Dept. of Ecological Engineering)
• 손형식(부산대학교 미생물학과) | Hyeng-Sik Son (Busan National University, Dept. of Microbiology)