에머지 개념을 이용한 정수처리시스템의 생태·경제성 평가

Abstract

The Nakdong River being used as drinking water sources for Pusan metropolitan city has the vulnerability of water management due to the fact that industrial areas are located in the upper Nakdong River. Based on BOD the water quality of the Nakdong River was only level Ⅳ, which can only be used for agricultural usage, or industrial usage after meticulous filtration, precipitation and sterilization. Alternatives for Busan's water source have been studied for long time but its qualitative solution led to conflict between each local governments. This study used emergy analysis method to evaluate ecological-economics of each alternatives quantitatively to help making reasonable decision. The emergy methodology is a system evaluation tool that uses energy as the common currency to compare different resources on a common basis. Emergy transformity of Namgang Dam's raw water is higher than emergy transformity of Nakdong River's raw water due to its high water quality. High emergy transformity means high emergy input. seawater desalination system shows 7.9 times lager emergy input then Nakdong River water treatment system. Most citizens of Busan boil the tap water or use the home filter. The additional cost of boiling the tap water or using the home filter is 8,314 or 104,300 emwon/㎥. To change the weak water source and situations we need to diversify water intake.