The goal of this study was to evaluate micro-bubble concentration (Cair) in water by air/water ratio (A/W ratio) with a micro-bubble generating pump. The estimation of micro-bubble concentration is based on the balance of inlet/outlet air and water flow rate. On net A/W ratio to be generated micro-bubble, we found that the obtained the Cair are shown as a function of discharge pressure (Pg) of the micro-bubble generating pump. The correlation of the Cair and the Pg(Cair =3.261Pg-1.754) was adequately described by the least square methods with a high correlation coefficient (r = 0.9459) and calculated values fit the experimental data quite well. The Cair was lower than theoretical dissolved air concentration (Caq) calculated by Henry’s law. The Cair for being operated the micro-bubble generating pump was 6.75 – 39.53 mL/L, however, we found that the optimum of the Cair to generate micro-bubble was the range from 10 to 12 mL/L.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 미세기포 발생펌프
  2.2. 흡입공기량/미세기포 발생량 측정
  2.3. 미세기포 발생펌프형 부상분리장치
 3. 결과 및 고찰
  3.1. 가압수 유량에 따른 net A/W ratio
  3.2. 토출압력( Pg
)과 Cair의 상관관계
 4. 결론
 감사의 글
 참고문헌

• 이창한(부산가톨릭대학교 환경행정학과) | Chang-Han Lee (Department of Environmental Administration, Catholic University of Pusan)
• 안갑환(부산가톨릭대학교 환경행정학과) | Kab-Hwan Ahn (Department of Environmental Administration, Catholic University of Pusan) Corresponding author