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J Korean Soc Environ Eng > Volume 38(8); 2016 > Article
J Korean Soc Environ Eng 2016;38(8): 420-427. doi: https://doi.org/10.4491/KSEE.2016.38.8.420
미세기포를 이용한 퇴적물 정화
강상율1, 김형준1, 김충일2, 박현주2, 나춘기3, 한무영1
1서울대학교 건설환경공학부
2서울대학교 건설환경종합연구소
3목포대학교 환경공학과
Remediation of Sediments using Micro-bubble
Sang Yul Kang1, Hyoung Jun Kim1, Tschung Il Kim2, Hyun Ju Park2, Choon Ki Na3, Moo Young Han1
1Department of Civil and Environmental Engineering, Seoul National University
2Institute of Construction and Environmental Engineering, Seoul National University
3Department of Environmental Engineering, Mokpo National University
Corresponding author  Hyun Ju Park ,Tel: 02-880-4321, Fax: 02-885-7376, Email: narjjis@hanmail.net
Received: January 3, 2016;  Revised: April 29, 2016;  Accepted: July 18, 2016.  Published online: August 31, 2016.
ABSTRACT
This study was conducted on the sediment remediation using micro-bubble to remove fine particles. For this study, characteristics of contamination and release in sediment were analyzed. And then, the characteristics of bubbles on removal efficiency was investigated at various operation conditions. In particle size distribution of the sediment used for the study, the proportion of clay and silt (<0.075 mm) was about 7.7%, sand (0.075~4.75 mm) was about 67.8%, and gravel (≥4.75) was 24.5%. Total nitrogen (TN) and total phosphorus (TP) of the sediment were 2,790~3,260, 261~311 mg/kg respectively. Ignition loss and water content were 4.1~9.6, 32.9~53.2% respectively. In analysis of removal efficiency according to operation conditions of micro-bubble, it was the highest when operation condition is pressure 6 atm, pressurized water ratio 30%, and coagulant dosage 15 ppm. At the time, the sediment’s removal efficiency was 19.9%. Accordingly removal efficiency of TN and TP were 21.4, 22.6% respectively. Finally a research was found that fine particles in sediment were almost removed by micro-bubble, which led to decrease nutrients’ release at about 20.1~64.3% in comparison to sediment including lots of fine particles.
Key Words: Dissolved Air Flotation (DAF), Micro Bubbles, Sediment, Fine Particles, Nutrients
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