Remediation of Sediments using Micro-bubble

Kang, Sang Yul; Kim, Hyoung Jun; Kim, Tschung Il; Park, Hyun Ju; Na, Choon Ki; Han, Moo Young; Kang, Sang Yul; Kim, Hyoung Jun; Kim, Tschung Il; Park, Hyun Ju; Na, Choon Ki; Han, Moo Young

doi:2016.38.8.420

The Korean text of this paper can be translated into multiple languages on the website of http://jksee.or.kr through Google Translator.

J Korean Soc Environ Eng > Volume 38(8); 2016 > Article

Original Paper

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