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J Korean Soc Environ Eng > Volume 43(3); 2021 > Article
J Korean Soc Environ Eng 2021;43(3): 146-159. doi: https://doi.org/10.4491/KSEE.2021.43.3.146
섬유볼 여재 상향류 여과시스템에 의한 비점오염처리
이준호1 , 송대식2
1한국교통대학교 건설・환경・도시교통공학부
2자연환경(주)
Upflow Filtration System Using Fiber-Ball Filter Media for the Treatment of Nonpoint Pollution
Junho Lee1 , Daesik Song2
1Division of Civil, Environmental & Urban-Transportation Engineering, Korea National University of Transportation
2Jayeon Environment, Co., Ltd.
Corresponding author  Junho Lee ,Tel: 043-841-5355, Fax: 043-841-5350, Email: jlee@ut.ac.kr
Received: January 26, 2021;  Revised: February 15, 2021;  Accepted: February 23, 2021.  Published online: March 31, 2021.
ABSTRACT
Objectives
The objective of this study is to investigate the performance of the fiber-ball media upflow filtration system for non-point pollutants treatment.
Methods
The additional air backwashing nozzle were installed between upper and lower fliter media cartridge. The effect of feed SS concentration, surface overflow rate, retention time, head loss on the removal efficiency were investigated respectively. Particle size distribution, SEM, and backwashing effect were also analyzed.
Results and Discussion
The operated of upflow filter mean retention time, mean head loss were 1.99 min, 7.2 cm. On condition of SOR 480 m3/m2/day, results indicate that the range of removal efficiency of turbidity and SS were 76.8 ~ 93.21% (mean 88.3%) and 85.4 ~ 97.9% (mean 92.7%), respectively. The effluent turbidity and SS were under 15 NTU, 20 mg/L, respectively.
Conclusions
Since turbidity can be continuously monitored in a filtration non-point pollution treatment system, turbidity can be used as a operation factor in evaluating operating conditions. The particle size the effluent larger than the influent was due to bonding, collision and adsorption between particles in the pores of the filter media. SEM analysis showed that after backwashing, very fine particles in the filter medium were not removed but adhered to the fiber yarn and remained. The average recovery rate of fiber-ball media filtration was 88.7%, which is evaluated as excellent in backwashing.
Key Words: Fiber-Ball Media, Non-Point Pollutant, Up-Flow Filtration, Particle Size Distribution, Backwashing, Recovery Rate of Media
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