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J Korean Soc Environ Eng > Volume 36(12); 2014 > Article
J Korean Soc Environ Eng 2014;36(12): 873-878. doi: https://doi.org/10.4491/KSEE.2014.36.12.873
박테리아 제거를 위한 완속 모래여과에서 탄소나노튜브의 적용성 검토
안희경, 박성직
한경대학교 지역자원시스템공학과
Applicability Assessment of Carbon Nanotube to Slow Sand Filtration for Bacteria Removal
Hee-Kyung An, Seong-Jik Park
Department of Bioresources & Rural systems Engineering, Hankyong National University
Corresponding author  Seong-Jik Park ,Tel: 031-670-5131, Fax: 031-670-5139, Email: parkseongjik@hknu.ac.kr
Received: September 2, 2014;  Revised: December 29, 2014;  Accepted: December 31, 2014.  Published online: December 31, 2014.
ABSTRACT
The applicability of carbon nanotube (CNT) to slow sand filtration for the removal of bacteria was studied using scanning electron microscope and column experiments. The morphology of CNT were investigated using scanning electron microscope and the CNT looked like a skein serving bacteria favorable site for adhesion. Column experiments were performed over a range of CNT filter depth, pH, and ionic strength. Bacteria removal efficiency was found to increase from 44.15% to 99.95% as the CNT filter depth increased from 1 cm to 5 cm, and 3 cm of CNT filter depth was required for significant removal of bacteria. pH increase from 5.5 to 8.5 decreased the bacteria removal efficiency, due to the electrostatic repulsion between bacteria and CNT at higher pH. Bacteria removal efficiency decreased from 97.25% to 70.90% as the ionic strength increased from 0 mM to 50 mM. This study demonstrated that the CNT can be applied to slow sand filtration for treating microbially contaminated water.
Key Words: Carbon Nanotube, Bacteria, Slow Sand Filtration, Filter Depth, pH, Ionic Strength
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