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J Korean Soc Environ Eng > Volume 38(4); 2016 > Article
J Korean Soc Environ Eng 2016;38(4): 177-183. doi: https://doi.org/10.4491/KSEE.2016.38.4.177
활성슬러지에서의 미생물 성장에 대한 ZnO와 TiO2 나노물질의 영향
하민정, 이여은, 장암
성균관대학교 수자원전문대학원
Effect of ZnO and TiO2 Nanopaticles (NPs) on Microorganisms Growth in Activated Sludge
Min Jeong Ha, Yeo Eun Lee, Am Jang
Graduate School of Water Resources, Sungkyunkwan University
Corresponding author  Am Jang ,Tel: 031-290-7535 , Fax: 031-290-7549, Email: amjang@skku.edu
Received: February 26, 2016;  Revised: March 3, 2016;  Accepted: March 9, 2016.  Published online: April 30, 2016.
ABSTRACT
Sewage treatment using microorganisms is affected by multiple factors such as microbial properties, characteristics of sewage and operating conditions, and nanoparticles inflow may cause negative effects on sewage treatment system especially on the system stability and efficiency. It was studied to assess the toxic effects of nanoparticles on microorganism growth. The activated sludge in the sewage treatment plant of university was cultured in the optimized medium for each strain. Bacillus (gram-positive), Pseudomonas and E.coli (gram-negative) in the activated sludge were selected as target microorganisms, and ZnO and TiO2 were chosen as nanoparticles. For same concentration of nanoparticles, average growth inhibition rate of Bacillus was 60% or more, while that of Pseudomonas was less than 10%. The toxicity of nanoparticles was shown to be higher for gram-positive bacteria than gram-negative bacteria because of their differences on structure of cell wall, components of cell wall protein, physiology of cells and metabolism. ZnO affected 3 times more negative on the growth of microorganisms as compared to TiO2. It was assumed that, therefore, toxicity of ZnO was found to be greater than TiO2.
Key Words: Activated Sludge, Growth Rate of Microorganisms, ZnO Nanoparticles, TiO2 Nanoparticles
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