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Effect of ZnO and TiO2 Nanopaticles (NPs) on Microorganisms Growth in Activated Sludge
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 Title & Authors
Effect of ZnO and TiO2 Nanopaticles (NPs) on Microorganisms Growth in Activated Sludge
Ha, Min Jeong; Lee, Yeo Eun; Jang, Am;
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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 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 . It was assumed that, therefore, toxicity of ZnO was found to be greater than .
Activated Sludge;Growth Rate of Microorganisms;ZnO Nanoparticles; Nanoparticles;
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천연유기물을 포함한 산화아연 나노입자 분산배지의 생태독성평가 적용성 연구,박선영;김경태;신유진;김지은;이재우;조은혜;성화경;김필제;최경희;엄익춘;

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