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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 955-959Adsorption-Desorption Characteristics of E.coli by...

Adsorption-Desorption Characteristics of E.coli by Quartz Sands of Different Particle Size

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Abstract:

Adsorption-desorption characteristics of E. coli by quartz sands of five different particle size (351、319、217、71、27μm) were studied using batch equilibrium method. The results showed that quartz sands had great adsorption quantity of E. coli. The adsorption ratio could reach above 95%,when the initial microbial concentration was 10⁹cfu/mL. With the decreased of the quartz sand particle size,the adsorption quantity increased,and adsorption reached balance faster. The Pseudo-second-order rate equation is optimal to describe adsorption kinetics of E. coli by quartz sands, and the isothermal adsorption process is suitable to describe using Henry equation. Quartz sands had small desorption ratio of E. coli,the desorption ratio increased as quartz sands particle size increased, the largest desorption ratio was only 3.6%.The desorption dynamic processes and desorption isothermal processes also can be decreased using Pseudo-second-order rate equation and Henry equation respectively. Desorption of E. coli on quartz sands existed obvious hysteresis. It indicated there existed irreversible adsorption between E. coli and quartz sands, which the E. coli adsorbed was hard to desorb. The average particle size of quartz sands have some relevance with the parameters of Henry equation and Pseudo-second-order rate equation. This shows that particle size is one of the important factors that affect the adsorption and desorption.

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Advances in Environmental Technologies III

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Periodical:

Advanced Materials Research (Volumes 955-959)

Pages:

436-444

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.955-959.436

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Online since:

June 2014

Authors:

Zhi Rong Wang, Wei Li Wang, Xiao Yan Zhu, Jing Lan Wang, Zhi Jie Han, Ya Hua

Keywords:

Adsorption, Desorption, E.coli, Quartz Sand

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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