[논문]Enhanced biodegradation of hydrocarbons by Pseudomonas aeruginosa-encapsulated alginate/gellan gum microbeads

Park, Hyejoo; Kim, Hyojeon; Kim, Ga-Yeong; Lee, Mi-Young; Kim, Young; Kang, Seoktae

doi:10.1016/j.jhazmat.2020.124752

[해외논문] Enhanced biodegradation of hydrocarbons by Pseudomonas aeruginosa-encapsulated alginate/gellan gum microbeads

Journal of hazardous materials, v.406, 2021년, pp.124752 -

Park, Hyejoo (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) , Kim, Hyojeon (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) , Kim, Ga-Yeong (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) , Lee, Mi-Young (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) , Kim, Young (Department of Environmental Systems Engineering, Korea University Sejong Campus) , Kang, Seoktae (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)

Abstract ▼ AI-Helper

Abstract Pseudomonas aeruginosa-encapsulated alginate/gellan gum microbeads (PAGMs) were prepared at the condition of 10 g/L alginate, 1 g/L gellan gum, and 2.57 mM calcium ions, and investigated for the biodegradation of a diesel-contaminated groundwater. The degradation of diesel with PAGMs reached 71.2% after 10days in the aerobic condition, while that of suspended bacteria was only 32.0% even after 30days. The kinetic analysis showed that PAGMs had more than two-order higher second-order kinetic constant than that of the suspended bacteria. Interestingly, the degradation of diesel was ceased due to the depletion of the dissolved oxygen after 10 day in the PAGM reactor, but the microbial degradation activity was immediately restored after the addition of oxygen to 10.5 mg/L. The change in ATP concentration and the viability of bacteria showed that the microbial activity in PAGMs were maintained (66.4%, and 84.3%, respectively) even after 30days of experiment with PAGMs due to the protective barrier of the microbeads, whereas those of suspended bacteria showed significant decrease to 6.2% and 14.4% of initial value, respectively, due to the direct contact to toxic hydrocarbons. The results suggested that encapsulation of bacterial cells could be used for the enhanced biodegradation of diesel hydrocarbons in aqueous systems. Highlights The alginate/gellan gum mixture provided narrowly sized and hard microbeads. The bacteria-encapsulated microbeads enhanced the biodegradation of diesel hydrocarbons. The supplementation of oxygen was necessary to maintain the biodegradation activity. Graphical Abstract [DISPLAY OMISSION]

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[해외논문] Enhanced biodegradation of hydrocarbons by Pseudomonas aeruginosa-encapsulated alginate/gellan gum microbeads

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[해외논문] Enhanced biodegradation of hydrocarbons by Pseudomonas aeruginosa-encapsulated alginate/gellan gum microbeads

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