Bacterial desorption in water-saturated porous media in the presence of rhamnolipid biosurfactant

Research in Microbiology
Gang ChenHonglong Zhu

Abstract

We investigated the effects of transients in elution chemistry on bacterial desorption in water-saturated porous media. Two typical Gram-positive bacterial strains of Lactobacillus casei and Streptococcus mitis were used as the model bacteria in this research. These two strains were first deposited in the porous medium, after which the medium with deposited bacteria was flushed with rhamnolipid biosurfactant solutions with a step increase in concentrations, and pulse-type bacterial releases were obtained. Bacterial desorption was quantified from bacterial breakthrough curves. It was found that bacterial retention in silica sand corresponded to bacterial interaction free energies with silica sand evaluated at the equilibrium distance, which were calculated based on independently determined bacterial, sediment and solution surface thermodynamic properties. With the increase in rhamnolipid biosurfactant concentrations, interactions between bacteria and silica sand decreased, and consequently less bacteria were retained. The decrease in interactions between bacteria and silica sand with increasing rhamnolipid biosurfactant concentrations was attributed to a decrease in the solution electron acceptor parameter of the Lewis acid/base...Continue Reading

References

Sep 22, 2000·Journal of Colloid and Interface Science·T Missana, A Adell
May 22, 2001·Environmental Microbiology·G Chen, K A Strevett
Sep 11, 2002·Advances in Colloid and Interface Science·P K Sharma, K Hanumantha Rao
Jul 14, 2004·Research in Microbiology·Gang Chen, Honglong Zhu

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Citations

Aug 19, 2018·Biotechnology and Applied Biochemistry·Hamidreza HajfarajollahKambiz Akbari Noghabi
Dec 15, 2017·Biotechnology and Bioengineering·Guansheng LiuZhifeng Liu
Sep 18, 2021·Proceedings of the National Academy of Sciences of the United States of America·Judy Q YangHoward A Stone

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