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Study on the Attachment of Escherichia coli to Sediment Particles at a Single-Cell Level: The Effect of Particle Size

1, 2,†, 2,†, 1,*, 2,* and 1,3
1
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2
Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
3
Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, Sichuan, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Water 2019, 11(4), 819; https://doi.org/10.3390/w11040819
Received: 1 April 2019 / Revised: 16 April 2019 / Accepted: 16 April 2019 / Published: 19 April 2019
(This article belongs to the Section Water Quality and Ecosystems)
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Abstract

The attachment of bacteria to sediment particles has a significant impact on the level of bacterial contamination in water. In this work, the attachment of Escherichia coli to particles was investigated with emphasis on the effect of particle size. To exclude the impact of other facts, e.g., the irregularity of particles, we used regular spherical glass particles in addition to natural sediment particles. Both types of particles are mainly composed of SiO2 and are similar in density. Through a bacterial tracking method together with microfluidic techniques, the attachment of single Escherichia coli cells on the particles was observed. The results showed that only a small portion of the cells that approach the particles remain attached and that the attachment probability per approach increases with surface area for both sediment and glass particles within the size range (8–62 μm) examined in this study. Therefore, finer sediments with more surface area have a higher E. coli attachment capacity. The attachment probability is higher on sediment particles than on glass microspheres of equivalent size, indicating preferential attachment of E. coli to sediment particles. The partition coefficient of the commonly used linear partition model was calculated based on microscopic measurements and the obtained relation of the partition coefficient with attachment probability and particle size was validated with data from the published literature. View Full-Text
Keywords: E. coli; attachment; sediment; particle size; linear partition model E. coli; attachment; sediment; particle size; linear partition model
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Wu, T.; Zhai, C.; Zhang, J.; Zhu, D.; Zhao, K.; Chen, Y. Study on the Attachment of Escherichia coli to Sediment Particles at a Single-Cell Level: The Effect of Particle Size. Water 2019, 11, 819.

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