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. 2020 Jan;36(1):44-55.
doi: 10.1080/08927014.2020.1714600. Epub 2020 Jan 27.

Variations in the Microbial Community of Biofilms Under Different Near-Wall Hydraulic Shear Stresses in Agricultural Irrigation Systems

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Variations in the Microbial Community of Biofilms Under Different Near-Wall Hydraulic Shear Stresses in Agricultural Irrigation Systems

Peng Hou et al. Biofouling. .

Abstract

The hydraulic characteristics along agricultural irrigation pipelines directly affect the local near-wall hydraulic shear stress and biofilm accumulation. However, the variations in the microbial community during the process remain unknown. Based on the Couette-Taylor reactor, a device was developed to accurately control the hydraulic shear stress. The results indicated that the near-wall hydraulic shear stresses showed quadratic correlations with microbial contents (represented by phospholipid fatty acids r > 0.77, p < 0.05), and the maximum values were obtained under the shear stresses of 0.20-0.35 Pa. For two types of treated wastewater, the mutual operational taxonomic units among different shear stress treatments showed good consistency (>185). Their corresponding response in the microbial community was represented by the quantitative correlations between the near-wall hydraulic shear stresses and the polymorphism indices (r > 0.82, p < 0.05). Among the microorganisms, Firmicutes at the phylum level were significantly affected by the shear stress and significantly influenced the biofilm accumulation process.

Keywords: Hydraulic shear stress; biofilm accumulation; high-throughput sequencing; microbial community.

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