Variations in the microbial community of biofilms under different near-wall hydraulic shear stresses in agricultural irrigation systems. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: Hou, Peng; Wang, Tianzhi; Zhou, Bo; Song, Peng; Zeng, Wenzhi; Muhammad, Tahir; Li, Yunkai
• Is Part Of: Biofouling. Volume 36:Issue 1(2020)
• Page Start: 44
• Page End: 55
• Publication Date: 2020-01-02
• Subjects: Hydraulic shear stress -- biofilm accumulation -- microbial community -- high-throughput sequencing; Marine fouling organisms -- Periodicals; Materials -- Biodeterioration -- Periodicals; Fouling -- Periodicals; Biodegradation -- Periodicals; Environmental Microbiology -- Periodicals; Water Microbiology -- Periodicals; 576.165
• DOI: 10.1080/08927014.2020.1714600
• Languages: English
• ISSNs: 0892-7014

Abstract

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.