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Cohesive strength changes of sewer sediments during and after ultrasonic treatment: The significance of bound extracellular polymeric substance and microbial community

机译：超声治疗期间和后下水沉积物的粘性强度变化：结合细胞外聚合物物质和微生物群落的重要性

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摘要

Sewer flushing is widely used to remove sewer sediment from drainage systems; however, its performance and cleaning efficiency are limited by the cohesive strength of sewer sediment. To address this, ultrasound, as a clean technology, is proposed to reduce the cohesive strength of sewer sediment. This study investigated the variations in the cohesive strength, extracellular polymeric substances (EPSs), and microbial community of sewer sediment with ultrasonic treatment. During ultrasonic conditioning, the degradation process of the cohesive strength followed the first-order kinetic model and was positively related to the degradation of bound-EPSs. Field emission scanning electron microscopy, particle diameter, and three-dimensional excitation emission analyses suggested that ultrasound reduced the cohesive strength by decreasing the bound-EPS concentration, which reduced the particle size of sewer sediment, and by destroying the structure of tryptophan proteins, which impaired the stability of agglomerated particles. Following ultrasonic treatment, the cohesive strength of the treated sediment was reduced to 69.3% of that of the raw sewer sediment after storage for 21 days; this result could be ascribed to the improvements in polysaccharide transport, amino acid transport, and the cell wall biogenesis functions of the microbial community, as indicated by PICRUSt. Furthermore, next-generation sequencing studies suggest that the proportions of Syntrophomonadaceae, Bacteroidetes_vadinHA17, Synergistaceae, and Syntrophaceae, which are associated with anaerobic digestion and methane production in sediment, improved conspicuously after ultrasonic conditioning.
机译：下水道冲洗广泛用于从排水系统中去除下水道沉积物;然而，其性能和清洁效率受到下水道沉积物的凝聚力的限制。为了解决这一点，提出了作为一种清洁技术的超声，以减少下水道沉积物的粘性强度。本研究研究了具有超声处理的粘性强度，细胞外聚合物物质（EPS）和微生物沉积物的微生物群落的变化。在超声波调节期间，粘性强度的降解过程遵循一阶动力学模型，与界限的降解呈正相关。场发射扫描电子显微镜，粒径和三维励磁发射分析表明，通过降低填充沉积物的颗粒尺寸，通过破坏色氨酸蛋白的结构来减少内聚强度的超声波降低粘性强度。损害了凝聚颗粒的稳定性。在超声波处理之后，在储存21天后，经处理的沉积物的粘性强度降低至原始下水道沉积物的69.3％;该结果可以归因于微生物群体的多糖转运，氨基酸输送和微生物群落的细胞壁生物发生函数的改善，如屠杀所示。此外，下一代测序研究表明，与沉积物中的厌氧消化和甲烷生产相关，Syntrophomonadaceae，Bacteroidetes_vadinha17，Synergistes_Vadinha17，Synergistaceae和Syntrophaceae的比例，在超声调节后显着改善。

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  • 来源
    《The Science of the Total Environment》 |2020年第25期|138029.1-138029.12|共12页
  • 作者

    Daizong Meng; Wei Jin; Keli Chen; Chen Zhang; Yingjie Zhu; Huaizheng Li;

  • 作者单位

    College of Environmental Science and Engineering Tongji University 200092 Shanghai China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University 200092 Shanghai China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China;

    College of Environmental Science and Engineering Tongji University 200092 Shanghai China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University 200092 Shanghai China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China;

    Urban & Rural Construction Design Institute CO LTD 310020 Hangzhou China;

    Shanghai Municipal Engineering Design Institute (Group) Co. Ltd 901 North Zhongshan 2nd Road 200092 China;

    College of Environmental Science and Engineering Tongji University 200092 Shanghai China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University 200092 Shanghai China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China;

    College of Environmental Science and Engineering Tongji University 200092 Shanghai China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University 200092 Shanghai China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China;

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