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New insights into filamentous sludge bulking: The potential role of extracellular polymeric substances in sludge bulking in the activated sludge process.
Chemosphere ( IF 8.8 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.chemosphere.2020.126012
Wei-Ming Li 1 , Xi-Wen Liao 1 , Jin-Song Guo 1 , Yu-Xin Zhang 2 , You-Peng Chen 1 , Fang Fang 1 , Peng Yan 1
Affiliation  

The control of filamentous sludge bulking has been regarded as an important issue in the activated sludge process due to there is still a lack of understanding of the bulking mechanisms. In this study, changes in the extracellular polymeric substances (EPS) and metabolic profile of bulking sludge based on the proteomics level was investigated to reveal the potential role of EPS in deteriorating sludge floc stability and structure during filamentous bulking. The results showed that the EPS content gradually decreased from 210.23 mg/g volatile suspended solids (VSS) to 131.34 mg/g VSS during sludge bulking. The protein (PN) content of the EPS significantly decreased from 173.33 mg/g VSS to 95.42 mg/g VSS during sludge bulking. However, a gradual increase in polysaccharides (PS) was observed. Bacterial aggregation was hindered by the changes in the EPS and its components. The excessive proliferation of filamentous bacteria had a significant effect on the molecular functions of the extracellular PN and metabolic pathways of the EPS. The proteins associated with the hydrophobic amino acid synthesis decreased, whereas the proteins associated with the hydrophilic amino acid synthesis increased during sludge bulking. Electric repulsion was the key factor affecting the aggregation and flocculation ability of the bacteria during sludge bulking. The changes in the EPS and its components induced by the excessive proliferation of filamentous bacteria resulted in a loose floc structure and poor settling performance during sludge bulking. These findings provide new insights into sludge bulking during the activated sludge process.

中文翻译:

丝状污泥膨胀的新见解:活性污泥过程中细胞外聚合物在污泥膨胀中的潜在作用。

丝状污泥膨胀的控制已被认为是活性污泥工艺中的重要问题,因为仍然缺乏对膨胀机理的了解。在这项研究中,研究了基于蛋白质组学水平的膨化污泥的细胞外聚合物质(EPS)和代谢谱的变化,以揭示EPS在丝状膨化过程中在恶化污泥絮凝物稳定性和结构中的潜在作用。结果表明,污泥膨胀过程中EPS含量从210.23 mg / g挥发性悬浮物(VSS)逐渐降低至131.34 mg / g VSS。在污泥膨胀期间,EPS的蛋白质(PN)含量从173.33 mg / g VSS显着降低至95.42 mg / g VSS。但是,观察到多糖(PS)逐渐增加。EPS及其成分的变化阻碍了细菌的聚集。丝状细菌的过度增殖对细胞外PN的分子功能和EPS的代谢途径有重要影响。在污泥膨胀期间,与疏水性氨基酸合成相关的蛋白质减少,而与亲水性氨基酸合成相关的蛋白质增加。电排斥是影响污泥膨胀过程中细菌聚集和絮凝能力的关键因素。由丝状细菌过度繁殖引起的EPS及其组分的变化导致污泥膨胀期间絮状物结构疏松和沉降性能差。这些发现为活性污泥过程中污泥的膨胀提供了新的见解。
更新日期:2020-01-23
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