Rethinking the relationships between gel like structure and sludge dewaterability based on a binary gel like structure model: Implications for the online sensing of dewaterability.
Rethinking the relationships between gel like structure and sludge dewaterability based on a binary gel like structure model: Implications for the online sensing of dewaterability.
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DOI：
10.1016/j.watres.2023.120971
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发表时间：
2023-12
期刊：
影响因子：
12.8
通讯作者：
Daxin Zhang;Yili Wang;Jingjing Wang;Xiaoyang Fan;Shuting Zhang;Meilin Liu;Luyao Ma
中科院分区：
文献类型：
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作者：
Daxin Zhang;Yili Wang;Jingjing Wang;Xiaoyang Fan;Shuting Zhang;Meilin Liu;Luyao Ma
污泥处理过程的数字化转型需要在线检测脱水能力。这个课题基于宏观剪切流变学已经尝试了很多年。然而，流变行为和脱水性之间的关系仍然不明确，原因尚不清楚。在此，提出了一种二元凝胶状结构模型，包括超絮凝体水平上的相互作用网络和絮凝体水平上的凝胶状结构。采用包括光镊在内的多种先进技术来精确理解二元凝胶状结构，并对这种凝胶状结构、流变行为和脱水性之间的相关机制进行分类。对八个污水处理厂污泥的分析表明，超絮体和絮体水平的二元凝胶状结构与污泥脱水性具有显着关系（p < 0.05）。对污泥粘弹性行为的进一步解构表明，超絮体水平的凝胶状结构主导了污泥的流变行为。此外，对四种典型污泥处理过程中二元凝胶状结构的直接描述强调了絮体水平结构在决定脱水性方面的重要性。总体而言，这项研究表明，剪切流变学可能更倾向于强调超絮凝体水平上的相互作用网络，但掩盖了絮凝体水平的结构，尽管后者很重要。这一观察结果可以为设计稳健的脱水性传感器提供一般指导。
The digital transformation of sludge treatment processes requires online sensing of dewaterability. This topic has been attempted for many years based on macroscopic shear rheology. However, the relationship between rheological behavior and dewaterability remains noncommittal, and the reason is unclear. Herein, a binary gel-like structure model was proposed including the interactions network at the supra-flocs level and the gel-like structure at the flocs level. Multiple advanced techniques including optical tweezers were employed to precisely understand the binary gel-like structure and to classify the correlation mechanism between this gel-like structure, rheological behavior, and dewaterability. The analysis of sludge from eight wastewater treatment plants showed the binary gel-like structures at both supra-flocs and flocs levels have significant relationships with sludge dewaterability (p< 0.05). Further deconstruction of the sludge viscoelastic behavior illustrated that the gel-like structure at the supra-flocs level dominates the rheological behavior of sludge. Moreover, the direct description of the binary gel-like structure in four typical sludge treatment processes highlighted the importance of the flocs level's structure in determining the dewaterability. Overall, this study revealed that shear rheology may prefer to stress the interactions network at the supra-flocs level but mask the flocs level's structure, although the latter is important. This observation may provide a general guideline for the design of robust sensors for dewaterability.