微模型
脱水
污水污泥
材料科学
毛细管作用
孔隙水压力
絮凝作用
环境科学
化学工程
污水处理
废物管理
岩土工程
多孔性
环境工程
多孔介质
地质学
复合材料
工程类
作者
Qianqian Wang,Jiawei Li,Feng Feng,Caiyan Qu,Chong–Jian Tang,Qingwei Wang,Wenchao Zhang,Yongjian Xu,Zhiwei Lin
出处
期刊:Water Research
[Elsevier]
日期:2024-03-01
卷期号:252: 121191-121191
被引量:1
标识
DOI:10.1016/j.watres.2024.121191
摘要
The solid-liquid separation is an indispensable and primary link in the process of sludge treatment and disposal. The past research was focused primarily on the technique explorations of sludge dewatering and always disregarded the internal pore structure and water migration behavior in sludge. In this work, the real three-dimensional pore structure of sludge was obtained by Nano-CT. Based on this, a pore-scale heterogeneous sludge micromodel was firstly presented, and the water flooding experiment was carried out to visualize the water migration behavior. The results showed that the sludge structure transformed from sheet-like floc to microsphere particles, and then agglomerated into large globular granules during anaerobic ammonia oxidation. And the equivalent pore size increases from 342 μm to 617 μm, improving the sludge dewaterability characterized by capillary suction time (CST). The most significant implication of this work was revealing the critical role of invalid connected pore in sludge dewatering. Such pore was not contributed to fluid flow but the circulating vortex in it even induced energy dissipation, thus deteriorated the sludge dewaterability. This work may be helpful to understand the critical role of pore characteristic in water migration and shed light on the new dewatering techniques from the perspective of regulating sludge structure.
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