综合固体表面的水友性和孔隙结构特征的定量理论,用于通过超高过压的梯度增加来无相变干燥废水污泥
Boran Wu1, Donghai Yang2, Ningrui Yu3
1State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
Water research
|October 31, 2023
概括
超高压过提供了无相变的污泥干燥方法,大大降低了能源消耗. 这种先进的技术通过操纵孔径大小和水相互作用来实现低含水量,与传统的热干燥不同.
科学领域:
- 环境工程 环境工程
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 热污泥干燥是能源密集型,因为湿度相变的潜在热量.
- 传统的方法难以将污泥含水量降低到60%以下.
- 对节能污泥脱水解决方案的需求至关重要.
研究的目的:
- 研究超高压过作为非相变污泥干燥方法.
- 用这种技术来确定可达到的最低含水量.
- 了解极端压力下水分去除的机制.
主要方法:
- 在用聚化调节过量的污泥上应用超高压过 (5-21 MPa).
- 孔径缩小的分析及其与水膜厚度 (1-10纳米) 的相关性.
- 使用哈根-波西耶方程估计孔水流出,考虑孔水友性和压力.
主要成果:
- 在21 MPa的过压力下,达到最低28.12%的重量级含水量.
- 观察到孔径缩小到纳米尺度,将毛细血管水转化为附近的水.
- 证明了显著的固体水界面相互作用影响水的状态.
- 哈根-波泽尔方程支持连续的水流出,即使有小孔.
结论:
- 超高压过使无相变的污泥干燥成为可能,超越了传统的热方法.
- 这一过程在污泥脱水过程中可节省大量的能源.
- 这些发现挑战了关于污泥水含量减少极限的传统信念.
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