气泡大小对综合废水处理系统通风期间氧气转移的影响
Qiaorui Si1, Wentao Sun1, Zhi Zheng2
1Research Center of Fluid Machinery Engineering & Technology, Jiangsu University, Zhenjiang, 212013, China.
Journal of environmental management
|October 14, 2025
概括
优化废水通风中的气泡大小是关键. 一个2毫米的初始气泡直径提高氧气转移和有氧水箱的均性,提高能源效率.
科学领域:
- 环境工程 环境工程
- 流体动力学 流体动力学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 空气化是综合废水处理系统 (IWTS) 中耗能最多的过程.
- 初始气泡直径对通风效率的影响尚不清楚.
研究的目的:
- 为了研究初始气泡直径 (d0) 对有氧坦克中氧气传递效率的定量影响.
- 为了确定在小规模的IWTS中增强通风的最佳气泡大小.
主要方法:
- 计算流体动力学 (CFD) 与人口平衡模型 (PBM) 相结合.
- 整合氧气转移模型来预测气泡直径效应.
- 分析溶解氧 (DO) 分布率和氧气转移率 (kLa).
主要成果:
- 溶解氧的分布在很大程度上取决于最初的气泡直径 (d0).
- 一个2毫米的初始气泡直径导致了高的氧气转移速率 (kLa = 6 × 10^-3 s^-1).
- 一个2毫米的气泡直径显著改善了DO分布的垂直均性.
结论:
- 最初的气泡直径是影响氧气转移系数 (kL) 的主要因素.
- 对于小规模的IWTS (深度≤1米) 建议初始气泡直径为2毫米,以获得最佳的通风设计.
- 这种泡大小平衡了氧气传输效率与均的DO分布.
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