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在集成废水处理系统中,空气对氧气转移特性的影响,利用质量转移模型和计算流体动力学方法
Wentao Sun1, Qiaorui Si1, Zhi Zheng2
1Research Center of Fluid Machinery Engineering & Technology, Jiangsu University, Zhenjiang 212013, PR China.
Bioresource technology
|October 11, 2024
概括
在综合废水处理系统 (IWTS) 中优化通风需要平衡氧气传输的空气流. 计算流体动力学建模表明,对于小规模系统来说,30 L/min是最佳的,有效地提高了氧气传输速率.
科学领域:
- 环境工程 环境工程
- 流体动力学 流体动力学
- 废水处理 废水处理
背景情况:
- 透气对于集成废水处理系统 (IWTS) 中的氧气传输至关重要.
- 了解通风效率是优化溶解氧水平和处理性能的关键.
研究的目的:
- 为了研究IWTS通风中的通风和氧气传输特性.
- 根据氧气传输效率来确定小型IWTS的最佳空气流速.
主要方法:
- 利用计算流体动力学 (CFD) 与人口平衡模型 (PBM) 和氧气转移模型相结合.
- 分析了不同空气流速对氧气转移速率和溶解氧气分布的影响.
- 研究了流强度,氧气质量转移系数 (kL) 和面积单位体积的界面面积之间的关系.
主要成果:
- 增加的空气流速显著提高了氧气传输速率,在更高的速度下,回报率下降.
- 氧气总体质量转移系数主要受体积单位接口面积的影响.
- 流强度和kL之间存在强烈的正相关性,突出了流在氧气转移中的关键作用.
结论:
- 流强度在通风内的氧气转移过程中起着至关重要的作用.
- 30L/分钟的空气流速被确定为小规模IWTS的潜在最佳选择.
- CFD建模为优化通风策略提供了宝贵的见解,以提高废水处理效率.
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