Fan Liwei, Hai Reti, Wang Wenxing, Lu Zexiang, Yang Zhiming
Center of Resources and Environment, Beijing University of Chemical Technology, Beijing 100029, China.
J Environ Sci (China). 2008;20(12):1415-22. doi: 10.1016/s1001-0742(08)62542-5.
A subsurface flow wetland (SSFW) was simulated using a commercial computational fluid dynamic (CFD) code. The constructed media was simulated using porous media and the liquid resident time distribution (RTD) in the SSFW was obtained using the particle trajectory model. The effect of wetland configuration and operating conditions on the hydraulic performance of the SSFW were investigated. The results indicated that the hydraulic performance of the SSFW was predominantly affected by the wetland configuration. The hydraulic efficiency of the SSFW with an inlet at the middle edge of the upper media was 0.584 and the best among the SSFWs with an inlet at the top, the middle, and the bottom edge of the upper media. The constructed media affected the hydraulic performance by the ratio (K) of the upper and lower media resistance. The selection of appropriate media resistance in the protection layer can improve the hydraulic efficiency. When the viscous resistance coefficient of the media in the protection layer changed from 2.315 x 10(5) to 1.200 x 10(8), the hydraulic efficiency of the SSFW increased from 0.301 to 0.751. However, the effect of operating conditions on the hydraulic efficiency of the SSFW was slight.
使用商业计算流体动力学（CFD）代码模拟了潜流湿地（SSFW）。使用多孔介质对构建的介质进行模拟，并使用粒子轨迹模型获得SSFW中的液体停留时间分布（RTD）。研究了湿地配置和运行条件对SSFW水力性能的影响。结果表明，SSFW的水力性能主要受湿地配置的影响。上部介质中间边缘处有入口的SSFW的水力效率为0.584，在顶部、中部和底部边缘有入口的SSFW中最佳。构建的介质通过上下介质阻力比（K）影响水力性能。在保护层中选择合适的介质阻力可以提高水力效率。当保护层中介质的粘性阻力系数从2.315×10⁵变为1.200×10⁸时，SSFW的水力效率从0.301提高到0.751。然而，运行条件对SSFW水力效率的影响较小。
