Department of Municipal Engineering, College of Civil Engineering, Southeast University, Nanjing 210096, China.
Water Sci Technol. 2012;65(3):463-70. doi: 10.2166/wst.2012.876.
A study was performed using a settling column to remove mercury (Hg) from road runoff. The emphasis was placed on the relationship between Hg removal and critical settling velocities, as well as the distribution of total suspended solids (TSS). The impact of rainfall characteristics and temperature on Hg removal was also discussed. Results indicated that Hg removal was significant within the initial 30 min of the settling process. The Hg removal rate increased with the decrease of critical settling velocity, and this trend became gradually significant, which could be used as an important reference for the optimization of sedimentation basin design. Hg removal at different settling times was significantly related to initial distribution of TSS. The impact of rainfall intensity on Hg removal was greater than other parameters of precipitation features, followed by rainfall. In addition, Hg removal was moderately related to temperature. The effect of antecedent dry periods on Hg removal was restricted by rainfall and rainfall intensity.
一项研究使用沉降柱从道路径流中去除汞 (Hg)。重点放在 Hg 去除与临界沉降速度以及总悬浮固体 (TSS) 分布之间的关系上。还讨论了降雨特征和温度对 Hg 去除的影响。结果表明，在沉降过程的最初 30 分钟内，Hg 去除效果显著。Hg 去除率随临界沉降速度的降低而增加，这种趋势变得越来越显著，可作为优化沉淀池设计的重要参考。不同沉降时间的 Hg 去除与 TSS 的初始分布显著相关。降雨强度对 Hg 去除的影响大于降水特征的其他参数，其次是降雨。此外，Hg 去除与温度中度相关。前期干燥期对 Hg 去除的影响受降雨和降雨强度的限制。
