Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden.
Environ Technol. 2023 Apr;44(11):1600-1612. doi: 10.1080/09593330.2021.2008516. Epub 2021 Dec 23.
Synthetic stormwater was tested to determine the ageing effects on dissolved metal concentrations and used in a column experiment to determine efficiency of four different filter materials (milkweed, bark, peat, polypropylene) in removing total and dissolved metals. Synthetic stormwater was created by adding metal salts, oil and collected stormwater sediment to tap water. Two ageing experiments were performed to determine the change of synthetic stormwater quality over time. One experiment lasted for 11 days and another focused on rapid concentration changes one day after preparation. The one-day ageing experiment showed rapid decrease in dissolved concentration of certain metals, specifically Cu. To consider this change, correction coefficients for each metal were developed and used to estimate the average dissolved metal concentration in the synthetic stormwater during the experiment to determine filter treatment efficiency. During the 11-day experiment on metal concentrations, no noticeable quality changes were observed for at least six days after the preparation of synthetic stormwater. Furthermore, a column experiment was run with duplicate filter columns. Inflow and outflow samples were analysed for total and dissolved metals, turbidity, particle size distribution, and pH. High removal of total metal concentrations was noticed in all tested filter media (58-94%). Dissolved metal concentration removal varied among different filter media. In general, columns with bark and peat media were able to treat dissolved metals better than polypropylene and milkweed. The level of treatment of dissolved metals between the different filter media columns were bark > peat > milkweed > polypropylene.
合成雨水被测试以确定其对溶解金属浓度的老化影响，并在柱实验中用于确定四种不同过滤材料（马利筋、树皮、泥炭、聚丙烯）去除总溶解金属的效率。合成雨水是通过向自来水添加金属盐、油和收集的雨水沉积物来制备的。进行了两项老化实验以确定合成雨水质量随时间的变化。一项实验持续了 11 天，另一项实验则集中研究了制备后一天内的快速浓度变化。一天的老化实验表明，某些金属（特别是 Cu）的溶解浓度迅速下降。为了考虑到这种变化，针对每种金属开发了校正系数，并用于估计实验过程中合成雨水中平均溶解金属浓度，以确定过滤处理效率。在 11 天的金属浓度实验中，在制备合成雨水至少六天后，未观察到明显的质量变化。此外，进行了带有重复过滤柱的柱实验。对总溶解金属、浊度、颗粒分布和 pH 的进水和出水样品进行了分析。在所有测试的过滤介质中都观察到总金属浓度的高去除率（58-94%）。溶解金属浓度的去除率在不同的过滤介质之间有所不同。一般来说，含有树皮和泥炭的柱体能够更好地处理溶解金属，而聚丙烯和马利筋则较差。不同过滤介质柱体之间溶解金属处理水平为：树皮>泥炭>马利筋>聚丙烯。
