Jay Julia G, Tyler-Plog Megan, Brown Sally L, Grothkopp Fritz
J Environ Qual. 2019 Mar;48(2):493-501. doi: 10.2134/jeq2018.07.0283.
A column study was conducted to test the ability of bioretention soil mixtures (BSMs) to remove nutrients, metals, and polyaromatic hydrocarbons (PAHs) from stormwater collected from an urban highway. Infiltration rate, plant growth response, and turbidity of the effluent were also measured. The BSMs were made from a range of types and rates of composts and additional materials such as water treatment residuals, sawdust, and oyster shells. Sand was used as a control. Total N and P in stormwater measured 1.8 ± 1 and 0.08 ± 0.03 mg L. All treatments were a source of these nutrients. Metal concentrations in the stormwater were low, with mean Cu and Zn concentrations of 39.8 ± 19.1 and 173 ± 113 μg L, and Cd and Pb close to detection limits. All treatments absorbed Cu and Zn from stormwater with varying levels of removal efficiency. The three treatments tested removed 84 to 100% of the PAHs from the stormwater. In general, contaminant removal (N, P, and Zn) efficiency was not related to infiltration rate, with a slight decrease in Cu removal efficiency observed with increased infiltration rate ( = 0.32). These results indicate that the BSMs tested were a source of nutrients but were generally effective at removing metals and PAHs from stormwater.
开展了一项柱试验研究，以测试生物滞留土壤混合物（BSM）从城市高速公路收集的雨水中去除营养物质、金属和多环芳烃（PAH）的能力。还测量了入渗率、植物生长响应和出水浊度。BSM由一系列类型和比例的堆肥以及其他材料（如水处理残渣、锯末和牡蛎壳）制成。以沙子作为对照。雨水中的总氮和总磷含量分别为1.8±1和0.08±0.03mg/L。所有处理都是这些营养物质的来源。雨水中的金属浓度较低，铜和锌的平均浓度分别为39.8±19.1和173±113μg/L，镉和铅接近检测限。所有处理都能从雨水中吸收铜和锌，去除效率各不相同。所测试的三种处理从雨水中去除了84%至100%的PAH。总体而言，污染物（氮、磷和锌）去除效率与入渗率无关，随着入渗率增加（r = 0.32），铜去除效率略有下降。这些结果表明，所测试的BSM是营养物质的来源，但通常能有效去除雨水中的金属和PAH。
