Improved urban stormwater treatment and pollutant removal pathways in amended wet detention ponds
Improved urban stormwater treatment and pollutant removal pathways in amended wet detention ponds
复制标题
DOI：
10.1080/10934529.2012.673306
复制
发表时间：
2012-01-01
影响因子：
2.1
通讯作者：
Brix, Hans
中科院分区：
文献类型：
--
作者：
Istenic, Darja;Arias, Carlos A.;Brix, Hans
一般来说，在潮湿的蓄水池中，溶解的和胶体结合的污染物从雨水中去除的效果很差。然而，这些部分是最生物可利用的，因此，三个湿滞留池进行了修改，种植砂过滤器，吸附过滤器和添加沉淀化学品，以提高溶解的污染物和污染物与细颗粒和胶体的去除。这三个系统处理来自工业、住宅和混合（住宅和公路）集水区的径流，永久水量分别为1，990、6，900和2，680立方米。总悬浮物（TSS），总氮（Tot-N），总磷（Tot-P），PO 4-P，铅，锌，镉，镍，铬，铜，汞的池塘的处理性能消除的范围内通常报道的湿滞留池，但大多数污染物的浓度有效地降低种植砂过滤器在出口。吸附过滤器有助于进一步降低PO 4-P的浓度从0.04 +/- 0.05至0.01 +/- 0.01 mg L-1，也有效地去除重金属。硫酸铁的剂量，以丰富的底部沉积物与铁和剂量的铝盐的进水导致浮游植物的生长较少，但处理性能没有显着影响。重金属（Pb、Zn、Cd、Ni、Cr和Cu）在池塘沉积物中积累。Zn、Ni、Cu、Pb在湿地植物根系中的含量与沉积物中的含量基本相关。在所调查的13种植物中，水酸模（Rumex hydrolapathum）根系对重金属的富集系数最高（Zn和Ni的富集系数分别为4.5和5.9），黄菖蒲（Iris pseudacorus）根系对重金属的富集系数最低（CF < 1）。重金属从植物根系向地上部的转运量较低。因此，重金属从富金属沉积物通过植物吸收和转运到周围生态系统的潜在转移是可以忽略的。
Dissolved and colloidal bound pollutants are generally poorly removed from stormwater in wet detention ponds. These fractions are, however, the most bio-available, and therefore three wet detention ponds were amended with planted sand filters, sorption filters and addition of precipitation chemicals to enhance the removal of dissolved pollutants and pollutants associated with fine particles and colloids. The three systems treated runoff from industrial, residential and combined (residential and highway) catchments and had permanent volumes of 1,990, 6,900 and 2,680 m(3), respectively. The treatment performance of the ponds for elimination of total suspended solids (TSS), total nitrogen (Tot-N), total phosphorous (Tot-P), PO4-P, Pb, Zn, Cd, Ni, Cr, Cu, Hg were within the range typically reported for wet detention ponds, but the concentrations of most of the pollutants were efficiently reduced by the planted sand filters at the outlets. The sorption filters contributed to further decrease the concentration of PO4-P from 0.04 +/- 0.05 to 0.01 +/- 0.01 mg L-1 and were also efficient in removing heavy metals. Dosing of iron sulphate to enrich the bottom sediment with iron and dosing of aluminium salts to the inlet water resulted in less growth of phytoplankton, but treatment performance was not significantly affected. Heavy metals (Pb, Zn, Cd, Ni, Cr and Cu) accumulated in the sediment of the ponds. The concentrations of Zn, Ni, Cu and Pb in the roots of the wetland plants were generally correlated to the concentrations in the sediments. Among 13 plant species investigated, Rumex hydrolapathum accumulated the highest concentrations of heavy metals in the roots (Concentration Factor (CF) of 4.5 and 5.9 for Zn and Ni, respectively) and Iris pseudacorus the lowest (CF < 1). The translocation of heavy metals from roots to the aboveground tissues of plants was low. Therefore the potential transfer of heavy metals from the metal-enriched sediment to the surrounding ecosystem via plant uptake and translocation is negligible.