Birch G F, Fazeli M S, Matthai C
Environmental Geology Group, School of Geosciences, The University of Sydney, NSW, 2006, Australia.
Environ Monit Assess. 2005 Feb;101(1-3):23-38. doi: 10.1007/s10661-005-9126-0.
The efficiency of a Stormwater Infiltration Basin (SIB) to remove contaminants from urban stormwater was assessed in the current investigation. The SIB, installed in an urban suburb in eastern Sydney (Australia), was monitored over seven rainfall events to assess the removal efficiency of the remedial device for total suspended solids (TSS), nutrients (TP, TKN, N(ox), TN), trace metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn), organochlorine pesticides and faecal coliforms (FC) from stormwater. The weighted average concentration (WAC) of TSS in the stormwater effluent from the SIB was reduced by an average of 50%, whereas the WAC of Cu, Pb and Zn were also reduced by an average 68%, 93% and 52%, respectively. However, the WAC of Cr, Fe, Mn and Ni displays either similar concentrations as the stormwater influent (Cr and Mn), or substantially higher concentrations (Fe and Ni), due possibly to leaching of fine-grained zeolite clay particles in the filtration bed. The mean removal efficiency of the SIB for total phosphorus (TP) and total Kjeldahl nitrogen (TKN) was 51% and 65%, respectively. In contrast, the average WAC of oxidisable nitrogen (nitrate and nitrite nitrogen or N(ox) is about 2.5 times greater in the effluent (1.34 +/- 0.69 mg L(-1)) than in the incoming stormwater (0.62 +/- 0.25 mg L(-1)). The WAC of total nitrogen (TN) was similar for stormwater at the in-flow and out-flow points. The SIB was very efficient in removing FC from stormwater; and the WAC of almost 70000 cfu (100 mL)(-1) at inflow was reduced to <2000 cfu (100 Ml)(-1) at the outflow, representing a mean removal efficiency of 96%. Due to the low concentrations of Cd, organochlorine pesticides and PAHs in the stormwater, it was not possible to assess the efficiency of the SIB in removing these contaminants.
在本次调查中，对雨水渗透池（SIB）去除城市雨水中污染物的效率进行了评估。该雨水渗透池安装在悉尼东部（澳大利亚）的一个城市郊区，通过对7次降雨事件进行监测，以评估该修复装置对雨水中总悬浮固体（TSS）、营养物质（总磷、凯氏氮、氧化态氮、总氮）、痕量金属（镉、铬、铜、铁、锰、镍、铅、锌）、有机氯农药和粪大肠菌群（FC）的去除效率。雨水渗透池排放的雨水中TSS的加权平均浓度（WAC）平均降低了50%，而铜、铅和锌的WAC也分别平均降低了68%、93%和52%。然而，铬、铁、锰和镍的WAC与雨水流入浓度相比，要么相似（铬和锰），要么显著更高（铁和镍），这可能是由于滤床中细颗粒沸石粘土颗粒的淋溶所致。雨水渗透池对总磷（TP）和凯氏氮（TKN）的平均去除效率分别为51%和65%。相比之下，排放水中可氧化氮（硝酸盐和亚硝酸盐氮或N(ox)）的平均WAC（1.34±0.69mg L(-1)）约为流入雨水中（0.62±0.25mg L(-1)）的2.5倍。雨水流入和流出点的总氮（TN）WAC相似。雨水渗透池在去除雨水中的粪大肠菌群方面非常有效；流入时近70000 cfu（100 mL）(-1)的WAC在流出时降至<2000 cfu（100 mL）(-1)，平均去除效率为96%。由于雨水中镉、有机氯农药和多环芳烃的浓度较低，无法评估雨水渗透池去除这些污染物的效率。
