Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education Xi'an University of Architecture and Technology, Xi'an 710055, China.
Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education Xi'an University of Architecture and Technology, Xi'an 710055, China.
J Environ Sci (China). 2014 Apr 1;26(4):749-56. doi: 10.1016/S1001-0742(13)60482-9.
A series of large pilot constructed wetland (CW) systems were constructed near the confluence of an urban stream to a larger river in Xi'an, a northwestern megacity in China, for treating polluted stream water before it entered the receiving water body. Each CW system is a combination of surface-and subsurface-flow cells with local gravel, sand or slag as substrates and Phragmites australis and Typha orientalis as plants. During a one-year operation with an average surface loading of 0.053 m(3)/(m(2)·day), the overall COD, BOD, NH3-N, total nitrogen (TN) and total phosphorus (TP) removals were 72.7% ± 4.5%, 93.4% ± 2.1%, 54.0% ± 6.3%, 53.9% ± 6.0% and 69.4% ± 4.6%, respectively, which brought about an effective improvement of the river water quality. Surface-flow cells showed better NH3-N removal than their TN removal while subsurface-flow cells showed better TN removal than their NH3-N removal. Using local slag as the substrate, the organic and phosphorus removal could be much improved. Seasonal variation was also found in the removal of all the pollutants and autumn seemed to be the best season for pollutant removal due to the moderate water temperature and well grown plants in the CWs.
在中国西北的特大城市西安，一系列大型的人工湿地（CW）系统被建在城市溪流与较大河流的交汇处，用于在受纳水体之前处理受污染的溪流水。每个 CW 系统都是由表面流和地下流单元组成，使用当地的砾石、沙子或矿渣作为基质，以及芦苇和香蒲作为植物。在一年的运行中，平均表面负荷为 0.053 m³/（m²·天），COD、BOD、NH3-N、总氮（TN）和总磷（TP）的总体去除率分别为 72.7%±4.5%、93.4%±2.1%、54.0%±6.3%、53.9%±6.0%和 69.4%±4.6%，有效改善了河水水质。表面流单元对 NH3-N 的去除效果优于 TN，而地下流单元对 TN 的去除效果优于 NH3-N。使用当地矿渣作为基质，可以显著提高有机物和磷的去除效果。此外，所有污染物的去除均存在季节性变化，秋季由于 CW 中水温适中且植物生长良好，似乎是去除污染物的最佳季节。
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