Maine M A, Suñe N, Hadad H, Sánchez G, Bonetto C
Química Analítica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829 (3000), Santa Fe, Argentina.
J Environ Manage. 2009 Jan;90(1):355-63. doi: 10.1016/j.jenvman.2007.10.004. Epub 2008 Feb 20.
A free water surface wetland was built to treat wastewater containing metals (Cr, Ni, Zn) and nutrients from a tool factory in Argentina. Water, sediment and macrophytes were sampled in the inlet and outlet area of the constructed wetland during three years. Three successive phases of vegetation dominance were developed and three different patterns of contaminant retention were observed. During the Eichhornia crassipes dominance, contaminants were retained in the macrophyte biomass; during the E. crassipes+Typha domingensis stage, contaminants were retained in the sediment and in the T. domingensis dominance stage, contaminants were retained in sediment and in the macrophyte biomass. Removal efficiency was not significantly different among the three vegetation stages, except for NH(4)(+) and i-P(diss). Because of its highest tolerance, T. domingensis is the best choice to treat wastewater of high pH and conductivity with heavy metals, a common result from many industrial processes.
在阿根廷，人们建造了一个自由水面湿地来处理一家工具厂排放的含金属（铬、镍、锌）和营养物质的废水。在三年时间里，对人工湿地的进水区和出水区的水、沉积物和大型植物进行了采样。出现了三个连续的植被优势阶段，并观察到三种不同的污染物截留模式。在凤眼莲占优势期间，污染物被截留在大型植物生物量中；在凤眼莲+多明戈香蒲阶段，污染物被截留在沉积物中，而在多明戈香蒲占优势阶段，污染物被截留在沉积物和大型植物生物量中。除铵根离子和溶解性无机磷外，三个植被阶段的去除效率没有显著差异。由于多明戈香蒲具有最高的耐受性，它是处理高pH值、高电导率且含有重金属的废水的最佳选择，这是许多工业过程的常见结果。
