垂直流人工湿地对邻苯二甲酸二甲酯的去除效果研究

Removal Efficiency of Dimethyl Phthalate by Vertical Flow Constructed Wetlands

构建了种植皇竹草(Pennisetum sinese)、象草(Pennisetum purpureum)和无植物的垂直流人工湿地系统,于2014年10月15日~2015年2月7日期间,研究此人工湿地对投加质量比为10 mg/kg的有机污染物邻苯二甲酸二甲酯的去除效果。结果表明,实验初期,无植物人工湿地对邻苯二甲酸二甲酯的去除率最大,其次为种植皇竹草的人工湿地,种植象草的人工湿地的去除率最小。这些垂直流人工湿地对邻苯二甲酸二甲酯的去除率都大于80%,说明垂直流人工湿地对邻苯二甲酸二甲酯的去除效果较好。实验结束时,这些垂直流人工湿地基质中的有机质含量、全氮含量、全磷含量和酶活性都显著高于实验前,人工湿地基质对水中的有机质、氮和磷污染物仍然有很好的截留、吸附作用,尤其对磷和有机质污染物的去除效果更好,基质中酶活性的增强说明这些人工湿地有长期去除水中邻苯二甲酸二甲酯的潜力。

In order to investigate 10 mg/kg concentration of dimethyl phthalate（DMP） removal efficiency in vertical flow constructed wetland（VFCW）. Three vertical flow constructed wetlands（planting Pennisetum sinese system, planting Pennisetum purpureum system and noplant system） were conducted from October 15 of2014 to February 7 of 2015. The results showed that at the beginning of the test the removal efficiency of dimethyl phthalate in noplant system was the highest, followed by planting Pennisetum sinese system, and the last was planting Pennisetum purpureum system.The dimethyl phthalate removal efficiency was excellent in vertical flow constructed wetland and the average removal efficiency of the three systems was over 80%. After the experiment the contents of the organic matter, the total nitrogen and the total phosphorus were increased in substrate, and enzyme activities were significantly higher than those before the experiment. The substrates had good play on adsorption for organic matter, nitrogen and phosphorus, especially for phosphorus and organic matter. The improvement of enzyme activity showed that the system had the potential to removal dimethyl phthalate in the long run.