Liu Shu-Yuan, Yan Bai-Xing, Wang Li-Xia
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China.
Huan Jing Ke Xue. 2011 Mar;32(3):723-8.
Three minitype subsurface-horizontal flow constructed wetlands planted with Calamagrostis angustifolia and Phragmites australis and filled with soil and slag were used to investigate the N, P and pH for upper layer and underlayer wetland system by intermission operation. Results demonstrated that TN removal rates in the superstratum of Calamagrostis angustifolia and Phragmites australis wetlands were 0.771 g x (m2 x d)(-1), 1.481 g x(m2 x d)(-1) with 10 days of the hydraulic retention, which were 1.15 and 1.31 times higher than that of underlayer wetland systems, respectively. Simultaneity, TP removal rates in the superstratum of Calamagrostis angustifolia and Phragmites australis wetlands were 1.655 g x (m2 x d)(-1), 6.838 g x (m2 x d)(-1), respectively, which were 1.13 and 1.28 times higher than that of underlayer wetland systems, respectively. The purification ability of upper layer in the wetland system was higher than that of underlayer. A regular trend of pH changes and upstanding buffer ability of wetland system were found. The pH values in the upper layer of soil-slag wetlands were smaller than that of underlayer which was contrary to the soil wetland. The break-point of pH curve indicates the termination of NH4(+) -N reaction in constructed wetland.
采用3个种植有小叶章和芦苇、填充土壤和炉渣的小型潜流人工湿地，通过间歇运行，研究湿地系统上层和下层的氮、磷及pH值。结果表明，小叶章和芦苇湿地表层在水力停留时间为10 d时的总氮去除率分别为0.771 g·(m²·d)⁻¹、1.481 g·(m²·d)⁻¹，分别是下层湿地系统的1.15倍和1.31倍。同时，小叶章和芦苇湿地表层的总磷去除率分别为1.655 g·(m²·d)⁻¹、6.838 g·(m²·d)⁻¹，分别是下层湿地系统的1.13倍和1.28倍。湿地系统上层的净化能力高于下层。发现湿地系统pH值变化规律及良好的缓冲能力。土壤-炉渣湿地上层的pH值小于下层，与土壤湿地相反。pH曲线的转折点表明人工湿地中NH₄⁺-N反应的终止。
