Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padua, Agripolis Campus, Viale dell'Università 16, 35020, Legnaro, PD, Italy,
Environ Sci Pollut Res Int. 2015 Feb;22(4):2455-66. doi: 10.1007/s11356-014-3247-3. Epub 2014 Jul 10.
This experiment assesses the aptitude of 18 species in treating the digestate liquid fraction (DLF) in a floating wetland treatment system. The pilot system was created in NE Italy in 2010 and consists of a surface-flow system with 180 floating elements (Tech-IA®) vegetated with ten halophytes and eight other wetland species. The species were transplanted in July 2011 in basins filled with different proportions of DLF/water (DLF/w); periodic increasing of the DLF/w ratio was imposed after transplanting, reaching the worst conditions for plants in summer 2012 (highest EC value 7.3 mS cm/L and NH4-N content 225 mg/L). It emerged that only Cynodon dactylon, Typha latifolia, Elytrigia atherica, Halimione portulacoides, Salicornia fruticosa, Artemisia caerulescens, Spartina maritima and Puccinellia palustris were able to survive under the system conditions. Halophytes showed higher dry matter production than other plants. The best root development (up to 40-cm depth) was recorded for Calamagrostis epigejos, Phragmites australis, T. latifolia and Juncus maritimus. The highest nitrogen (10-15 g/m(2)) and phosphorus (1-4 g/m(2)) uptakes were obtained with P. palustris, Iris pseudacorus and Aster tripolium. In conclusion, two halophytes, P. palustris and E. atherica, present the highest potential to be used to treat DLF in floating wetlands.
本实验评估了 18 个物种在浮式湿地处理系统中处理消化液（DLF）的能力。该试验系统于 2010 年在意大利东北部建成，由一个表面流系统组成，有 180 个浮式单元（Tech-IA®），种植了 10 种盐生植物和 8 种其他湿地植物。这些物种于 2011 年 7 月在不同比例的 DLF/水（DLF/w）填充的盆中移植，在移植后逐渐增加 DLF/w 比值，在 2012 年夏季达到植物的最恶劣条件（最高 EC 值 7.3 mS cm/L 和 NH4-N 含量 225 mg/L）。结果表明，只有狗牙根、香蒲、粗喙薹草、滨藜、海蓬子、蓝蓟、互花米草和盐角草能够在系统条件下存活。盐生植物的干物质产量高于其他植物。柳枝稷、芦苇、香蒲和互花米草的根系发育最好（可达 40 厘米深）。盐角草、灯心草和三裂叶豚草的氮（10-15 g/m(2))和磷（1-4 g/m(2))吸收量最高。总之，两种盐生植物盐角草和粗喙薹草在浮式湿地中处理 DLF 的潜力最大。
