Coppini Ester, Palli Laura, Antal Alexandra, Del Bubba Massimo, Miceli Elisangela, Fani Renato, Fibbi Donatella
G.I.D.A. SpA, Via Baciacavallo 36, Prato, Italy.
Department of Civil and Environmental Engineering, University of Florence, Via Santa Marta 3, Florence, Italy E-mail:
Water Sci Technol. 2019 Jan;79(1):145-155. doi: 10.2166/wst.2019.030.
In this paper, the design and start-up of a constructed wetland (CW) for the tertiary treatment of landfill leachates is presented. The flux is characterized by high salinity, high concentration of nitrogen (almost completely in the form of nitrate) and a biochemical oxygen demand (BOD)/chemical oxygen demand (COD) ratio close to zero. The CW pilot plant suffered from mechanical and hydraulic malfunctions which led to an uneven growth of plants inside the tanks. Despite this, COD has been reduced in the range of 0-30%, reduced forms of N (ammonia and nitrite) are also oxidized and removed by 50-80% and 20-26% on average. Considering the low number of plants and the loading rate, CW pilot plant allowed to remove more than 16 kg of COD, leading to a specific removal of 10 gCOD/d · m. Moreover, bacterial communities associated to plants were isolated and analyzed in order to evaluate the influence of such communities on phytoremediation. Bulk soil registered the lowest bacterial titers, while plant compartments and rhizospheric soil showed to be more suitable for bacterial colonization. Twenty-five different bacterial genera were observed among the analyzed isolates, with the predominance of Pseudomonas genus.
本文介绍了一种用于垃圾渗滤液三级处理的人工湿地（CW）的设计与启动。该渗滤液的特点是盐度高、氮浓度高（几乎完全以硝酸盐形式存在）以及生化需氧量（BOD）/化学需氧量（COD）比值接近零。该人工湿地中试装置存在机械和水力故障，导致池内植物生长不均。尽管如此，COD的去除率在0 - 30%范围内，还原态氮（氨和亚硝酸盐）也被氧化并平均去除了50 - 80%和20 - 26%。考虑到植物数量少和负荷率，人工湿地中试装置能够去除超过16千克的COD，导致比去除率为10 gCOD/d·m。此外，还对与植物相关的细菌群落进行了分离和分析，以评估这些群落对植物修复的影响。大块土壤中的细菌滴度最低，而植物区室和根际土壤显示更适合细菌定殖。在所分析的分离物中观察到25个不同的细菌属，其中假单胞菌属占主导地位。
