Faculty of Civil & Environmental Engineering, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland E-mail:
Water Sci Technol. 2013;68(5):1164-72. doi: 10.2166/wst.2013.316.
The objective of the study was assessment of occurrence and removal of two groups of persistent organic pollutants: polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in landfill leachate (LL) treated in three constructed wetland systems (CWs) of different construction and flow regime. Two subsurface flow systems (SSF) were analyzed: one with horizontal flow and the second one consisting of two vertical flow beds followed by a horizontal flow bed. The third CW was a surface flow (SF) system, consisting of 10 ponds connected in series. The concentrations of 12 PAHs and 7 PCBs were measured in the samples of LL after subsequent treatment stages and in the sediment samples from the SF system as well as in the substrate samples from the SSF flow systems. It was confirmed that the major mechanism of PCB and PAH removal in CW systems was adsorption to the bottom sediments (in the SF system) or substrate of the beds (in the SSF systems) as well as adsorption to suspended solids, followed by sedimentation. The compounds characterized by higher octanol/water partition coefficient were more effectively retained in the sediments. Also removal of these substances occurred in the earlier stages of treatment.
本研究的目的是评估两组持久性有机污染物（多环芳烃（PAHs）和多氯联苯（PCBs））在三种不同构造和流动方式的人工湿地系统（CWs）中处理垃圾渗滤液（LL）时的出现和去除情况。分析了两个地下流系统（SSF）：一个是水平流，另一个由两个垂直流床组成，然后是一个水平流床。第三个 CW 是一个表面流（SF）系统，由 10 个串联的池塘组成。在随后的处理阶段，测量了 LL 样品中的 12 种 PAHs 和 7 种 PCB 浓度，以及 SF 系统的沉积物样品和 SSF 流动系统的基质样品中的浓度。证实了 CW 系统中 PCB 和 PAH 去除的主要机制是吸附到底部沉积物（在 SF 系统中）或床层的基质（在 SSF 系统中）以及吸附到悬浮固体上，然后沉淀。具有较高辛醇/水分配系数的化合物在沉积物中被更有效地保留。这些物质的去除也发生在处理的早期阶段。
