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首页> 外文期刊>Journal of Residuals Science & Technology >Polycyclic Aromatic Hydrocarbon Accumulation in Phragmites australis Grown on Constructed Wetland for Sludge Stabilization
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Polycyclic Aromatic Hydrocarbon Accumulation in Phragmites australis Grown on Constructed Wetland for Sludge Stabilization

机译：人工湿地上生长的芦苇中多环芳烃的积累以稳定污泥

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A pilot-scale constructed wetland was tested for the disposal and stabilization of sludge from a municipal wastewater treatment plant. The accumulation and distribution of sixteen polycyclic aromatic hydrocarbons (PAHs) in the plants of Phragmites australis grown on the wetland receiving the sludge was investigated in comparison with native plants without the sludge to examine the effectiveness using P. australis as PAHs bioaccumulator. The experiment lasted for three years and divided into three phases: year 1 was adjustment phase; year 2 was operational phase; year 3 was natural stabilization phase. Analysis of the distribution of PAHs in native P. australis showed that the sequence of PAHs content in the plants was leaves stems roots at 2583, 2198 and 899 μg/kg (DW), respectively. After two year load and one year natural stabilization, the PAHs content in the loaded sludge declined by 63%; the tested plants in the constructed wetland accumulated much more PAHs than native plants. The bioconcentration factor (BCF) of leaves was slightly higher than that of roots and stem i.e. 3.759, 3.518 and 3.368, respectively. The respective PAHs contents in the roots, stems and leaves of the tested P.australis were 7313, 7002 and 7814 μg/kg (DW), being 8.13, 3.19 and 3.02 times of that in the native one, respectively. The BCF of roots and stems of the low molecular weight (MW) PAHs (2–3 ring PAHs) predominated as 5.02 and 4.93 in all samples from the constructed wetland, while the BCF of middle-MW PAHs (4 ring PAHs) was 3.15 and 2.1, and that of high-MW PAHs (5–6 ring PAHs) was 2.29 and 2.63, respectively. In the leaves, the BCF of low-MW and middle-MW PAHs was 4.03 and 4.17, which was higher than 2.81 of high-WM PAHs. The results demonstrated that this plant can effectively remove PAHs from the sludge discharged to the wetland.
机译：测试了一个试验规模的人工湿地，以处理和稳定市政污水处理厂产生的污泥。与没有污泥的本地植物相比，研究了在生长于接受污泥的湿地上的芦苇植物中十六种多环芳烃（PAHs）的积累和分布，以检验使用P. australis作为PAHs生物蓄积剂的有效性。实验持续了三年，分为三个阶段：第一年是调整阶段;第二年是调整阶段。第二年是运营阶段;第三年是自然稳定阶段。对天然澳大利亚假单胞菌中PAHs分布的分析表明，植物中PAHs含量的顺序分别为叶>茎>根，分别为2583、2198和899μg/ kg（DW）。经过两年负荷和一年自然稳定后，负荷污泥中的PAHs含量下降了63％;在人工湿地中，经过测试的植物积累的PAHs比原生植物多得多。叶片的生物富集系数（BCF）略高于根和茎，分别为3.759、3.518和3.368。被测紫P的根，茎和叶中的PAHs含量分别为7313、7002和7814μg/ kg（DW），分别是天然PHAs的8.13、3.19和3.02倍。在所有人工湿地样本中，低分子量（PA）（2-3个环PAH）的根和茎的BCF分别为5.02和4.93，而中分子量（4个环）的PAH的BCF为3.15。和2.1，高分子量PAH（5-6环PAH）分别为2.29和2.63。在叶片中，低MW和中MW PAH的BCF分别为4.03和4.17，高于高WM PAH的2.81。结果表明，该工厂可以有效地去除排放到湿地的污泥中的PAHs。

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