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首页> 外文期刊>Journal of Residuals Science & Technology >Phytoremediation of PAHs-contaminated Sludge in a Constructed Wetland
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Phytoremediation of PAHs-contaminated Sludge in a Constructed Wetland

机译：在人工湿地中对多环芳烃污染的污泥进行植物修复

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Wastewater sludge from metropolitan areas has become a source of polycyclic aromatic hydrocarbons (PAHs), and may result in pollution of soils and plants if applied to agricultural areas. It is important to stabilize wastewater sludge before its application to agricultural land. Constructed wetlands (CWs) have been widely applied for stabilization of sludge. In CWs, plants, especially reeds, promote degradation of pollutants in the rhizosphere and are the principal mechanisms for PAH-contaminated sludge phytoremediation. We studied PAH removal in sludge planted with Phragmites australis (common reeds) in onsite experiments over a 3-year period comprising 2 years of sludge application and 1 year of resting. The average PAH content in the feeder sludge was 5.7 mg kg–1 (DW), consisting of approximately 48% low-molecular-weight (2–3 ring) PAHs, 27% middle-molecular-weight (4 ring) PAHs and 25% high-molecular-weight (5–6 ring) PAHs. After 3 years, the average PAH content in stabilized sludge was 2.1 mg kg–1 (DW), which was lower than that of the feeder sludge. Overall, about 66% of low-molecular-weight PAHs (dominant type), 57% of middle-molecular-weight PAHs and 32% of high-molecular-weight PAHs were removed from the stabilized sludge. Additionally, there were spatial variations in PAHs in stabilized sludge, with PAHs being highest in the surface layer (12–14 cm) sludge, lower in the middle layer (6–8 cm) and lowest in the bottom layer (0–2 cm).
机译：大都市地区的废水污泥已成为多环芳烃（PAHs）的来源，如果应用于农业地区，可能会导致土壤和植物的污染。在将废水污泥应用于农业土地之前，必须对其进行稳定处理。人工湿地（CW）已被广泛用于稳定污泥。在化学废物中，植物，尤其是芦苇，促进根际中污染物的降解，并且是污染PAH的污泥植物修复的主要机制。我们在为期3年的现场实验中研究了种植芦苇（普通芦苇）的污泥中PAH的去除情况，包括2年的污泥施用和1年的静息。进料污泥中的PAH平均含量为5.7 mg kg-1（DW），约占48％的低分子量（2-3环）PAH，27％的中等分子量（4环）PAH和25 ％高分子量（5-6环）PAHs。 3年后，稳定污泥中的PAH平均含量为2.1 mg kg-1（DW），低于进料污泥中的PAH含量。总体而言，从稳定污泥中除去了约66％的低分子量PAH（优势型），57％的中分子量PAH和32％的高分子量PAH。此外，稳定污泥中的PAHs存在空间变化，表层污泥（12–14 cm）中的PAHs最高，中间层（6–8 cm）较低，而底层（0–2 cm）最低）。

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