生物可利用型多环芳烃（PAHs）在污水污泥和生物炭改良土壤中的实地研究。
A field study of bioavailable polycyclic aromatic hydrocarbons (PAHs) in sewage sludge and biochar amended soils.
机构信息
Department of Environmental Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, 3 Maria Curie-Skłodowska Square, 20-031 Lublin, Poland.
Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
出版信息
J Hazard Mater. 2018 May 5;349:27-34. doi: 10.1016/j.jhazmat.2018.01.045. Epub 2018 Jan 31.
The bioavailable PAHs (freely dissolved concentration, Cfree) were determined in sewage sludge (SL) or sewage sludge and biochar (BC) amended soil. SL or SL with a 2.5, 5 or 10% of BC was applied to the soil. The study was conducted as a long-term field experiment. Addition of BC to SL at a dose of 2.5 and 5% did not affect the content of Cfree PAHs in soils. However a significant difference (by 13%) in Cfree PAHs content was noted in experiment with 10% addition of BC. During the experiment, the concentration of Cfree PAHs in SL- and SL/BC-amended soil decreased. In particular sampling terms the content of Cfree PAHs in SL/BC-amended soil was significantly lower comparing to the Cfree PAHs content in SL-amended soil. After 18 months, Cfree PAH content was significantly lower in SL/BC-amended soil than in the experiment with SL alone, and did not differ significantly from the Σ16 Cfree content in the control soil. The largest decrease relative to the soil with sewage sludge alone was observed for 3-, 5- and 6-ring PAHs. This is the first field-based evidence that biochar soil amendment was effective to reduce of the Cfree of PAHs in sewage sludge-amended soils.
可生物利用的多环芳烃（自由溶解浓度，Cfree）在污水污泥（SL）或添加生物炭（BC）的污水污泥和土壤中进行了测定。将 SL 或 SL 与 2.5%、5%或 10%的 BC 施加到土壤中。该研究作为一个长期田间试验进行。在 2.5%和 5%的剂量下向 SL 添加 BC 不会影响土壤中 Cfree PAHs 的含量。然而，在添加 10%BC 的实验中，Cfree PAHs 的含量存在显著差异（增加了 13%）。在实验过程中，SL 和 SL/BC 处理土壤中 Cfree PAHs 的浓度降低。特别是在采样期限内，SL/BC 处理土壤中 Cfree PAHs 的含量明显低于 SL 处理土壤中 Cfree PAHs 的含量。18 个月后，SL/BC 处理土壤中 Cfree PAH 的含量明显低于单独使用 SL 的实验，且与对照土壤中的Σ16 Cfree 含量无显著差异。与单独使用污水污泥的土壤相比，3-、5-和 6-环 PAHs 的相对减少量最大。这是第一个基于田间的证据，表明生物炭土壤改良剂可有效降低污水污泥改良土壤中 Cfree PAHs 的含量。
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