Key Lab of Urban Environment and Health, Institute of Urban Environment, CAS, Xiamen, China; Department of Environmental Science, University of Peshawar, Pakistan.
Key Lab of Urban Environment and Health, Institute of Urban Environment, CAS, Xiamen, China; Department of Environmental Science, University of Peshawar, Pakistan.
Chemosphere. 2014 Jun;105:53-61. doi: 10.1016/j.chemosphere.2013.11.064. Epub 2013 Dec 19.
The presence of contaminants such as polycyclic aromatic hydrocarbons (PAHs) and potentially toxic elements (PTEs), including As, Cd, Cu, Pb and Zn, restricts the application of sewage sludge (SS) to agricultural land. This research established that the conversion of SS to SS biochar (SSBC) significantly (p ≤ 0.01) decreased PAH and available PTE concentrations. Once added to soil both SS and SSBC significantly (p ≤ 0.05) decrease PAH availability. Bioaccumulation of PAHs into Cucumis sativa L. was reduced by both SSBC (44-57%) and (to a lesser extent 20-36%) by SS. Following addition to soil SSBC significantly (p ≤ 0.05) reduced available PTEs (except Cd), while SS significantly (p ≤ 0.05) increased PTE availability. As a consequence SSBC significantly (p ≤ 0.05) reduced PTE bioaccumulation (except Cd and Zn), while SS increased PTE bioaccumulation. These results suggest SSBC to be a candidate for soil amendment that offers advantages over SS in terms of PAH/PTE bioaccumulation mitigation.
存在多环芳烃（PAHs）和潜在有毒元素（PTEs）等污染物，包括砷、镉、铜、铅和锌，限制了污水污泥（SS）在农业用地中的应用。本研究表明，将 SS 转化为 SS 生物炭（SSBC）显著（p≤0.01）降低了 PAH 和有效 PTE 浓度。SS 和 SSBC 一旦添加到土壤中，均显著（p≤0.05）降低了 PAH 的有效性。PAHs 在黄瓜中的生物累积被 SSBC（44-57%）和 SS（在较小程度上为 20-36%）显著降低。添加到土壤后，SSBC 显著（p≤0.05）降低了有效 PTE（除 Cd 外），而 SS 则显著（p≤0.05）增加了 PTE 的有效性。因此，SSBC 显著（p≤0.05）降低了 PTE 的生物累积（除 Cd 和 Zn 外），而 SS 则增加了 PTE 的生物累积。这些结果表明，SSBC 是一种土壤改良剂的候选物，在 PAH/PTE 生物累积缓解方面优于 SS。
