Effect of co-application of nano-zero valent iron and biochar on the total and freely dissolved polycyclic aromatic hydrocarbons removal and toxicity of contaminated soils
Effect of co-application of nano-zero valent iron and biochar on the total and freely dissolved polycyclic aromatic hydrocarbons removal and toxicity of contaminated soils
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DOI：
10.1016/j.chemosphere.2016.11.100
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发表时间：
2017-02-01
期刊：
影响因子：
8.8
通讯作者：
Koltowski, Michal
中科院分区：
文献类型：
--
作者：
Oleszczuk, Patryk;Koltowski, Michal
本研究的目的是调查共同应用的生物炭和纳米零价铁（nZVI），以增加多环芳烃的降解和降低这些化合物的历史污染的土壤的毒性。为了进行实验，将生物炭、生物炭与nZVI（2 g kg（-1）或10 g kg（-1）土壤）或单独的nZVI（2 g kg（-1）或10 g kg（-1）土壤）添加到多环芳烃污染的土壤中。通过混合7天和30天使单独的土壤和具有改良剂的土壤老化。之后，进行化学分析，并确定样品中的总（C-tot）和无C PAH含量。此外，使用Microtox（（R））（费氏弧菌）方法研究了水提取物的毒性。结果表明，任何nZVI处理都不能降低污染土壤中Ctot和Cfree多环芳烃的含量，但生物炭单独施用和与nZVI配合施用均能显著降低Ctot和Cfree多环芳烃的含量。然而，没有显着差异，在PAH的减少单独的生物炭和生物炭与nZVI添加。这表明所观察到的减少主要与生物炭的吸附性能有关。此外，仅在生物炭和nZVI共同施用的情况下，观察到nZVI对费氏弧菌的毒性降低。不同土壤类型及其性质（包括总有机碳和黑碳含量）对多环芳烃的毒性效应不同，可能影响多环芳烃的还原效率。(C)2016爱思唯尔有限公司版权所有。
The aim of this study was to investigate co-application of biochar and nano zero-valent iron (nZVI) in order to increase the degradation of PAHs and reduce the toxicity of soils historically contaminated with these compounds. To performed the experiment biochar, biochar with nZVI (2 g kg(-1) or 10 g kg(-1) soil), or nZVI alone (2 g kg(-1) or 10 g kg(-1) soil) were added to the PAHs contaminated soils. The soils alone and soils with amendments were aged by mixing for 7 and 30 days. After that the chemical analysis were carried out and total (C-tot) and C-free PAH content in the samples were determined. Moreover, the toxicity of aqueous extracts were investigated using the Microtox((R)) (Vibrio fischeri) method. Results showed that any of used nZVI dose did not reduce the content of Ctot or Cfree PAHs in contaminated soils, but biochar applied both alone and together with the nZVI significantly reduced C-tot and C-free PAHs. However, no significant differences in PAH reduction were found between biochar alone and biochar with nZVI addition. This indicates that the observed reduction was mostly associated with the sorption properties of biochar. Moreover, only in the case of co-application of biochar and nZVI reduction of the toxicity of nZVI to V. fischeri was observed. The toxic effect was different and depend on the type of soil and their properties including total organic carbon and black carbon content, which may affect the PAH5 reduction efficiency. (C) 2016 Elsevier Ltd. All rights reserved.