Resource and Environment Department, Shijiazhuang University, Hebei, 050000, China; Post-Doctoral Research Station of Ecology, Hebei Normal University, Hebei, 050024, China.
College of Environmental Science and Tourism, Nanyang Normal University, Henan, 473061, China.
J Hazard Mater. 2018 Feb 5;343:276-284. doi: 10.1016/j.jhazmat.2017.09.040. Epub 2017 Sep 25.
Sawdust and wheat straw biochars prepared at 300°C and 500°C were applied to petroleum-polluted soil for an 84-day incubation to estimate their effectiveness on polycyclic aromatic hydrocarbons (PAHs) removal. Biochars alone were most effective at reducing PAHs contents. However, adding biochar to soils in company with NaN solution resulted in a decreasing trend in terms of PAHs removal, which was even lower than treatment CK without biochar. Moreover, it was discovered by PCR-DGGE files and sequencing analysis that the predominant bacterial diversity slightly decreased but the abundance of some specific taxa, including PAHs degraders, was promoted with biochar input. These results highlighted the potential of biochar application on accelerating PAHs biodegradation, which could be attributed to the properties of biochars that benefit for making the amended soil a better habitat for microbes. The impacts of biochar preparation and pollutants nature on PAHs removal were also determined. Significant reduction in the PAHs contents was detected when adding biochar prepared at a high temperature (500°C), while the feedstocks of biochar showed little effect on PAHs removal. Due to the high hydrophobicity of aromatic rings, high-molecular weight PAHs were found much more resistant to microbial degradation in comparison with low-molecular weight PAHs.
在 300°C 和 500°C 下制备的木屑和麦秆生物炭被应用于石油污染土壤中进行 84 天的孵化，以评估它们对多环芳烃（PAHs）去除的效果。生物炭单独使用时最有效地降低 PAHs 含量。然而，将生物炭与 NaN 溶液一起添加到土壤中会导致 PAHs 去除呈下降趋势，甚至低于没有生物炭的 CK 处理。此外，通过 PCR-DGGE 文件和测序分析发现，主要细菌多样性略有下降，但包括 PAHs 降解菌在内的一些特定类群的丰度增加。这些结果突出了生物炭应用于加速 PAHs 生物降解的潜力，这可能归因于生物炭的特性，有利于使改良土壤成为微生物的更好栖息地。还确定了生物炭制备和污染物性质对 PAHs 去除的影响。当添加在高温（500°C）下制备的生物炭时，检测到 PAHs 含量显著降低，而生物炭的原料对 PAHs 去除几乎没有影响。由于芳环的高疏水性，与低分子量 PAHs 相比，高分子量 PAHs 被发现更能抵抗微生物降解。
