Beijing Key Laboratory of Power Generation System Functional Material, China Energy New Energy Technology Institute, Beijing 102209, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.
Ecotoxicol Environ Saf. 2021 Jun 1;215:112175. doi: 10.1016/j.ecoenv.2021.112175. Epub 2021 Mar 24.
In this study, a low-temperature roasting and hydrothermal methods were used to modify the fly ash resulting in two new types of adsorption materials - modified fly ash (MFA) and artificial zeolite (ZE). These modified fly ashes, as well as a natural zeolite (ZO) were applied to two types of contaminated soils to explore their effects and mechanisms on the behavior of Cd and Pb through leaching column experiments. The bioavailable of Pb, Cd, pH, dissolved organic carbon (DOC), organic matter, as well as the microbial community changings were detected. The results showed that, 2% ZE has a significant stabilizing effect on Cd and the bioavailable fraction contents in Guanzhong (GZ) and Hunan (HN) soils decreased by 40.5% and 53.2%, respectively. However, for Pb, the 2% MFA showed a better result than that of ZE and ZO; the contents of bioavailable Pb in HN and GZ decreased by 48.3% and 30%, respectively. Furthermore, based on the Illumina NovaSep sequencing platform, 18 soil samples of GZ and HN were sequenced for microbial communities. As compared to the control blank(CK) treatment, the abundance of soil microbial communities was significantly improved in the amended soils.
在这项研究中，采用低温烘焙和水热法对粉煤灰进行了改性，得到了两种新型吸附材料——改性粉煤灰（MFA）和人工沸石（ZE）。将这些改性粉煤灰以及天然沸石（ZO）应用于两种污染土壤中，通过淋溶柱实验来研究它们对 Cd 和 Pb 行为的影响和作用机制。检测了 Pb、Cd 的生物有效性、pH 值、溶解有机碳（DOC）、有机质以及微生物群落的变化。结果表明，2%的 ZE 对 Cd 有显著的稳定作用，关中（GZ）和湖南（HN）土壤中 Cd 的生物有效态含量分别降低了 40.5%和 53.2%。然而，对于 Pb，2%的 MFA 比 ZE 和 ZO 的效果更好；HN 和 GZ 土壤中生物有效态 Pb 的含量分别降低了 48.3%和 30%。此外，基于 Illumina NovaSep 测序平台，对 GZ 和 HN 的 18 个土壤样本进行了微生物群落测序。与对照空白（CK）处理相比，改良土壤中土壤微生物群落的丰度得到了显著提高。
