School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing, 100083, PR China.
School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing, 100083, PR China.
J Hazard Mater. 2020 Apr 15;388:121784. doi: 10.1016/j.jhazmat.2019.121784. Epub 2019 Nov 30.
As an immobilizing agent for metal ions, basic oxygen furnace slag may affect bacterial community succession, thus further promote metal ion immobilization in acidic contaminated soil. In this work, pot experiments were conducted to study the effects of adding 10 g/kg (S10) and 15 g/kg (S15) slag on soil properties, plant growth, bacterial community succession and various metal ion immobilization in acidic mine soils contaminated by Pb, Zn, Cu, Cr and Cd. The results showed that after 93 days of potting, the soil pH, electrical conductivity, total nitrogen and organic carbon content increased significantly (P < 0.05), and the dry weight of Poa pratensis L. increased significantly (P < 0.05) in S10 and S15 compared with in original soil group. With slag addition and plant growth, the diversity and richness indices of bacterial communities greatly improved, and at the genus level, the abundance of metal-tolerant bacteria and bacteria beneficial to plant growth increased, while the abundance of acidophiles decreased. After adding slag to the soil, the various metals were immobilized because slag could not only immobilize metal ions through ion exchange and coprecipitation, but also benefit plant growth and bacterial community succession which further promote the immobilization of metal ions.
作为金属离子的固定剂，碱性转炉渣可能会影响细菌群落演替，从而进一步促进酸性污染土壤中金属离子的固定。本研究采用盆栽实验，研究了添加 10g/kg（S10）和 15g/kg（S15）炉渣对 Pb、Zn、Cu、Cr 和 Cd 污染酸性矿山土壤性质、植物生长、细菌群落演替以及各种金属离子固定化的影响。结果表明，盆栽 93 天后，S10 和 S15 处理的土壤 pH 值、电导率、全氮和有机碳含量显著增加（P<0.05），而高羊茅的干重也显著增加（P<0.05）。与原始土壤组相比，随着炉渣的添加和植物的生长，细菌群落的多样性和丰富度指数显著提高，在属水平上，耐金属细菌和有利于植物生长的细菌的丰度增加，而嗜酸菌的丰度降低。向土壤中添加炉渣后，各种金属被固定，因为炉渣不仅可以通过离子交换和共沉淀固定金属离子，还可以促进植物生长和细菌群落演替，从而进一步促进金属离子的固定。
