Study on the performance of red mud modified biochar for remediation of lead contaminated soil

被引：0
|
作者：
Liu X. [1 ,3 ]
Dong X. [1 ]
Li J. [1 ]
Chang S. [1 ]
Xu X. [2 ]
Li J. [1 ]
Pu H. [1 ,4 ]
机构：
[1] Taiyuan University of Technology, Taiyuan
[2] Jilin University, Changchun
[3] Institute of Rock and Soil Mechanics, Chinese Academy of sciences, Wuhan
[4] Huazhong University of Science and Technology, Wuhan
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2023年 / 56卷
关键词：
engineering properties; lead contaminated soil; red mud modified biochar; solidification and stabilization mechanism; solidification/stabilization;
D O I：
10.15951/j.tmgexb.2023.S2.t24
中图分类号：
学科分类号：
摘要：
A key environmental issue that hinders society's ability to grow sustainably is soil contaminated by heavy metals. This study examines the impact of red mud modified biochar ( RMBC ) on the physicochemical properties, remediation effectiveness, and engineering properties of lead-contaminated soils in the context of " carbon peaking and carbon neutrality. " The outcomes show that RMBC can raise the pH level and lower the soil's electrical conductivity ( EC). The pH value increases and the EC value decreases with increasing RMBC dosage. Leaching toxicity experiments using hydrochloric acid extraction revealed that when RMBC dosage and remediation time increase, the leaching concentration of Pb (II) in the soil decreases. For the soil contaminated by lead , the 7% RMBC dosage shows the optimum remediation efficacy. Additionally, the addition of RMBC can compact the soil, somewhat increasing its bearing capacity and seepage resistance. Microscopic analyses reveal that the remediation mechanism of RMBC involves a combination of complexation, ion exchange, and precipitation reactions. Red mud modified biochar has the ability to effectively adsorb and immobilize heavy metal ions in soil, as well as improve the relevant properties of the soil. It holds significant potential for pollution remediation and engineering applications. © 2023 Editorial Office of China Civil Engineering Journal. All rights reserved.
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页码：104 / 114
页数：10
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