1.Institute of Environment and Ecology，Shandong Normal University， Jinan 250014， China；

2.Shuifa Group Co.，Ltd.，Jinan 250102， China

Abstract

Objective The study primarily aims to implement effective and sustainable measures for the remediation of heavy metal pollution. As heavy metal pollution in soil， especially around mining areas， become increasingly severe， it is critical to adopt comprehensive and effective measures that significantly reduce heavy metal concentration in soil.

Methods The study addressed the specific challenges of cadmium （Cd） pollution in agricultural soil surrounding the tailings goaf of a mining facility in Shibuzi Town， Anqiu City， Shandong Province， China.To mitigate Cd contamination，the study developed four tailored soil amendments：sodium lignosulfonate-modified lignite humic acid， mineral-modified lignite humic acid， chitosan-modified lignite humicacid， and biochar-modified lignite humic acid.These amendments were designed to enhance soil properties and immobilize heavy metals， particularly cadmium. Using advanced analytical techniques， the impact of these modified humic acids on cadmium in the contaminated soil was systematically investigated.Laboratory experiments were conducted over an extended period to monitor changes in chemical speciation， providing a comprehensive understanding of theinteractions between soil amendments and cadmium.Furthermore， the studyanalyzed thephysicochemical properties of the soil before and after adding amendments， ensuring a thorough evaluation of their effectiveness. Based on the performance metrics from these tests， two of the most effective soil amendments were selected for further study and potential large-scale field application.

Results and Discussion The external morphologies of the four amendments closely matched their respective preparation methods， exhibiting advantageous physicochemical properties that enhanced soil quality. Notably， these amendments significantly increased the residual cadmium content in the treated soil， while reducing the bioavailable forms. In addition to the amendments， agronomic methods using hyperaccumulator plants， such as L. japonicaThunb.， were employed alongside strategic applications of sodium lignosulfonate-modified lignite humic acid and biochar-modified lignite humic acid. These interventions led to a substantial shiftin cadmium species within the amended soil， leading to a statistically significant reduction （p< 0.05） in cadmiumconcentrations. These findings underscore the importance of selecting appropriate amendments tailored to specific soil conditions.These selected amendments demonstrated a significant reduction in cadmium bioavailability， offering a promising solution for the restoration of Cd-contaminated agricultural soil in the region.

Conclusion This integrated approach achieved highly efficient removal of heavy metals， particularly cadmium （Cd）， from contaminated soil. The efficacy of this method demonstrates its potential as a robust solution for mitigating soil heavy metal pollution. The research results contribute significantly to the field of soil remediation，providing technical support for developing more effective and sustainable remediation techniques. The integration of advanced humic acid-based soil amendments with hyperaccumulator plants brings an efficient approach to mitigate soil contamination. Throughout the 60-day remediation period， regular monitoring and analysis confirmed the substantial reduction in heavy metal concentrations， validating the effectiveness of the proposed strategy. In conclusion， this study presents a novel and promising integrated approach for the remediation of heavy metal pollution insoil. The results provide valuable insights and practical guidance for further development of advanced soil remediation techniques. Future studies should focus on refining this integrated approach to achieve even greater efficacy in mitigating heavy metal pollutionin contaminated soil and ensuring long-term environmental sustainability.

Keywords：metallurgical dolomite tailing； heavy metal pollution； lignite humic acid； soil amendment； ecological remediation

Get Citation: CHEN Bo， YANG Ping， LI Jiameng， et al. Ecological remediation of cadmium pollution around metallurgical dolomite tailings goaf through the selection of soil amendments［J］. China Powder Science and Technology，2025，31（4）：1−9.

Received: 2024-09-27.Revised: 2024-12-15,Online: 2025-04-03.

Funding Project: 国家自然科学基金项目，编号：42077224；山东省重点研发计划重大科技创新工程，编号：2020CXGC011404。

First Author: 陈波（1983—），男，高级工程师，学士，研究方向为固废处置及污染治理。E-mail：13792125114@163. com。

Corresponding Author: 任宗明（1978—），男，教授，博士，博士生导师，泰山产业领军人才，研究方向为环境污染修复。Email：zmren@sdnu. edu. cn。

DOI：10.13732/j.issn.1008-5548.2025.04.016

CLC No: X53； TB4 Type Code:A

Serial No: 1008-5548（2025）04-0001-09