环境工程学报2025，Vol.19Issue(6)：1455-1463,9.DOI:10.12030/j.cjee.202409030
生物炭-污泥协同黑麦草修复煤基固废堆场表层土壤及重金属污染风险评价
Collaborative remediation of heavy metal pollution and risk assessment in surface soil of coal-based solid waste dump using biochar,sludge and ryegrass
摘要
Abstract
To explore the remediation of surface soil in coal-based solid waste dumps using the synergistic effects of biochar,waterjet loom sludge and ryegrass,five heavy metals including Pb,Zn,Cd,Ni,and Cu were selected as representatives.Pot experiments were conducted by adding anaerobically treated and dewatered waterjet loom sludge(5％ and 15％)and biochar(3％)to the soil.This study analyzed the physical and chemical properties of the soil,the total and effective content of heavy metals,and their bioavailability to investigate the effects of sludge-biochar synergy with ryegrass on soil remediation and heavy metal extraction.The pollution risk of heavy metals in the remediated soil was evaluated using the potential ecological risk index method.Results indicated that the combination of sludge and biochar significantly increased the soil organic matter content.Compared to the control group,the addition of 15％ sludge with 3％ biochar increased the soil organic matter content by 7.7 times and reduced the bioavailability of Pb and Ni by 62％ and 71％,respectively.Under lower sludge ratios,biochar showed a significant passivation effect on Pb,Ni,and Cu,and had a notable positive effect on ryegrass growth.The simultaneous application of biochar and sludge enhanced the enrichment capacity of ryegrass for Zn(enrichment coefficient＞1),followed by Cd and Cu(enrichment coefficient 0.8～1.2).The combined application of biochar,sludge,and ryegrass reduced the single pollution risk index for Cd in the surface soil of coal-based solid waste dumps,with the overall potential ecological risk from the five heavy metals categorized as slight.In practical applications,it was suggested that the sludge ratio can be reduced,and biochar and plants that can extract heavy metals can be used together for heavy metal risk management.关键词
煤基固废堆场/重金属污染风险/植物修复/土壤污染/生物炭Key words
coal-based solid waste dump/heavy metal pollution risk/phytoremediation/soil pollution/biochar分类
资源环境引用本文复制引用
姜萌萌,钟崇巍,胡蝶,朱晓芳,黄赳..生物炭-污泥协同黑麦草修复煤基固废堆场表层土壤及重金属污染风险评价[J].环境工程学报,2025,19(6):1455-1463,9.基金项目
国家重点研发计划资助项目(2023YFC3804203) （2023YFC3804203）
中央高校基本科研业务费专项资金(2023QN1039) （2023QN1039）
江苏省卓博计划资助项目(2023ZB622) （2023ZB622）
