摘要
随着矿产资源的不断开采,矿区土壤中的重金属污染问题日益严峻,特别是锰污染对土壤和生态环境造成了严重的威胁。为了解决这一问题,本研究采用微生物诱导碳酸盐沉淀技术(MICP)修复内蒙古某铁锰尾矿区周边农田污染土壤,探索了巴氏芽孢杆菌与助剂(生物炭)和成核剂(柠檬酸钠)的联合使用对土壤修复效果的影响。通过设置空白对照组(CK)、菌剂单独处理组(B)、菌剂+助剂组(B+A)、菌剂+成核剂组(B+N)多种处理组,评估不同修复方法对土壤pH值、容重、含水率、养分、有机质含量、酶活性以及锰形态变化的影响。结果表明,MICP技术显著改善了土壤结构,提高了土壤肥力,降低了土壤中锰的可交换态和浸出毒性,且强化处理组(B+A和B+N)比单一菌剂处理更有效。修复后,土壤中锰的碳酸盐结合态显著增加,重金属的生物有效性明显降低,作物生长得到显著促进。研究表明,MICP技术,尤其是通过添加外源助剂和成核剂的强化处理,能够有效修复矿区污染土壤,具有广泛的应用前景。
As mineral resources continue to be exploited,the problem of heavy metal contamination in mining areas has become increasingly severe,especially manganese contamination,which poses a significant threat to soil and the ecological environment.To address this issue,microbially induced carbonate precipitation(MICP)technology was employed to remediate contaminated farmland soil surrounding a manganese-iron tailings area in Inner Mongolia.The effects of the combined use of Bacillus pasteurii and additives(biochar)and nucleating agents(sodium citrate)on soil remediation were studied.Various treatment groups,including the blank control group(CK),the bacteria-only treatment group(B),the bacteria+additive group(B+A),and the bacteria+nucleating agent group(B+N),were set up to evaluate the effects of different remediation methods on soil pH,bulk density,moisture content,nutrients,organic matter content,enzyme activity,and the transformation of manganese species.The results show that MICP technology significantly improved soil structure,enhanced soil fertility,and reduced the exchangeable and leachable toxicity of manganese in the soil.Additionally,the enhanced treatment groups(B+A and B+N)are more effective than the bacteria-only treatment.After remediation,the carbonate-bound manganese content in the soil significantly increased,and the bioavailability of heavy metals is notably reduced,leading to significant improvements in crop growth.MICP technology,particularly when enhanced with external additives and nucleating agents was demonstrated,that effectively remediate contaminated mining soils and has broad application prospects.
作者
许欣
李勃昔
刘雪峰
皇晓刚
段耀庭
牛磊
王哲
郑春丽
XU Xin;LI Boxi;LIU Xuefeng;HUANG Xiaogang;DUAN Yaoting;NIU Lei;WANG Zhe;ZHENG Chunli(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China;Shanghai Polytechnic University,Shanghai 201209,China)
出处
《有色金属(中英文)》
北大核心
2025年第8期1439-1450,共12页
Nonferrous Metals
基金
内蒙古自治区直属高校基本科研业务费项目(2024QNJS093)
内蒙古自治区直属高校基本科研业务费项目(2023CXPT004)
鄂尔多斯市科技重大专项项目(2021ZD社14-16)
中央引导地方科技发展资金项目(2022ZY0217)
国家自然科学基金资助项目(52264013)。
关键词
微生物诱导碳酸盐沉淀(MICP)
矿区土壤修复
锰污染
microbial induced carbonate precipitation(MICP)
mine soil remediation
manganese contamination
作者简介
许欣(1991-),女,博士研究生,从事矿区生态修复研究;通信作者:郑春丽(1979-),女,博士研究生,教授,从事减污降碳与生态修复协同创新研究。
