Application of unsegregated municipal solid waste char produced at low temperature and vermicompost for remediation of coal mine tailing soil.

IF 3.2 3区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Environmental Geochemistry and Health Pub Date : 2025-03-28 DOI:10.1007/s10653-025-02436-6

Silvia Saikia, Sajan Kumar Dansena, Ajay S Kalamdhad

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引用次数: 0

Abstract

The melioration of mine tailing soil (MTS) with unsegregated municipal solid waste (MSW) char and vermicompost (VC) significantly improved soil properties. The novelty of this research lies in utilizing MSW char derived directly from landfill waste, combined with VC, to enhance soil properties while mitigating heavy metal toxicity. Results indicate that 10% MSW char increased soil pH by 45.44% and specific gravity by 4%, while a 5% char and 30% VC mix improved volatile solids, electrical conductivity, water holding capacity, and total Kjeldahl nitrogen by 2.45, 1.76, 2.96, and 2.79 fold, respectively, with a 3.3% reduction in bulk density. Heavy metal immobilization was significant, with total Fe, Ni, and Pb reducing by 28%, 22%, and 9%, respectively. Bioavailable Fe decreased by 89% with 20% char, while Ni and Pb bioavailability dropped to undetectable levels. Metal leachability was minimized, reducing Ni and Pb by 30% and 61%, respectively. These findings highlight the effectiveness of MSW char and VC in improving MTS properties, enhancing nutrient retention, and mitigating heavy metal risks, offering a sustainable approach for mine land restoration.

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应用低温下产生的未分离城市固体废弃物炭和蛭肥修复煤矿尾矿土壤。

用未分离的城市固体废物（MSW）炭和蛭石堆肥（VC）改良矿山尾矿土壤（MTS），可显著改善土壤性质。这项研究的新颖之处在于利用直接从垃圾填埋场垃圾中提取的城市固体废物炭与蛭石堆肥相结合，在改善土壤性质的同时减轻重金属毒性。结果表明，10% 的城市固体废弃物炭能使土壤 pH 值提高 45.44%，比重提高 4%；5% 的炭和 30% 的 VC 混合物能使挥发性固体、导电性、持水性和凯氏总氮分别提高 2.45、1.76、2.96 和 2.79 倍，容重降低 3.3%。重金属固定化效果显著，总铁、镍和铅分别减少了 28%、22% 和 9%。含 20% 炭的铁的生物利用率降低了 89%，而镍和铅的生物利用率则降至检测不到的水平。金属浸出率降到了最低，镍和铅分别减少了 30% 和 61%。这些发现凸显了城市固体废弃物炭和 VC 在改善 MTS 特性、提高养分保留率和降低重金属风险方面的有效性，为矿区土地恢复提供了一种可持续的方法。

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来源期刊

Environmental Geochemistry and Health 环境科学-工程：环境

CiteScore

8.00

自引率

4.80%

发文量

279

审稿时长

4.2 months

期刊介绍： Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people. Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes. The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.