{"title":"Remediation of zinc and cadmium polluted soil using CaCO<sub>3</sub>-biochar.","authors":"Shaon Kumar Das","doi":"10.1007/s10653-025-02582-x","DOIUrl":null,"url":null,"abstract":"<p><p>Hazardous substances like zinc and cadmium can be released into the soil by ore mining and other industrial operations, which could endanger the environment. Biochar made from biomass pyrolysis is suggested as a sorption treatment for contaminated soils, enhancing microbial activity, soil fertility, and water retention. Utilizing four different biochar the average removal rate of heavy metal from aqueous solution was 48.2-65.7% (Cd), 46.2-59.1% (Pb), 46.7-59.3% (Ni), 45.2-59.4% (Zn), 48.7-62.4% (Cu), and 51.8-63.7% (As) compared to no biochar treatment. The percent decrease of Pb heavy metal adsorption with increase in maximum contaminant level (MCL) from one to five fold was 55.8 (RJB), 54.9 (SBB), 53.6 (PTB), and 51.3 (BMB). Effect of dose study showed that the As adsorption on all the four types of biochar was most favourable and Ni adsorption was the most awful. Results revealed that the wastewater COD<sub>T</sub>, TSS, ammonia, TKN and TP values demonstrated an 89.2-91.8%, 85.3-82.7%, 89.4-87.9%, 59.2-70.5% and 89.3-78.8% decrease, respectively. Additionally, the wastewater As, Cd, Cr, Pb, Zn and Cu values resulted an 76.9-84.2%, 50.5-92.4%, 81.5-86.2%, 92.8-75.1%, 88.4-92.5% and 93.3-95.5% decrease, respectively after being passed via biochar bio-filter.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"47 7","pages":"274"},"PeriodicalIF":3.2000,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Geochemistry and Health","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s10653-025-02582-x","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Hazardous substances like zinc and cadmium can be released into the soil by ore mining and other industrial operations, which could endanger the environment. Biochar made from biomass pyrolysis is suggested as a sorption treatment for contaminated soils, enhancing microbial activity, soil fertility, and water retention. Utilizing four different biochar the average removal rate of heavy metal from aqueous solution was 48.2-65.7% (Cd), 46.2-59.1% (Pb), 46.7-59.3% (Ni), 45.2-59.4% (Zn), 48.7-62.4% (Cu), and 51.8-63.7% (As) compared to no biochar treatment. The percent decrease of Pb heavy metal adsorption with increase in maximum contaminant level (MCL) from one to five fold was 55.8 (RJB), 54.9 (SBB), 53.6 (PTB), and 51.3 (BMB). Effect of dose study showed that the As adsorption on all the four types of biochar was most favourable and Ni adsorption was the most awful. Results revealed that the wastewater CODT, TSS, ammonia, TKN and TP values demonstrated an 89.2-91.8%, 85.3-82.7%, 89.4-87.9%, 59.2-70.5% and 89.3-78.8% decrease, respectively. Additionally, the wastewater As, Cd, Cr, Pb, Zn and Cu values resulted an 76.9-84.2%, 50.5-92.4%, 81.5-86.2%, 92.8-75.1%, 88.4-92.5% and 93.3-95.5% decrease, respectively after being passed via biochar bio-filter.
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.
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