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Impacts of biochar and oyster shells waste on the immobilization of arsenic in highly contaminated soils

Chen, Yongshan ; Xu, Jinghua ; Lv, Zhengyong ; Xie, Ruijia ; Huang, Liumei ; Jiang, Jinping

Journal of environmental management, 01 July 2018, Vol.217, pp.646-653 [Periódico revisado por pares]

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  • Título:
    Impacts of biochar and oyster shells waste on the immobilization of arsenic in highly contaminated soils
  • Autor: Chen, Yongshan ; Xu, Jinghua ; Lv, Zhengyong ; Xie, Ruijia ; Huang, Liumei ; Jiang, Jinping
  • Assuntos: Arsenate ; Arsenite ; Biochar ; Column Leaching ; Oyster Shells Waste ; Soil Contamination ; Charcoal ; Arsenic -- Chemistry ; Soil Pollutants -- Chemistry
  • É parte de: Journal of environmental management, 01 July 2018, Vol.217, pp.646-653
  • Descrição: Soil contamination is a serious problem with deleterious impacts on global sustainability. Readily available, economic, and highly effective technologies are therefore urgently needed for the rehabilitation of contaminated sites. In this study, two readily available materials prepared from bio-wastes, namely biochar and oyster shell waste, were evaluated as soil amendments to immobilize arsenic in a highly As-contaminated soil (up to 15,000 mgAs/kg). Both biochar and oyster shell waste can effectively reduce arsenic leachability in acid soils. After application of the amendments (2-4% addition, w/w), the exchangeable arsenic fraction decreased from 105.8 to 54.0 mg/kg. The application of 2%biochar +2% oyster shell waste most effectively reduced As levels in the column leaching test by reducing the arsenic concentration in the porewater by 62.3% compared with the treatment without amendments. Biochar and oyster shell waste also reduced soluble As(III) from 374.9 ± 18.8 μg/L to 185.9 ± 16.8 μg/L...
  • Idioma: Inglês

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