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• W2097247943 endingPage "1705" @default.
• W2097247943 startingPage "1699" @default.
• W2097247943 abstract "Remediation of heavy metal polluted sediment by extracting the metals with sulfuric acid can be performed as follows: abiotic suspension leaching, microbial suspension leaching, abiotic solid-bed leaching, and microbial solid-bed leaching. Abiotic leaching means that the acid is directly added, while microbial leaching means that the acid is generated from sulfur by microbes (bioleaching). These four principles were compared to each other with special emphasis on the effectiveness of metal solubilization and metal removal by subsequent washing. Abiotic suspension leaching was fastest, but suspending the solids exhibits some disadvantages (low solid content, costly reactors, permanent input of energy, high water consumption, special equipment required for solid separation, large amounts of waste water, sediment properties hinder reuse), which prevent suspension leaching in practice. Abiotic solid-bed leaching implies the supply of acid by percolating water which proceeds slowly due to a limited bed permeability. Microbial solid-bed leaching means the generation of acid within the bed and has been proven to be the only principle applicable to practice. Metal removal from leached sediment requires washing with water. Washing of solid beds was much more effective than washing of suspended sediment. The kinetics of metal removal from solid beds 0.3, 0.6 or 1.2m in height were similar; when using a percolation flow of 20lm(-2)h(-1), the removal of 98% of the mobile metals lasted 57-61h and required 8.5, 4.2 or 2.3lkg(-1) water. This means, the higher the solid bed, the lower the sediment-mass-specific demand for time and water." @default.
• W2097247943 created "2016-06-24" @default.
• W2097247943 creator A5046378393 @default.
• W2097247943 creator A5068801760 @default.
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• W2097247943 date "2007-01-01" @default.
• W2097247943 modified "2023-10-17" @default.
• W2097247943 title "Remediation of heavy metal polluted sediment by suspension and solid-bed leaching: Estimate of metal removal efficiency" @default.
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• W2097247943 doi "https://doi.org/10.1016/j.chemosphere.2006.07.015" @default.
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• W2097247943 hasPublicationYear "2007" @default.
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