Multistage remediation of heavy metal contaminated river sediments in a mining region based on particle size
| Autor: | Jianzhang Sun, Yingjie Meng, Yanqing Sheng, Tao Ma |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
China
Geologic Sediments Environmental Engineering River ecosystem Municipal solid waste Environmental remediation Health Toxicology and Mutagenesis 0208 environmental biotechnology Industrial Waste 02 engineering and technology 010501 environmental sciences 01 natural sciences Mining Metal Rivers Metals Heavy Environmental Chemistry Recycling Environmental Restoration and Remediation 0105 earth and related environmental sciences Construction Materials Public Health Environmental and Occupational Health Sediment General Medicine General Chemistry Contamination Pollution 020801 environmental engineering Environmental chemistry visual_art visual_art.visual_art_medium Environmental science Leaching (metallurgy) Particle size Water Pollutants Chemical |
| Zdroj: | Chemosphere. 225 |
| ISSN: | 1879-1298 |
| Popis: | Sediment pollution is an important environmental problem, and the remediation of heavy metal contaminated sediments is crucial to river ecosystem protection, especially in mining regions. In this work, characteristics of heavy metals (Cu, Zn, Cd, As and Hg) were investigated, including contents and fractions based on particle size (PS) in river sediments. Chemical leaching and stabilization for sediment remediation were performed, and the technology feasibility was assessed. The results indicated that the heavy metals were primarily reserved within fine sediments (PS 150 μm), while the oxidizable fraction, reducible fraction and weak acid extractable fraction dominated the total content in fine sediments, except for that of Hg. Chemical leaching can transform most metals in sediments from large-sized particles to fine particles because the metals are absorbed by fine particles in solution rather than complexation. The stabilization suggested that cement could be an effective agent for ecological risk control for heavy metals. In field engineering, a total of 145,000 m3 sediment was divided into various sections by PS and synchronously washed by eluting agents. Finally, clean sediments (PS > 150 μm) were used as building material and clean backfilling; meanwhile, heavily polluted sediments (PS |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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