Effect of water-soluble thiourea formaldehyde (WTF) on soil contaminated with high copper (Ⅱ) concentration
| Autor: | Kai Zhang, Shan-Shan Yao, Chen Miao, She-Jiang Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chelating resin
021110 strategic defence & security studies Environmental Engineering Environmental remediation Health Toxicology and Mutagenesis Soil organic matter 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Biodegradation 01 natural sciences Pollution Sodium sulfide Metal chemistry.chemical_compound chemistry visual_art Environmental chemistry Soil stabilization visual_art.visual_art_medium Environmental Chemistry Waste Management and Disposal Carbon 0105 earth and related environmental sciences |
| Zdroj: | Journal of hazardous materials. 409 |
| ISSN: | 1873-3336 |
| Popis: | It is very important to seek a heavy metal soil stabilization/solidification (S/S) agent that has less risk of secondary release and has less impact on the soil. This study explored the repair effect of a new resin repair agent water-soluble thiourea-formaldehyde (WTF), and its stability under indigenous biodegradation and compared the repair effect with sodium sulfide (Na2S) and hydroxyapatite (HAP). Diethylene triamine pentaacetic acid leaching experiments show that WTF can effectively solidify/stabilize 97.9-84.7% of Cu. At the same time, heavy metal speciation analysis experiments show that WTF does indeed convert the exchangeable Cu in the soil into a non-exchangeable form. Research on soil organic matter, biological carbon and enzyme activity after remediation shows that WTF has a more positive effect on soil function, compared with HAP and Na2S. Experiments using indigenous microorganisms to decompose the precipitation formed by WTF and Cu show that under the condition of less impact on soil microorganisms, the risk of secondary release of heavy metals caused by soil microorganisms after WTF remediation is less. These findings provide valuable experience for understanding the role of resin structure in preventing the secondary release of heavy metals and restoring soil function. |
| Databáze: | OpenAIRE |
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