Abstract
The effectiveness of used tire rubber for immobilizing Hg(II) in a contaminated soil was evaluated using batch extraction and field rainwater leaching tests. The contaminated soil prepared using a clay-loam spiked with mercury oxide or mercury chloride to yield a Hg(II) content of 300 mg/kg. When the contaminated soil was treated with 4% of tire rubber, Hg(II) concentration in an acetic acid leachate was reduced from 3500 ppb down to 34 ppb. Hg(II) concentration in the initial rainwater leachate was reduced from 84 ppb for untreated soil to 1.2 ppb for the rubber-treated soil. After 8 months of rainwater infiltration in the field, Hg(II) concentration decreased to less than 0.2 ppb for the treated soil. The rubber-treatment inhibited the evolution of metallic Hg0 from the spiked soil samples possibly by retarding the reduction of Hg(II) to Hg0. Batch extraction and adsorption results indicated that the rubber had high adsorption capacity for Hg(II) when pH values were between 2 and 8.
Original language | English |
---|---|
Pages (from-to) | 231-241 |
Number of pages | 11 |
Journal | Journal of Hazardous Materials |
Volume | 57 |
Issue number | 1-3 |
DOIs | |
State | Published - Jan 1998 |
Keywords
- Adsorption
- Contamination
- Evolution
- Immobilization
- Leachability
- Mercury
- Rubber
- Soil
- Stabilization
- TCLP