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- Title
Low-thermal remediation of mercury-contaminated soil and cultivation of treated soil.
- Authors
Zhao, Ting; Yu, Zhi; Zhang, Junfang; Qu, Liya; Li, Ping
- Abstract
In this study, low-thermal technology was used to treat the mercury contaminated farmland soil from a chemical plant in Guizhou Province, China. A series of field planting experiments were also aimed at determining the content of total and methyl-Hg in crop plants after thermal treatment. The results showed that the mercury concentration in soils was reduced about 70% from 255.74 mg/kg to 80.63 mg/kg when treated at 350 °C for 30 min in engineering-scale experiments, and the treated soil retained most of its original soil. Organic-bound and residual mercury in treated soil were reduced by 64.1 and 56.4% by means of a sequential extraction procedure, respectively. The total and methyl-mercury concentrations in crops decreased significantly, and the degree of soil mercury accumulation to crop roots has been reduced significantly. The total Hg concentrations in potato and corn were lower than the mercury tolerance limits for food in China, and the Hg concentration of radish was close to the limit. The technology provides a more sustainable remediation method for treating mercury-contaminated farmland soil in future engineering applications.
- Subjects
MERCURY in soils; TILLAGE; HEAT treatment; BIOACCUMULATION; CROPS
- Publication
Environmental Science & Pollution Research, 2018, Vol 25, Issue 24, p24135
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-018-2387-2