[1]XIANG Hefeng,YAN Yuzhou,XU Kai,et al.Effects of Biomass Ash on Soil Cadmium Migration Under Rainfall Conditions[J].Research of Soil and Water Conservation,2021,28(03):126-132.
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Effects of Biomass Ash on Soil Cadmium Migration Under Rainfall Conditions
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 03
Page number:
126-132
Column:
Public date:
2021-04-20
- Title:
- Effects of Biomass Ash on Soil Cadmium Migration Under Rainfall Conditions
- Keywords:
- environmental safety; cadmium migration; leaching; biomass ash; combustion
- CLC:
- X53
- DOI:
- -
- Abstract:
- This paper aims to explore the influence mechanism of biomass ash in forest fire on the migration behavior of cadmium(Cd)in soil under rainfall conditions. Biomass ash was prepared from camphor tree leaves by open combustion, and was added to the woodland soil at a ratio of 0, 5%. A series of soil column leaching experiments were carried out under two rain water conditions(pH=3.8, 7.0). The results showed that: pH, electrical conductivity(EC), DOC and CEC of soil soluble organic carbon(CEC)with addition of biomass ash were increased under both two leaching conditions; furthermore, pH and DOC values of soils leaching with acid water were slightly lower than those under the rain with pH 7.0; Cd concentration in the soil column with addition of biomass ash decreased by 2.5 mg/kg(pH=3.8), 2.8 mg/kg(pH=7.0); the total cumulative cadmium release decreased by 52.6%～64.6%, and the total leaching rate decreased by 2.8%～34.8%; the release process of Cd in soil was fitted by using parabolic diffusion equation and Elovich equation, indicating that the release process of Cd under rainfall conditions was a complex reaction process controlled by multiple factors and with large changes in activation energy. Biomass ash plays significant role in enhancement of soil physiochemical properties and reduction of the Cd migration with cheap, feasible, environmental-friendly operation, which may shed light on the application of Cd-polluted soil remediation.
- References:
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Last Update:
2021-04-20