Transfer of heavy metals from compost to red soil and groundwater under simulated rainfall conditions.
It is well known that compost can be polluted with heavy metals. A self-designed soil column system was used to clarify the leaching or residue of heavy metals when compost was added to red soil. Less than 4% of Cu and more than 58.3% of Zn were transferred to groundwater. Maximum concentrations of Cu and Zn in leachate were 22 and 246 microg/L, respectively. pH in leachate decreased during 6.75-11.25 h, comparing with the control. Electrical conductivity was higher in the treatment of compost polluted by both Cu and Zn than that polluted only by Cu. Over 75.3% of Cu and 78.2% of Zn remained in the residual formation. Maximum bioavailability parameters in soil were 0.099 for Cu and 0.160 for Zn. Long-term field experiments with cycling application are needed to study the cycling effect on heavy metal residue in soil or leaching to the groundwater in the future.
Chen
Guiqiu
G
College of Environmental Science and Engineering, Hunan University, Changsha, China. guiqiuchen@gmail.com
Zeng
Guangming
G
Du
Chunyan
C
Huang
Danlian
D
Tang
Lin
L
Wang
Liang
L
Shen
Guoli
G
D004787:Environmental Pollution; D005544:Forecasting; D005618:Fresh Water / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000032:analysis*; D008962:Models, Theoretical; D011891:Rain; D012987:Soil / Q000032:analysis*
D019216:Metals, Heavy; D012987:Soil