Stabilization of Pb and Cd contaminated soils and soil quality improvements using waste oyster shells

作者：Ok Yong Sik; Lim Jung Eun; Moon Deok Hyun^*

来源：Environmental Geochemistry and Health, 2011, 33(1): 83-91.

DOI：10.1007/s10653-010-9329-3

• Waste oyster shells
• Soil quality
• Stabilization
• Availability
• Lead
• Cadmium

Large amounts of oyster shells are produced as a by-product of shellfish farming in coastal regions without beneficial use options. Accordingly, this study was conducted to evaluate the potential for the use of waste oyster shells (WOS) containing a high amount of CaCO(3) to improve soil quality and to stabilize heavy metals in soil. To accomplish this, an incubation experiment was conducted to evaluate the ability of the addition of 1-5 wt% WOS to stabilize the Pb (total 1,246 mg/kg) and Cd (total 17 mg/kg) in a contaminated soil. The effectiveness of the WOS treatments was evaluated using various single extraction techniques. Soil amended with WOS was cured for 30 days complied with the Korean Standard Test method (0.1 M center dot HCl extraction). The Pb and Cd concentrations were less than the Korean warning and countermeasure standards following treatment with 5 wt% WOS. Moreover, the concentrations of Cd were greatly reduced in response to WOS treatment following extraction using 0.01 M center dot CaCl(2), which is strongly associated with phytoavailability. Furthermore, the soil pH and exchangeable Ca increased significantly in response to WOS treatment. Taken together, the results of this study indicated that WOS amendments improved soil quality and stabilized Pb and Cd in contaminated soil. However, extraction with 0.43 M center dot CH(3)COOH revealed that remobilization of heavy metals can occur when the soil reaches an acidic condition.

• 出版日期2011-2