A bulky waste, oyster shell (OS), was calcinated at 400–800°C to produce Ca-rich products (OS400–OS800) to reduce the human health risk of soil cadmium (Cd) and arsenic (As). Thermogravimetric analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), and BET method were used to characterize OS and its calcined products. OS and OS400–OS700 removed little Cd and As from water, whereas OS800 removed 1508 mg Cd or 514 mg As per kg of OS800 from solutions of 1032 mg Cd/L or 257 mg As/L via adsorption and precipitation. Adding OS800 at a 2% dose to a Cd- and As-contaminated soil lowered its exchangeable Cd from 60% to 27%, and reduced Cd content in the edible part of vegetable Bok Choy from 2.80 to 0.048 mg/kg and As from 1.73 to 0.47 mg/kg. Converting OS to soil amendment has the dual benefits to soil remediation and sustainable oyster aquaculture.
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This work was supported by the Chinese National Key Research and Development Program (2016YFD0200303) and the National Natural Science Foundation of China (41501522), and Guangdong Technology and Equipment Research Center for Soil and Water Pollution Control. Three anonymous reviewers are appreciated for comments and suggestions.
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Bi, D., Yuan, G., Wei, J. et al. Conversion of Oyster Shell Waste to Amendment for Immobilising Cadmium and Arsenic in Agricultural Soil. Bull Environ Contam Toxicol (2020). https://doi.org/10.1007/s00128-020-02906-w
- Oyster shell waste
- Soil remediation