将牡蛎壳废料转化为改良剂，用于固定农业土壤中的镉和砷。
Conversion of Oyster Shell Waste to Amendment for Immobilising Cadmium and Arsenic in Agricultural Soil.
机构信息
Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, Shandong, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
出版信息
Bull Environ Contam Toxicol. 2020 Aug;105(2):277-282. doi: 10.1007/s00128-020-02906-w. Epub 2020 Jun 15.
A bulky waste, oyster shell (OS), was calcinated at 400-800°C to produce Ca-rich products (OS-OS) 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 OS-OS removed little Cd and As from water, whereas OS removed 1508 mg Cd or 514 mg As per kg of OS from solutions of 1032 mg Cd/L or 257 mg As/L via adsorption and precipitation. Adding OS 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.
牡蛎壳（OS）是一种体积较大的废物，在 400-800°C 下煅烧可得到富含钙的产物（OS-OS），以降低土壤中镉（Cd）和砷（As）对人体健康的风险。采用热重分析、X 射线衍射（XRD）、扫描电子显微镜（SEM）和 BET 方法对 OS 及其煅烧产物进行了表征。OS 和 OS-OS 对水中的 Cd 和 As 的去除效果较小，而 OS 通过吸附和沉淀，可从浓度为 1032 mg/L 的 Cd 溶液或 257 mg/L 的 As 溶液中，每公斤 OS 去除 1508 mg Cd 或 514 mg As。向 Cd 和 As 污染土壤中添加 2%剂量的 OS，可将其可交换态 Cd 从 60%降低至 27%，并将蔬菜白菜中 Cd 的含量从 2.80 降低至 0.048mg/kg，As 的含量从 1.73 降低至 0.47mg/kg。将 OS 转化为土壤改良剂，对土壤修复和可持续牡蛎养殖具有双重好处。
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