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Conversion of Oyster Shell Waste to Amendment for Immobilising Cadmium and Arsenic in Agricultural Soil.
Bulletin of Environmental Contamination and Toxicology ( IF 2.7 ) Pub Date : 2020-06-15 , DOI: 10.1007/s00128-020-02906-w
Dongxue Bi 1, 2 , Guodong Yuan 3 , Jing Wei 1 , Liang Xiao 1 , Lirong Feng 1
Affiliation  

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.

中文翻译:

将牡蛎壳废料转化为用于固定农业土壤中镉和砷的修正案。

在400–800°C下煅烧了大块的牡蛎壳(OS),以生产富含钙的产品(OS 400 –OS 800),以减少人体对土壤镉(Cd)和砷(As)的健康风险。使用热重分析,X射线衍射(XRD),扫描电子显微镜(SEM)和BET方法来表征OS及其煅烧产物。OS和OS 400 -OS 700去除小Cd和从水作为,而OS 800去除1508毫克Cd或514毫克以每千克中OS的800从1032毫克镉/ L或257毫克作为/通过吸附和沉淀大号的解决方案。添加OS 800以2%的剂量添加到受Cd和As污染的土壤中,将其可交换Cd从60%降低至27%,并将蔬菜白菜的可食部分中Cd含量从2.80降低至0.048 mg / kg,将As从1.73降低至0.47毫克/千克 将OS转换为土壤改良剂具有土壤修复和可持续牡蛎养殖的双重好处。
更新日期:2020-06-15
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