Efficient removal of molybdate from groundwater with visible color changes using wasted aerobic granular sludge
Efficient removal of molybdate from groundwater with visible color changes using wasted aerobic granular sludge
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DOI：
10.1016/j.seppur.2023.123849
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发表时间：
2023-04
影响因子：
8.6
通讯作者：
Tian Yuan;Jing Xu;Zhiwei Wang;Z. Lei;M. Kato;K. Shimizu;Zhenya Zhang
中科院分区：
文献类型：
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作者：
Tian Yuan;Jing Xu;Zhiwei Wang;Z. Lei;M. Kato;K. Shimizu;Zhenya Zhang
在美国、中国和蒙古等世界各地都发现了高含量的钼，因此地下水中的钼污染日益引起人们的关注。虽然钼被认为是所有生物体的必需元素，但暴露于高水平的钼可能导致胃肠道、肝脏和肾脏紊乱。因此，本研究探讨了利用污水处理过程中产生的废好氧颗粒污泥（AGS）去除地下水中钼酸盐的可能性。结果表明，在初始pH为2.0时，AGS的理论吸附量为190.4 mg Mo/g。钼浓度高达500 μg/L，颗粒剂剂量为5 g/L时，可修复至低于世界卫生组织（WHO）建议的指导值70 μg/L。当吸附钼量逐渐增加到最大值时，颗粒的颜色由黄色变为绿色，最后变为白霜色。该研究表明，废AGS可作为一种创新材料，在实际应用中有效去除地下水中的钼酸盐，具有可见的快速检测终点。
Molybdenum pollution in groundwater is drawing increasing attention since high levels of molybdenum have been detected worldwide, including in the United States, China, and Mongolia. Although molybdenum is considered an essential element for all living organisms, exposure to high levels of molybdenum may result in disorders of the gastrointestinal tract, liver, and kidney. Thus, this study explored the possibility of molybdate removal in groundwater using wasted aerobic granular sludge (AGS) generated in the sewage treatment process. The results showed that AGS has an excellent theoretical adsorption capacity of 190.4 mg Mo/g at initial pH of 2.0. The molybdenum concentrations of up to 500 μg/L can be remediated to levels lower than the guideline value of 70 μg/L advised by the World Health Organization (WHO) at a granule dosage of 5 g/L. The color of granules changed from yellow to green and finally to a glaucous color when the amount of adsorbed molybdenum gradually increased to the maximum. This study suggested that wasted AGS can be an innovative material for efficient molybdate removal in groundwater with a visible endpoint for rapid detection in practical application.