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氧化还原对富含铁的吸附材料的去除能力的影响

Isis S P C Scott¹, Chad J Penn²

¹Northwest Irrigation and Soils Research Laboratory, 3793 North 3600 East, Kimberly, 83301, Idaho, United States.

|February 16, 2024

概括

富含铁的吸附材料 (PSMs) 即使在无氧条件下也有效地保留,在氧气不足的时期后保持其P去除能力. 这种稳定性对于水处理结构的自下而上的流量设计至关重要.

科学领域:

环境工程环境工程
水质管理水质管理
土壤科学土壤科学

背景情况:

富含铁的吸附材料 (PSM) 对于将各种水源中的溶解 (P) 隔离至关重要.
在P去除结构中的自下而上的流动设计可能会导致由于停滞水的无氧条件,可能会影响铁 (Fe) P的结合能力.

研究的目的:

调查无氧条件对富含铁的PSM中结P溶性的影响.
在间歇无氧和恢复氧条件下评估PSM的P保留和P去除能力的稳定性.
评估富含铁的PSM和排水系统中无氧条件的发展.

主要方法:

使用三种类型的富含铁的PSM (酸性矿井排水残留物,铁涂,钢铁金属片) 的批量化研究.
在生物地球化学反应器中进行化,以诱导无氧条件 (Eh = -200 mV).
在无毒化之前和之后,通过流体实验来确定P去除能力.

主要成果:

在无毒条件下,在P处理和未处理的PSM样本中,溶解P度仍然很低,这表明P保持稳定.
经过无毒化和随后的再氧化后,测试PSM的P去除能力没有显著改变.
在化溶液中没有观察到潜在有害的微量金属的显著调动.

结论:

无毒条件不会显著影响Fe-bound P在富含Fe的PSM中的溶解.
富含铁的PSM的P去除效果即使在暴露于间歇性无氧条件和随后恢复氧气条件后也保持不变.
富含铁的PSM非常坚固,可用于自下而上流的P去除结构,即使可能出现暂时的无氧.

关键词:

无氧化化时间铁铁的减少去除结构可以去除.酸吸附是一种酸吸附方法.

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