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在减轻重金属污染方面,电化学路径优于化学 struvite 沉

Runhua Wang¹, Zhengshuo Zhan¹, Bingnan Song¹

¹Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.

Journal of hazardous materials

|January 6, 2024

概括

电化学介导的 struvite 沉 (EMSP) 通过将其从铜等重金属中分离出来,从废水中回收更清洁的 struvite. 与传统的化学沉相比,这种无化学方法提供了更安全的产品.

科学领域:

环境化学环境化学
废水处理废水处理
材料科学材料科学材料科学

背景情况:

富含营养的废水,如猪废水,含有宝贵的资源,如酸盐和.
斯特鲁维特沉是一种回收这些营养的方法,但重金属污染是一个重大挑战.
在回收的 struvite 中的重金属污染可能会限制其安全的再利用.

研究的目的:

为了研究铜离子 (Cu2+) 在电化学介导的 struvite 沉 (EMSP) 的行为.
为了比较由EMSP产生的 struvite 中的重金属污染程度与传统的化学 struvite 沉 (CSP).
评估使用EMSP. 单独回收 struvite 和重金属的潜力.

主要方法:

在EMSP和CSP系统中对Cu2+命运进行系统的调查.
有控制的实验改变了初始pH和Cu2+度.
分析固态产品以确定 struvite 和铜的组成和位置.
两种方法之间的产品纯度和回收效率的比较.

主要成果:

在CSP中,Cu²⁺作为与斯特鲁维特的混合物被完全纳入固态阶段.
在pH值为7.5.5的回收斯特鲁维特中,EMSP导致Cu2+污染 (24.4%) 显著减少.
斯特鲁维特主要形成于阴极的前面,而Cu2+则以铜 (水) 氧化物形式沉积在EMSP的后面.
在EMSP系统中,已经证明了 struvite 和铜化合物的分开采集.

结论:

在营养恢复过程中,EMSP在减轻重金属污染方面优于CSP.
在EMSP中局部化的pH梯度使得斯特鲁维特和重金属的空间分离成为可能.
EMSP技术促进了更清洁的结构回收,并促进了废水中宝贵资源的单独回收.

关键词:

氨的含量是多少?氨的含量是多少?铜离子铜离子铜离子共同沉降是一种共同沉降.猪的废水是猪的废水.它们的pH值为pH.

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