释放和回收通过从模拟废水中减少化学沉的溶解
Aseel A Alnimer1, D Scott Smith1, Wayne J Parker2
1Department of Chemistry and Biochemistry, Wilfrid Laurier University, 75 University Ave. W., Waterloo, N2L 3C5, ON, Canada.
Chemosphere
|October 22, 2023
概括
这项研究探讨了利用酸 (AA) 来从废水污泥中回收 (P),以进行还原性溶解. 最佳条件产生了高P和铁回收作为vivianite,提高了废水处理的可持续性.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 资源恢复 资源回收 资源回收
背景情况:
- 废水处理中的化学除 (CPR) 会产生铁 (Fe-P) 污泥.
- 可持续的废水管理需要有效地从这些污泥中回收 (P).
- 维维亚尼特 (Fe3P2O8·8H2O) 是Fe-P污泥中的一个潜在的P回收产品.
研究的目的:
- 通过使用 Askorbic 酸 (AA) 来研究从合成 Fe-P 污泥中直接释放和回收 P.
- 为了确定最佳条件 (AA/Fe比率,污泥年龄,pH) 进行还原溶解和vivianite沉.
- 为了比较AA与其他剂 (氧胺,酸,无机酸) 对于P和Fe溶解的有效性.
主要方法:
- 合成Fe-P污泥在酸性条件下使用亚斯科布酸进行减少溶解.
- 评估不同的AA/Fe摩尔比率 (1:2, 1:4),污泥年龄 (长达11天) 和pH值 (3, 4).
- 与氧胺,酸和无机酸 (HNO3,HCl,H2SO4) 进行对P和Fe释放的比较分析.
- 在污泥溶解后,通过将pH调整到7的方法恢复vivianite.
- 采用X射线衍射 (XRD),Fe/P摩尔比率分析和磁吸引力对回收的维亚尼特进行了表征.
- PHREEQC建模模拟P和Fe的释放和维维安的形成.
主要成果:
- 亚酸在pH 3和4下实现了完全的Fe-P污泥溶解和Fe3+降解,Fe/AA比为1:2和1:4.
- 污泥年龄并没有显著影响AA的减少溶解.
- 氧化酸通过在pH3和Fe/氧化酸比为1:2的非还原性溶解实现了高P (95±2%) 和Fe3+ (90±1%) 溶解.
- 在pH 3时,无机酸的P和Fe释放量最小 (<10%).
- 在AA处理后以后的pH调整到7后,使P (88±2%) 和Fe (90±1%) 恢复为vivianite.
- XRD,Fe/P比率和磁性测试证实了维维亚尼特的形成.
结论:
- 亚斯科布酸有效地减少Fe-P污泥的溶解,促进随后的P和Fe恢复为维维亚尼特.
- 这种方法提供了一种可持续的方法,用于从废水处理污泥中回收.
- 这些发现支持化学媒介维亚尼特回收的潜力,以提高废水处理的可持续性.
关键词:
亚斯科布酸是一种亚斯科布酸.化剂是一种化剂.通过化学介导去除.地化学建模地质化学建模是一种的物质.的回收使用方法减少性溶解是一种减少性溶解.维维亚尼特是一种维维亚尼特.废水是废水,废水就是废水.更多相关视频
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