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从污水污泥中通过pH控制的微波处理溶解,以恢复维亚尼特

Haozhe Mo¹, Yifei Song², Muzhi Sha¹

¹Department of Environmental Science and Engineering, Guangdong Technion - Israel Institute of Technology, 241 Daxue Road, Shantou, Guangdong 515063, China; Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel.

|March 14, 2026

概括

这项研究使用pH调整和微波加热从污水污泥中回收. 性条件和长时间加热有效地使溶解,用于维亚尼特的回收,提供了经济有效的解决方案.

科学领域:

环境科学环境科学
化学工程是化学工程的重要组成部分.
材料科学材料科学材料科学

背景情况:

污水污泥是 (P) 的重要来源,这是农业的关键营养素.
有效的溶解对于从污泥中回收P作为有价值产品至关重要.
维维亚尼特 (Fe3(PO4) 2·8H2O) 是一种可从富含铁的污泥中回收的产物.

研究的目的:

为了研究pH调整和微波加热对废物活性污泥中的溶解的联合作用.
为了检查在处理过程中物种化的转化.
评估从处理的污泥上游物中回收维亚尼特的可行性.

主要方法:

测序提取和31P核磁共振 (NMR) 光谱被用来分析物种.
废弃活性污泥经过不同pH值 (酸性,中性,性) 和微波加热时间 (5分钟,15分钟) 的处理.
评估了释放效率和污泥脱水能力.

主要成果:

性处理 (pH 12) 显著释放,主要来自Fe-bound P和非反应性P (nrP).
在pH12下微波加热 (15分钟) 将溶解度提高到52%,改善了污泥脱水能力.
在微波加热15分钟以pH12处理后,90%的酸盐被恢复为vivianite.

结论:

结合性pH调整和微波加热的成本效益高的策略,可以有效地从污水污泥中恢复作为维亚尼特.
这种方法特别适用于使用Fe剂量和活性污泥工艺的废水处理厂的污泥.
需要进一步优化,以实现nrP的完全水解和增强vivianite纯度.

关键词:

关于P的循环经济.P 提取 P 提取 P 种类的形成.热化学处理是一种热化学处理.维维安石结晶的过程废弃的活性污泥废弃物

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