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从市政污泥中提取的酸回收:对漏机制和酸合成的洞察

Huan Liu¹, Nathalie Lyczko², Ange Nzihou³

¹UBC Bioreactor Technology Group, School of Engineering, The University of British Columbia, Okanagan Campus, 1137 Alumni Avenue, Kelowna, British Columbia V1V 1V7, Canada.

|June 2, 2023

概括

这项研究优化了利用酸从污水泥中回收 (P) 的条件. 在最佳的提取条件下,可以获得近100%的P回收,产生一种有价值的肥料前体.

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.
资源恢复资源回收资源回收

背景情况:

市政污水污泥是一个重要的废物流,具有资源回收的潜力.
水热液化 (HTL) 将污泥中的有机物转化为生物原料,并在固体中缩 (P),促进P的回收.
从炭中有效地回收P对于可持续的废水管理和营养物质回收至关重要.

研究的目的:

为了优化酸提取条件,从污水污泥中释放和金属.
为了研究酸性正常性,液体/固体比率,接触时间和pH对P和金属浸出的影响.
为了确定P回收和随后降水的最佳条件,用于肥料生产.

主要方法:

系统评估各种酸提取参数,包括酸正常度 (0.02-1 N),液体/固体比率 (5-100 mL/g) 和接触时间 (0-24 h).
对酸盐pH (<1.5) 在实现完全P提取中的占主导作用的分析.
收缩核心模型的应用,以确定P和金属漏机制作为产品层扩散.

主要成果:

最佳的提取条件是0.6 N HNO3,液体/固体比为10mL/g,接触时间为2h,达到近100%的P浸出.
化pH值是P出的主要因素,pH值<1.5对于完全提取至关重要.
提取后,加氧化在pH 5-6下沉了99-100%的P,产生了植物可用的肥料前体,重金属度可接受.

结论:

为了有效地从炭中回收,建立了可重复的过程.
该研究表明,从废水污泥中回收P的可行途径,有助于循环经济和废水生物炼油概念.
回收的P沉物具有很高的植物可用性,适用于加拿大和美国的肥料.

关键词:

炭化水化合物是一种碳化水化合物.水热液化液化的方法氧亚帕提特是一种氧亚帕提特.的回收使用方法污水污泥的污水污泥是污水中的污泥.湿化学提取方法湿化学提取方法

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