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硫化度对生物固体泥固体和溶液化学的影响,用于回收和再利用

Sarah Bluteau¹, Sidney Omelon¹

¹Department of Mining and Materials Engineering, McGill University, 3610 University Street, Montreal, Quebec, H3A 0C5, Canada.

Journal of environmental management

|October 28, 2023

概括

将硫化添加到市政生物固体中有效地溶解无机正酸盐 (o-Pi) 以回收 (P). 然而,这种方法带来了诸如建筑材料腐蚀和降低P回收效率等挑战.

科学领域:

环境工程环境工程
水处理处理水的方法
资源恢复资源回收资源回收

背景情况:

市政生物固体含有有价值的 (P),可以回收用于肥料再利用.
生物固体中的无机 (P),特别是铁酸盐,通常具有较低的可溶性,阻碍恢复.
现有的P回收策略旨在最大限度地使生物固体中的无机正酸盐 (o-Pi) 溶解.

研究的目的:

评估硫化添加剂在从城市生物固体中溶解无机正酸盐 (o-Pi) 的有效性.
为了研究不同硫化物对总 (S2−/TP) 摩尔比对o-Pi溶液的影响.
评估温度和化时间对o-Pi溶解过程的影响.

主要方法:

生物固体泥 (10% w/w) 的总 (TP) 值为0.97 ± 0.03 mmol P/ dry g,经过硫化处理.
硫化物与TP (S2−/TP) 的摩尔比率从0到4不等,在室温下化时间长达96小时.
铁度用色度测量,矿物学变化用X射线衍射和FTIR分析.

主要成果:

在24小时后,最大的o-Pi度 (48 ± 7mM,42 ± 6%的TP) 达到,S2−/TP比为4.
添加硫化物 (S2−/TP > 1) 显著降低了铁度,从0.6 ± 0.1 mM降至<0.01 mM.
硫化物处理优先溶解无形O-Pi固体,维亚尼特和其他含铁矿物质,在较高的比例下形成埃尔迪特.
化温度 (室温与37°C相比) 和时间并没有显著影响o-Pi度.

结论:

硫化有效地从生物固体中溶解无机正酸盐,增强的回收潜力.
这一过程降低了铁含量,但可能导致形成不那么理想的矿物质,如地.
潜在的缺点包括建筑材料腐蚀的风险增加和降雨导致的整体P回收效率降低.

关键词:

厌氧生物固体是一种无氧生物固体.埃尔代特石是世界上最重要的石头.铁酸盐是一种铁酸盐.的回收使用方法硫化硫化物是一种硫化物.

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