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在不同的热处理后从污水污泥中回收的实际策略:洞察的转化过程

Ruichi Zhang¹, Huan Liu², Essi Sariola-Leikas¹

¹Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 8, 33720 Tampere, Finland.

|April 3, 2024

概括

从污水污泥中回收 (P) 对循环经济至关重要. 热处理如水热碳化和热解将SS转化为有价值的产品,在风险评估后,炭 (HC) 和生物炭 (BC) 显示出农业潜力.

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.
土壤科学土壤科学

背景情况:

全球短缺需要有效地回收废物流.
污水污泥 (SS) 是用于肥料生产的 (P) 的潜在来源.
从热处理的SS中缺少已确立的P回收路径.

研究的目的:

研究和比较SS及其热衍生物的物理化学性质.
探索在热处理过程中的物种化和转化.
提出有效的废水污泥P回收路径.

主要方法:

炭 (HC),生物炭 (BC),污水污泥灰 (SSA),炭灰 (HCA) 和生物炭灰 (BCA) 的比较.
使用水热碳化 (180240°C),热解 (400600°C) 和燃烧 (850°C) 的方法.
分析P的分化和转化,以及物理化学性质.

主要成果:

热处理分解有机P,并将非酸性P转化为酸性P;正酸-P占主导地位.
物理化学性质随热处理而显著变化,影响了P回收的可行性.
灰产品含有高有害金属含量,不适合农业使用;对于非FeP产品,酸是可行的.

结论:

水炭 (HC) 和生物炭 (BC) 显示出农业应用的潜力,但需要进行风险评估.
酸性液对于从热残留物中合成非FeP产品是有效的.
热处理为P回收和污泥利用提供了多功能途径.

关键词:

营养物质的回收利用的转换是的转换.污水污泥的污水污泥是污水中的污泥.热处理是一种热处理.

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.