从石灰稳定到二氧化碳捕获:城市污水污泥中的自发再碳化
Felix Brück1, Florian Schmutzler1, Jan Reeh2
1THM University of Applied Sciences, Centre of Competence for Sustainable Engineering and Environmental Systems (ZEuUS), Wiesenstr. 14, D-35390 Gießen, Germany.
Waste management (New York, N.Y.)
|January 30, 2026
概括
污水污泥的石灰处理可以通过自发的再碳化来促进二氧化碳的捕获. 速度和程度取决于石灰类型和应用,为废水处理中的碳核算提供了潜力.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 市政污水污泥处理通常使用石灰来稳定和改善处理.
- 石灰处理为通过自发再碳化来捕获二氧化碳 (CO2) 提供了一个机会,其中大气中的CO2与氧化 (Ca(OH) 2反应,形成碳酸 (CaCO3).
- 这种二氧化碳吸收的程度和速度尚不清楚.
研究的目的:
- 为了研究石灰处理的污水污泥的自发再碳化.
- 量化二氧化碳封存潜力,并确定影响再碳化过程的因素.
主要方法:
- 来自两家大型废水处理厂 (WWTP) 的处理污水泥样本的分析,采用不同的应用方法 (化前脱水 vs 热后脱水).
- 在受控条件下化样品六个月.
- 使用热重力测量-质谱测量 (TGA-MS),X射线衍射 (XRD) 和散装元素分析进行表征.
主要成果:
- 通过将Ca(OH) 2转化为CaCO3.3,确认了自发的再碳化.
- 在4个月内观察到,在脱水之前用水合石灰处理的污泥 (WWTP1) 几乎完全碳化 (接近与化相关的CO2排放的100%).
- 对于经过脱水后用热处理的污泥 (WWTP2) 观察到较低的再碳化率 (最大~94%) ,这归因于异质的分布,封装和质量差异.
结论:
- 在环境条件下,石灰处理的污水污泥发生了大量的自发再碳化.
- 二氧化碳的吸收受到使用的石灰类型,应用策略和污泥特征的重大影响.
- 这些发现支持将石灰再碳化纳入碳计量和评估经过处理的污泥的长期碳沉积潜力.
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