医疗废物焚烧飞灰基酸酸水泥:用强化固化/稳定机制和优化碳减排过程战略
Runjie Liu1, Shiwei Liu1, Shichang Sun1
1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
Journal of environmental management
|March 29, 2024
概括
酸水泥 (MKPC) 为医疗废物飞灰处理提供了低碳的解决方案,有效地固定化物和重金属. 与传统方法相比,这种策略可以显著减少碳排放.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 传统的普通波特兰水泥 (OPC) 用于固化/稳定 (S/S) 面临着耐和高碳排放的挑战.
- 医疗废物焚烧飞灰 (MFA) 需要有效的处理方法来减轻环境风险.
研究的目的:
- 开发一个低碳的S/S战略,用于使用酸水泥 (MKPC) 处理MFA.
- 评估MKPC在从MFA中固定化物和重金属的效率.
- 评估与基于MKPC的S/S工艺相关的潜在碳排放.
主要方法:
- 在现场使用X射线衍射 (XRD) 来分析化物不移动机制.
- 对MKPC-MFA复合材料进行了压力强度测试.
- 量化了重金属固定率的数量.
- 进行了生命周期评估 (LCA),以评估碳排放.
主要成果:
- 通过形成稳定的Ca5(PO4) 3Cl.Cl,MKPC有效地固定了高达77.29%的化物离子 (Cl-).
- MKPC-MFA复合材料实现了39.6MPa的压力强度和>90%的重金属固定.
- 增加MFA整合降低了S/S业绩,但显著降低了潜在的碳排放.
- 在混合平衡点 (17.68重量%MFA),碳排放量为8.35 × 10^2公斤CO2-eq,Cl-不动化>65%.
结论:
- MKPC为MFA S/S提供了一个可行的低碳替代OPC,平衡稳定和减少环境影响.
- 稳定的酸化合物的形成是有效的化物不动化的关键.
- 这项研究为设计用于危险废物管理的可持续S/S材料提供了一个框架.
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