模拟微生物诱导的碳酸沉 (MICP) 对CO2捕获的影响
Raymond Chen1, Ahmet Mert Kavala2, Alexandra Clarà Saracho2
1Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, U.K.
Environmental science & technology
|October 2, 2025
概括
微生物诱导的碳酸沉增强了通过尿解的二氧化碳溶性捕获. 然而,它不会增加矿物捕获,并且可以在高pH下导致CO2排气.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 微生物学 微生物学
背景情况:
- 微生物诱导的碳酸沉 (MICP) 是一种拟议的二氧化碳封存方法.
- 现有的模型缺乏对反应动力学,酶活动和介质缓冲器的全面分析.
- 了解MICP在提高二氧化碳可溶性和矿物捕获方面的有效性至关重要.
研究的目的:
- 为MICP开发一个模型,考虑反应动力学,酶活动和缓冲器.
- 评估MICP在提高二氧化碳可溶性和矿物捕获方面的有效性.
- 确定二氧化碳封存中MICP的限制和最佳条件.
主要方法:
- 开发一种微生物诱导碳酸沉的综合模型.
- 模拟细菌尿素水解及其对pH值和碳酸离子溶解度的影响.
- 分析种植媒介缓冲对MICP过程的影响.
- 在各种条件下对二氧化碳溶解度和矿物捕获的建模.
主要成果:
- 尿溶解有效地增加了二氧化碳的溶解性捕获.
- 种植媒介的缓冲对MICP过程有很大的影响.
- 尿溶解产生的高pH值 (高于8.9) 会减少溶解物捕获,并导致二氧化碳排气.
- 由于pH升值不足,单靠MICP并没有增加模拟配置中的二氧化碳矿物捕获.
结论:
- MICP,特别是尿解,可以增强二氧化碳的溶解性捕获.
- MICP的有效性受到介质缓冲区和pH水平的影响.
- 当与自然沉积水库机制相结合时,MICP可能有助于长期的矿物捕获.
- 细菌碳酸酶酶在二氧化碳溶性捕获中发挥作用,作为矿物沉的中间步骤.
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