Investigating the Dissolution Behavior of Calcium Carbonate Bio-Cemented Sands
Investigating the Dissolution Behavior of Calcium Carbonate Bio-Cemented Sands
复制标题
研究碳酸钙生物胶结砂的溶解行为
DOI：
10.1061/9780784484012.040
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Gomez, Michael G.
中科院分区：
文献类型：
--
作者：
Ribeiro, Bruna G.;Gomez, Michael G.
微生物诱导方解石沉淀（Microbially Induced Calcite Precipitation，MICP）是一种生物介导的胶结过程，它利用微生物的酶活性催化CaCO3矿物在土壤颗粒表面和接触面上的沉淀。广泛的研究集中在了解MICP处理土壤的各个方面，包括土壤行为增强和过程反应化学，然而，几乎没有研究探索生物胶结地质材料的持久性。随着技术的成熟，更好地了解生物胶结改良土壤的寿命对于确定有利的现场应用，量化环境影响以及了解其长期性能至关重要。在这项研究中，一系列的批实验进行了调查的溶解动力学的碳酸钙基生物胶结砂的具体目标，将这些行为纳入地球化学模型。所有批次实验涉及以前的生物胶结不良级配砂，暴露于不同的溶解处理，旨在探索作为酸类型，浓度，初始pH值和其他因素的函数的CaCO3溶解的幅度和速率。在实验过程中，溶液pH值和钙浓度的变化指示碳酸钙溶解进行了监测。实验后，将水性测量与使用两种不同溶解动力学框架模拟的测量进行比较。虽然不是详尽的，这些实验的结果表明，生物胶结的溶解行为可以很好地近似使用现有的化学控制的动力学模型，特别是当周围的解决方案是更强的缓冲。
Microbially Induced Calcite Precipitation (MICP) is a bio-mediated cementation process that uses microbial enzymatic activity to catalyze the precipitation of CaCO3minerals on soil particle surfaces and contacts. Extensive research has focused on understanding various aspects of MICP-treated soils including soil behavioral enhancements and process reaction chemistry, however, almost no research has explored the permanence of bio-cemented geomaterials. As the technology matures, an improved understanding of the longevity of bio-cementation improved soils will be critical towards identifying favorable field applications, quantifying environmental impacts, and understanding their long-term performance. In this study, a series of batch experiments were performed to investigate the dissolution kinetics of CaCO3-based bio-cemented sands with the specific aim of incorporating these behaviors into geochemical models. All batch experiments involved previously bio-cemented poorly graded sands that were exposed to different dissolution treatments intended to explore the magnitude and rate of CaCO3dissolution as a function of acid type, concentration, initial pH, and other factors. During experiments, changes in solution pH and calcium concentrations indicative of CaCO3dissolution were monitored. After experiments, aqueous measurements were compared to those simulated using two different dissolution kinetic frameworks. While not exhaustive, the results of these experiments suggest that the dissolution behavior of bio-cementation can be well-approximated using existing chemically controlled kinetic models, particularly when surrounding solutions are more strongly buffered.
登录
查看更多内容
研究刺激尿素分解微生物诱导方解石沉淀后铵副产物的去除
DOI：
--
发表时间：
2019
期刊：
Geo-Congress 2019
影响因子：
--
作者：
Minyong Lee;Colin M. Kolbus;Andres Yepez;M. G. Gomez
通讯作者：
M. G. Gomez
影响因子：
4.5
作者：
M. Gehlen;Franck Bassinot;L. Chou;D. McCorkle
通讯作者：
D. McCorkle
影响因子：
4.6
作者：
Gomez, Michael G.;Graddy, Charles M. R.;Nelson, Douglas C.
通讯作者：
Nelson, Douglas C.
DOI：
--
发表时间：
1978
期刊：
--
影响因子：
--
作者：
E. Sjöberg
通讯作者：
E. Sjöberg
碳酸钙在海水中的溶解动力学；
影响因子：
2.9
作者：
J. Morse;R. Berner
通讯作者：
R. Berner