Chuo Sing Chuong, Mohamed Sarajul Fikri, Mohd Setapar Siti Hamidah, Ahmad Akil, Jawaid Mohammad, Wani Waseem A, Yaqoob Asim Ali, Mohamad Ibrahim Mohamad Nasir
Centre of Lipids Engineering and Applied Research, Universiti Teknologi Malaysia, Skudai 81310 UTM, Johor, Malaysia.
Department of Quantity Surveying, Faculty of Built Environment, Universiti Teknologi Malaysia, Skudai 81310 UTM, Johor, Malaysia.
Materials (Basel). 2020 Nov 5;13(21):4993. doi: 10.3390/ma13214993.
Nowadays, microbially induced calcium carbonate precipitation (MICP) has received great attention for its potential in construction and geotechnical applications. This technique has been used in biocementation of sand, consolidation of soil, production of self-healing concrete or mortar, and removal of heavy metal ions from water. The products of MICP often have enhanced strength, durability, and self-healing ability. Utilization of the MICP technique can also increase sustainability, especially in the construction industry where a huge portion of the materials used is not sustainable. The presence of bacteria is essential for MICP to occur. Bacteria promote the conversion of suitable compounds into carbonate ions, change the microenvironment to favor precipitation of calcium carbonate, and act as precipitation sites for calcium carbonate crystals. Many bacteria have been discovered and tested for MICP potential. This paper reviews the bacteria used for MICP in some of the most recent studies. Bacteria that can cause MICP include ureolytic bacteria, non-ureolytic bacteria, cyanobacteria, nitrate reducing bacteria, and sulfate reducing bacteria. The most studied bacterium for MICP over the years is . Other bacteria from Bacillus species are also frequently investigated. Several factors that affect MICP performance are bacterial strain, bacterial concentration, nutrient concentration, calcium source concentration, addition of other substances, and methods to distribute bacteria. Several suggestions for future studies such as CO sequestration through MICP, cost reduction by using plant or animal wastes as media, and genetic modification of bacteria to enhance MICP have been put forward.
如今，微生物诱导碳酸钙沉淀（MICP）因其在建筑和岩土工程应用中的潜力而备受关注。该技术已用于砂土的生物胶结、土壤加固、自愈合混凝土或砂浆的生产以及从水中去除重金属离子。MICP的产物通常具有更高的强度、耐久性和自愈合能力。MICP技术的应用还可以提高可持续性，特别是在建筑行业，其中使用的很大一部分材料是不可持续的。细菌的存在对于MICP的发生至关重要。细菌促进合适的化合物转化为碳酸根离子，改变微环境以利于碳酸钙沉淀，并作为碳酸钙晶体的沉淀位点。许多细菌已被发现并测试其MICP潜力。本文综述了一些最新研究中用于MICP的细菌。能够引起MICP的细菌包括尿素分解菌、非尿素分解菌、蓝细菌、硝酸盐还原菌和硫酸盐还原菌。多年来，研究最多的用于MICP的细菌是 。芽孢杆菌属的其他细菌也经常被研究。影响MICP性能的几个因素包括细菌菌株、细菌浓度、营养物浓度、钙源浓度、其他物质的添加以及细菌分布方法。还提出了一些未来研究的建议，例如通过MICP进行碳封存、使用植物或动物废物作为介质降低成本以及对细菌进行基因改造以增强MICP。
