海水环境下MICP的反应机理与影响因素  

Reaction mechanism and influencing factors of MICP in seawater environment

作　　者：王子玉 喻文晔 齐超楠 赵翔宇 WANG Ziyu;YU Wenye;QI Chaonan;ZHAO Xiangyu(College of Marine Science and Technology,Hainan Tropical Marine University,Sanya 572022,Hainan,P.R.China;Yazhou Bay Innovation Research Institute,Hainan Tropical Marine University,Sanya 572022,Hainan,P.R.China;College of Ecology and Environment,Hainan Tropical Marine University,Sanya 572022,Hainan,P.R.China)

机构地区：[1]海南热带海洋学院海洋科学技术学院,海南三亚572022 [2]海南热带海洋学院崖州湾创新研究院,海南三亚572022 [3]海南热带海洋学院生态环境学院,海南三亚572022

出　　处：《土木与环境工程学报（中英文）》2022年第5期128-135,共8页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(42162024);海南省自然科学基金(421RC592)。

摘　　要：为了探讨海水环境下微生物矿化反应过程与影响因素,在海水和去离子水环境下,通过改变营养盐浓度、菌液与营养盐体积比、环境温度等条件进行微生物诱导碳酸钙沉淀(Microbially Induced Carbonate Precipitation,MICP)水溶液试验,然后通过SEM、XRD和EDS测试对水溶液生成物进行检测,并推测海水环境下MICP的反应机理。结果表明:不同水环境条件下,营养盐浓度为1 mol/L、菌液与营养盐体积比为30∶120时,反应速率最快,且生成沉淀物质量最大;温度对于碳酸钙沉淀反应影响明显,与低温(4℃)条件相比,室温(25℃)下反应速率更大,且反应进行得较充分;海水环境水溶液试验中,高pH值可以加速反应的进行,同时,由于海水中存在Mg^(2+)、Ba^(2+)等离子,使得沉淀物中除CaCO_(3)外,还含有少量的碱式碳酸镁(Mg_(5)(CO_(3))_(4)(OH)_(2)·4H_(2)O)、BaCO_(3)等矿物成分。In order to explore the microbial mineralization reaction process and influencing factors in the seawater environment,the Microbially Induced Carbonate Precipitation(MICP)aqueous solution experiment was carried out by changing the concentration of nutrient salts,the volume ratio of bacterial solution to nutrient salts and environmental temperaturein seawater and deionized water.Then,SEM,XRD and EDS tests were used to detect the aqueous solution products,and the mechanism of MICP reaction in seawater environment was speculated.The results showed that:(1)under different water environment conditions,when the nutrient concentration was 1 mol/L and the volume ratio of bacterial liquid to nutrient was 30∶120,the reaction rate was the fastest and the sediment produced was the largest;(2)The effect of temperature on the precipitation reaction of calcium carbonate is obvious.The reaction rate at room temperature(25℃)is higher than that at low temperature(4℃),and the reaction is fully carried out.(3)In seawater aqueous solution test,high pH value can accelerate the reaction,and the presence of Mg^(2+),Ba^(2+)plasma in seawater makes the precipitate contain a small amount of basic magnesium carbonate(Mg_(5)(CO_(3))_(4)(OH)_(2)·4H_(2)O),BaCO_(3) and other mineral components in addition to CaCO3.

关 键 词：微生物诱导碳酸钙沉淀(MICP) 微生物 海水环境 碳酸钙 营养盐 加固土体 

分 类 号：TU441[建筑科学—岩土工程]