加速微生物诱导碳酸盐沉淀过程的调控因子筛选及机理初步研究  

Screening and Preliminary Mechanism Study on Regulatory Factors for Accelerating the Microbial-induced Carbonate Precipitation Process

作　　者：陈敏洁 曹丹 李博文 庞浩 武小燕 郑春丽[2,3] CHEN Minjie;CAO Dan;LI Bowen;PANG Hao;WU Xiaoyan;ZHENG Chunli(College of Life Science and Technology,Inner Mongolia University of Science and Technology,Baotou 014010,China;College of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Resource and Environmental Engineering,Shanghai Second Institute of Technology,Shanghai 201209,China)

机构地区：[1]内蒙古科技大学生命科学与技术学院,内蒙古包头014010 [2]内蒙古科技大学能源与环境学院,内蒙古包头014010 [3]上海第二工业大学资源与环境工程学院,上海201209

出　　处：《有色金属工程》2023年第5期152-160,共9页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(41867061);国家重点研发计划项目(2018YFC1802904);内蒙古科技成果转化专项资金资助项目(2019CG062);内蒙古自然科学基金资助项目(2021MS05033)。

摘　　要：微生物诱导碳酸盐沉淀(MICP)技术被广泛应用于土壤重金属污染控制中,然而,土壤的成分会降低碳酸钙成核速率,为解决其矿化过程成核慢、矿化产物晶型不稳定等问题,选取六种调控因子:柠檬酸钠(C_(6)H_(5)Na_(3)O_(7))、氧化镁(MgO)、氯化镁(MgCl_(2))、壳聚糖((C6H11NO4)n)、乙醇(C_(2)H_(5)OH)和二氧化硅(SiO_(2)),利用偏振光显微镜、扫描电子显微镜(SEM)、X射线衍射(XRD)及傅里叶红外光谱(FTIR)等测试手段和方法,筛选出能够加速结晶且生成沉淀量最多,对铅的去除率达到90%的调控因子柠檬酸钠(TKa)。结果表明,柠檬酸钠能稳定球霰石,加快矿化过程和增加矿化沉淀,提高重金属去除率。因此,柠檬酸钠具有提高MICP生物修复的速度,对提高MICP技术应用的效率具有重要意义。Microbially Induced Carbonate Precipitation(MICP)technology is widely used in the control of soil heavy metal pollution.However,the composition of the soil can reduce the nucleation rate of calcium carbonate,in order to solve the problems of slow nucleation during its mineralization and unstable crystalline form of mineralization products.In this study,six regulatory factors were selected:sodium citrate(C_(6)H_(5)Na_(3)O_(7)),magnesium oxide(MgO),magnesium chloride(MgCl_(2)),chitosan((C6H11NO4)n),ethanol(C_(2)H_(5)OH)and silicon dioxide(SiO_(2)).The results showed that sodium citrate(TKa)was able to accelerate the crystallization and produce the highest amount of precipitation,and the removal rate of lead reached 90%.The results showed that sodium citrate stabilized the sphalerite,accelerated the mineralisation process and increased the mineralisation precipitation to improve the removal of heavy metals.Therefore,sodium citrate has the ability to increase the rate of MICP bioremediation,which is important for improving the efficiency of MICP technology application.

关 键 词：微生物诱导的碳酸钙沉淀(MICP) 成核 柠檬酸钠 CaCO_(3) 重金属 

分 类 号：X75[环境科学与工程—环境工程]