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Environmental investigation of bio-modification of steel slag through microbially induced carbonate precipitation

Journal of Environmental Sciences 2021年第3期33卷 282-292页

作者： Junke Zhang Peidong Su Yadong Li Lin Li Department of Civil and Environmental Engineering Jackson State UniversityJacksonMS 39217United States Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental ScienceChinese Academy of SciencesBeijing 100085China Department of Civil and Architectural Engineering Tennessee State UniversityNashvilleTN 37209United States

Steel slag(SS)is one of byproduct of steel manufacture *** environmental concerns of SS may limit their re-use in different *** goal of this study was to investigate the leaching behavior of metals from SS before and after treated by microbially induced carbonate precipitation(MICP).Toxicity characteristic leaching procedure,synthetic precipitation leaching procedure and water leaching tests were performed to evaluate the leaching behavior of major elements(Fe,Mg and Ca)and trace elements(Ba,Cu and Mn)in three *** concentrations of leaching metals increased with the content of *** it reached the peak concentration,the leaching concentration decreased with the content of *** leachability of all elements concerned in this study was below 0.5%.The carbonate generated from the MICP process contributed to the low leachability of *** bio-modified by MICP process,the leaching concentrations of Ba from TCLP,SPLP and WLT tests were below 2.0 mg/L,which was the limit in drinking water regulated by *** concentrations of Cu leached out from MICP-treated SS-sand samples were below 1.3 mg/L which is the limit regulated by national secondary drinking *** with the regulations of *** and Mississippi Department of Environment Quality(MDEQ),MICP-treated samples were classified as non-hazardous materials with respects to the leaching of ***,maximum contaminant limits regulated by *** states that MICP-treated SS are eco-friendly materials that can be reused as construction materials.

关键词： Biomodification microbially-induced carbonate precipitation Metal leaching behavior Bioleaching Pearson correlation

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Experimental study on permeability and strength characteristics of MICP-treated calcareous sand

Biogeotechnics

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Biogeotechnics 2023年第3期1卷 8-17页

作者： Yumin Chen Yi Han Xinlei Zhang Saeed Sarajpoor Shuhang Zhang Xiaofei Yao College of Civil Engineering and Transportation Hohai UniversityNanjing 210098JiangsuChina Research Center of Urban Underground Space Nanjing Tech UniversityNanjing 211816China Institute for small city of Chongqing University in Liyang Chongqing UniversityJiangsu 213300China Yancheng Traffic Planning and Design Institute Yancheng 224001China

Calcareous sand is the main fill material for island reclamation projects,but untreated calcareous sand might not be used as a reclamation fill due to its poor mechanical *** induced calcite precipitation(MICP)was directly used to consolidate calcareous ***-dimensional sand column tests were conducted to identify the optimized solutions and to investigate the effects of cement solution concentration,relative density,and consolidation frequencies on the permeability and mechanical properties of MICP-treated calcareous ***,three-dimensional model tests were carried out to investigate the effective consolidation range of microbially treated calcareous *** results show that the MICP-treated calcareous sand shows a reduction in the permeability of the sample,while the calcium carbonate cementation and its filling effect improves the mechanical properties of the *** one-dimentional test results show that the effective values for cement solution concentration,relative density,and consolidation frequencies range from 0.5 mol/L to 1.5 mol/L,30%-70%,and 5-15 *** consolidation frequencies have the greatest influence on the permeability and strength properties of the treated calcareous sand.A quadratic polynomial regression model for permeability and strength was established through response surface analysis,and the regression model proved to be highly accurate and reliable through *** three-dimentional tests,the consolidation range tends to move downwards in a trapezoidal shape,showing a"big bottom and small top"pattern,with a consolidation range of approximately 34 times the diameter of the *** study serves as a reference for selecting consolidation parameters for subsequent tests and applications of MICP-treated calcareous sands.

关键词： microbially-induced carbonate precipitation (MICP) Calcareous sand Mechanical properties Permeability

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