The effect of enrichment media on the stimulation of native ureolytic bacteria in calcareous sand

Wang, Y.-J.; Han, Xiao-Le; Jiang, Ning‐Jun; Wang, J.; Feng, Jimeng

doi:10.1007/s13762-019-02541-x

Cited by 34 publications

(11 citation statements)

References 54 publications

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“…For bio‐stimulation, the enrichment media play a similar role to the culture media for bio‐augmentation, which enriches the indigenous ureolytic bacteria and sustains the enzymatic activity (Wang et al, 2020a). Unlike bio‐augmentation, the indigenous bacteria cannot reach the desired ureolytic rate immediately after injection.…”

Section: Materials For Micpmentioning

confidence: 99%

Bio‐mediated soil improvement: An introspection into processes, materials, characterization and applications

Jiang

Wang

Chu

et al. 2021

Soil Use and Management

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For a long time in the practice of geotechnical engineering, soil has been viewed as an inert material, comprising only inorganic phases. However, microorganisms including bacteria, archaea and eukaryotes are ubiquitous in soil and have the capacity and capability to alter bio‐geochemical processes in the local soil environment. The cumulative changes could consequently modify the physical, mechanical, conductive and chemical properties of the bulk soil matrix. In recent years, the topic of bio‐mediated geotechnics has gained momentum in the scientific literature. It involves the manipulation of various bio‐geochemical soil processes to improve soil engineering performance. In particular, the process of microbial‐induced calcium carbonate precipitation (MICP) has received the most attention for its superior performance for soil improvement. The present work aims to shape a comprehensive understanding of recent developments in bio‐mediated geotechnics, with a focus on MICP. Referring to around one hundred studies published over the past five years, this review focuses on popular and alternative MICP processes, innovative raw materials and additives for MICP, emerging tools and testing methodologies for characterizing MICP at multi‐scale, and applications in emerging and/or unconventional geotechnical fields.

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Section: Materials For Micpmentioning

confidence: 99%

Bio‐mediated soil improvement: An introspection into processes, materials, characterization and applications

Jiang

Wang

Chu

et al. 2021

Soil Use and Management

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“…Due to the scarcity of land resources in China's coastal provinces and the strict protection systems currently applied to cultivated land, local governments have adopted coastal reclamation for providing alternative solutions. In recent years, due to the rapid development of China's economy, the country's coastal reclamation demand has exceeded 5,880 km 2 , nearly half of the total coastal area reclaimed over the past 50 years (Wei et al, 2015). The main engineering problems encountered during coastal reclamation include site selection, acquisition and transportation of fillings and foundation treatment.…”

Section: Open Access Edited Bymentioning

confidence: 99%

Reinforcement of reclaimed sand by stimulating native microorganisms for biomineralization

Liu

Sui

Dong

2022

Front. Bioeng. Biotechnol.

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The method of biological stimulation to reinforce soil has good environmental benefits. The optimization of stimulation solutions can not only improve soil reinforcement but also effectively reduce treatment costs. Response surface methodology was used to optimize a biostimulation solution to reinforce reclaimed sand by native microorganism-induced mineralization. First, response surface methodology was used to obtain the optimal stimulation solution. Then, the effect of the optimal stimulation solution in inducing mineralization to reinforce reclaimed sand was evaluated. Finally, the reinforcement mechanism was revealed by SEM, XRD, and microbial diversity analysis. The results showed that the urease activity of the sample optimized by response surface methodology was 1.17 times higher than that of the sample treated with the initial stimulation solution. The uniaxial compressive strength of samples treated with the optimal biostimulation solution and 1.0 M cementation solution over 15 cycles reached 3.94 MPa. The product of microbial mineralization was calcite, which was the main substance responsible for the improvement in the mechanical properties of the reclaimed sand. The concentration of the cementation solution not only affected the production of calcium carbonate but also affected the morphology of calcium carbonate crystals. After sample treatment with the stimulation solution, ureolytic microorganisms became the dominant bacteria in the sample. A comprehensive assessment of the reinforcement effect and cost revealed that using the optimal stimulation solution and 1.0 M cementation solution over 10 cycles was ideal for reinforcing reclaimed sand. Biostimulation is an effective method to reinforce reclaimed sand; however, the actual application effect requires further examination.

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“…The greater the urease activity of urease-producing bacteria, the better its effect in solidifying sand. Wang et al [95] screened urea-producing bacteria from beach sand and studied the effects of different media and urea concentrations on bacterial urease activity. The experiment results showed that nitrogen-rich composite media such as YE and NB increase bacterial urease activity, and urease activity at 100 mM concentration is highly efficient.…”

Section: Solidification Of Sandy Soil By Indigenous Bacteriamentioning

confidence: 99%

Critical Review of Solidification of Sandy Soil by Microbially Induced Carbonate Precipitation (MICP)

et al. 2021

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Microbially induced carbonate precipitation (MICP) is a promising technology for solidifying sandy soil, ground improvement, repairing concrete cracks, and remediation of polluted land. By solidifying sand into soil capable of growing shrubs, MICP can facilitate peak and neutralization of CO2 emissions because each square meter of shrub can absorb 253.1 grams of CO2 per year. In this paper, based on the critical review of the microbial sources of solidified sandy soil, models used to predict the process of sand solidification and factors controlling the MICP process, current problems in microbial sand solidification are analyzed and future research directions, ideas and suggestions for the further study and application of MICP are provided. The following topics are considered worthy of study: (1) MICP methods for evenly distributing CaCO3 deposit; (2) minimizing NH4+ production during MICP; (3) mixed fermentation and interaction of internal and exogenous urea-producing bacteria; (4) MICP technology for field application under harsh conditions; (5) a hybrid solidification method by combining MICP with traditional sand barrier and chemical sand consolidation; and (6) numerical model to simulate the erosion resistance of sand treated by MICP.

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The effect of enrichment media on the stimulation of native ureolytic bacteria in calcareous sand

Cited by 34 publications

References 54 publications

Bio‐mediated soil improvement: An introspection into processes, materials, characterization and applications

Bio‐mediated soil improvement: An introspection into processes, materials, characterization and applications

Reinforcement of reclaimed sand by stimulating native microorganisms for biomineralization

Critical Review of Solidification of Sandy Soil by Microbially Induced Carbonate Precipitation (MICP)

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