Microbial induced solidification and stabilization of municipal solid waste incineration fly ash with high alkalinity and heavy metal toxicity

Chen, Ping; Hao, Zhengping; Xu, Hui; Gao, Yanxu; Ding, Xueqin; Ma, Mei-ling

doi:10.1371/journal.pone.0223900

Cited by 30 publications

(13 citation statements)

References 49 publications

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“…This environmentally friendly process utilises a microbial metabolic activity that involves inorganic mineral precipitation (calcite/calcium carbonate; CaCO 3 ) to strengthen porous materials, thereby enhancing the material's engineering properties. MICP has recently been applied to improve soil strength and stiffness [34], heal concrete cracks [35,36], generate bio-bricks from brick aggregates [37], and solidify/stabilise municipal solid waste incineration fly ash [38].…”

Section: Microbially Induced Calcite Precipitation In Soilmentioning

confidence: 99%

Use of Microbially Induced Calcite Precipitation for Soil Improvement in Compacted Clays

Punnoi

Arpajirakul

Pungrasmi

et al. 2021

Int. J. of Geosynth. and Ground Eng.

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In line with the recent promotion of biocementation as an environmentally friendly ground improvement method, this study presents an investigation into microbially induced calcite precipitation (MICP) as a method of improving the engineering properties of soft clay. Bacillus pasteurii bacterium in vegetative cell and bacterial spore forms were used to induce MICP in clay specimens. Untreated and treated clay specimens were tested for their mechanical properties and microstructures through unconfined compression (UC) tests, free-free resonance (FFR) tests, X-ray diffraction (XRD) tests, and scanning electron microscopy with energy dispersive X-ray (SEM/EDX) tests. Results showed that both vegetative cells and bacterial spores can effectively enhance the strength and modulus of clays by inducing MICP to generate calcite crystals. Clays treated with vegetative cells exhibited earlier improvements in their strength than clays treated with bacterial spores due to earlier activity availability; however, the clays treated with bacterial spores exhibited greater strength improvements in the long term. Bacterial spores may also prove more convenient to use in geotechnical engineering practice.

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Section: Microbially Induced Calcite Precipitation In Soilmentioning

confidence: 99%

Use of Microbially Induced Calcite Precipitation for Soil Improvement in Compacted Clays

Punnoi

Arpajirakul

Pungrasmi

et al. 2021

Int. J. of Geosynth. and Ground Eng.

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“…A small quantity of ammonium can be converted to nitrate and further to nitrogen via nitrification and denitrification. But the quantity of ammonium generation and its complete utilization by the nitrifying bacteria is still a question [61][62][63]. MICP via microbial ureolysis can be feasible for specific applications only if the end products can be further utilized such as ammonium chloride as in situ fertilizer [64].…”

Section: Urea Degradation or Ureolysismentioning

confidence: 99%

A critical review on microbial carbonate precipitation via denitrification process in building materials

2021

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The naturally occurring biomineralization or microbially induced calcium carbonate (MICP) precipitation is gaining huge attention due to its widespread application in various fields of engineering. Microbial denitrification is one of the feasible metabolic pathways, in which the denitrifying microbes lead to precipitation of carbonate biomineral by their basic enzymatic and metabolic activities. This review article explains all the metabolic pathways and their mechanism involved in the MICP process in detail along with the benefits of using denitrification over other pathways during MICP implementation. The potential application of denitrification in building materials pertaining to soil reinforcement, bioconcrete, restoration of heritage structures and mitigating the soil pollution has been reviewed by addressing the finding and limitation of MICP treatment. This manuscript further sheds light on the challenges faced during upscaling, real field implementation and the need for future research in this path. The review concludes that although MICP via denitrification is an promising technique to employ it in building materials, a vast interdisciplinary research is still needed for the successful commercialization of this technique.

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“…Microbial Induced Calcite Precipitation (MICP), which is an emerging and eco-friendly technique based on microbial mineralization, has been developed and applied in soil reinforcement [ 14 , 15 ], permeability reduction [ 16 , 17 ], slopes stabilization [ 18 , 19 ], surface reparation [ 20 , 21 ], liquefaction resistance enhancement [ 22 ] and as a heavy metal pollution treatment [ 23 ]. According to the reaction principles, microbial mineralization process of the MICP can be divided into several categorizes, e.g., urea hydrolysis, denitrification [ 24 ], iron reduction, enzymatic-induced carbonate precipitation (EICP) [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Mixing Microbial Induced Calcite Precipitation (MICP) with Pretreatment Procedure for Road Soil Subgrade Stabilization

Pan

et al. 2022

Materials

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Microbial induced carbonate precipitation (MICP) provides an alternative method to stabilize the soil. To further improve the reinforcement effect, this study aims to propose a strategy by incorporating the mixing MICP method with pretreatment procedure. A series of laboratory tests were performed to investigate the preparation parameters (including the moisture content and dry density of the soil, the concentration of urea and CaCl2 in cementation solution), the engineering properties, the CaCO3 distribution as well as the mineralogical and micro structural characteristics of pretreatment-mixing MICP reinforced soil (PMMRS). Based on the orthogonal experiment results, the optimum preparation parameters for PMMRS were determined. The UCS of PMMRS was more strongly dependent on the moisture content and concentration of CaCl2 than the concentration ratio of CaCl2 to urea. Moreover, it was testified that incorporation of pretreatment procedure improved the stabilization effect of traditional mixing MICP method on the clayed sand (CLS). The UCS of PMMRS specimen was increased by 198% and 78% for the pure CLS and the simple mixing MICP reinforced soil, respectively. Furthermore, the CaCO3 products generated consisted of the aragonite, calcite and vaterite, which distributed unevenly inside the specimen no matter the lateral or vertical direction. The reason for the uneven distribution might be that oxygen content varied with the regions in different directions, and hence affected the mineralization reaction. In addition, the mineralization reaction would affect the pore structure of the soil, which was highly related to the stabilization effect of MICP reinforced soil.

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Microbial induced solidification and stabilization of municipal solid waste incineration fly ash with high alkalinity and heavy metal toxicity

Cited by 30 publications

References 49 publications

Use of Microbially Induced Calcite Precipitation for Soil Improvement in Compacted Clays

Use of Microbially Induced Calcite Precipitation for Soil Improvement in Compacted Clays

A critical review on microbial carbonate precipitation via denitrification process in building materials

Incorporation of Mixing Microbial Induced Calcite Precipitation (MICP) with Pretreatment Procedure for Road Soil Subgrade Stabilization

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