Hydraulic Conductivity of a Biopolymer Treated Sand

Wiszniewski, Mateusz; Çabalar, Ali Fırat

doi:10.1061/9780784413456.003

Cited by 19 publications

(4 citation statements)

References 3 publications

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“…Wiszniewski [155] reported a reduction in the hydraulic conductivity when two different samples of sandy soils were treated with 0.1-1.5% xanthan gum from the bacterial species Xanthomonas campestris; the reductions recorded were from 7.16 × 10 −3 to 5.75 × 10 −5 m/s and from 8.46 × 10 −3 to 2.84 × 10 −11 m/s for the two samples, respectively. Some species of the organisms used in MICP processes have the potential to form a biomass or biofilm: these substances have been reported to be linked with factors responsible for the reduction in the hydraulic conductivity, in addition to blockage of voids in the soil medium by calcite precipitate [152,153,156].…”

Section: Hydraulic Conductivitymentioning

confidence: 99%

Review of the use of microorganisms in geotechnical engineering applications

et al. 2020

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Until recently, engineers either ignored or neglected the role of microorganisms in geotechnical engineering. The microbially induced calcite precipitation (MICP) research technique is an innovative and relatively green technology which consists in a biological process through which microorganisms react with minerals (calcium source and cementation reagent) to produce calcite (CaCO 3 ) as a byproduct that modifies and improves the engineering properties of soil. Laboratory and field results obtained from various studies are promising and viable, suggesting potential for various engineering applications. This research technique has also been considered to be useful in many engineering applications such as improvement of construction materials, cementation of porous media, improvement in strength and stiffness of engineering soils, hydraulic control of engineering facilities (waste containment), liquefaction, and erosion mitigation. In this review, the various methods of production of calcium carbonates (calcite), the role played by bacteria, various state-of-the-art procedures that have evolved in this research area, as well as ongoing studies are reported. Furthermore, the use of the MICP technique in remediation of contaminants and other environmental concerns is also presented. The advantages and challenges (in form of undesired byproducts) of this research technique are highlighted herein.

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Section: Hydraulic Conductivitymentioning

confidence: 99%

Review of the use of microorganisms in geotechnical engineering applications

et al. 2020

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“…Additionally, [8] found a maximum reduction of 98.18% in the hydraulic conductivity of compacted lateritic soil treated at 2% water content with a 6.0 × 108 cells/ml suspension density of S. pasteurii. When two different samples of sandy soil were treated with 0.1-1.5% xanthan gum from the bacterial species Xanthomonascampestris, [9] reported a reduction in hydraulic conductivity; the reductions recorded were from 7.16 × 10−3 to 5.75 × 10−5 m/s and from 8.46 × 10−3 to 2.84 × 10−11 m/s for the two samples, respectively. The formation U.M.…”

Section: Overviewmentioning

confidence: 99%

Behaviours of Natural and Sporosarcina Pasteurii (Bacillus Pasteurii) as a Liner

Falalu,

Sani,

Moses

2023

ETJ

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The enhancement of sandy soil as a liner and cover material for usage as waste containment facility was taken into consideration in this work using Bacillus pasteurii to activate the microbial-induced calcite precipitation (MICP) process. This study aimed at determining the physical properties of SPOROSARCINA PASTEURII (BACILLUS PASTEURII) as a liner. The study's sandy soil, which had a natural moisture content of 8.56%, came from Wudil Local Government Area in Kano State, Nigeria. Stepped Bacillus pasteurii suspension densities of 0 cells/ml, 1.5 x 108 cells/ml, 6 x 108 cells/ml, 12 x 108 cells/ml, 18 x 108 cells/ml, and 24 x 108 cells/ml were applied to the sandy soil. The Atterberg's limit test result, which showed that the soils were nonplastic, was used to determine the index properties of the soil. The soil was classified as A-3(0) and SP soil, respectively, according to the AASHTO and USCS classification systems. The specific gravity decreases with increase in Bacillus pasteurii suspension density

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“…Recently, the incorporation of biopolymers, which are environmentally friendly and eco-compatible, in soils is proposed as one technique to reduce soil water repellency. The addition of biopolymers with polysaccharidic structures (such as xanthan gum or gellan gum) at a concentration of 2% by weight increases the water permeability of sand of various gradations by two to four orders of magnitude [ 10 , 11 , 12 ]. In addition to sandier soils, the use of 1% xanthan gum successfully lowered the saturated water permeability of clayey soils by more than 80% [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrating Capabilities of the Biopolymers Produced by the Marine Thermophilic Bacillus horneckiae SBP3 as Evaluated by ATR-FTIR Spectroscopy

et al. 2022

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The surfactin-like lipopeptide (BS-SBP3) and the exopolysaccharide (EPS-SBP3) produced by the polyextremophilic Bacillus horneckiae SBP3 (DSM 103063) have been recently described as valuable biopolymers useful in biotechnological applications. To investigate the hydrating capabilities of BS-SBP3 and EPS-SBP3, here we evaluated (i) their wetting properties, measuring the contact angle; (ii) their moisture uptake abilities using the gravimetric method; and (iii) their hydrating states (from 0 to 160% w/w of water content) using ATR-FTIR spectroscopy. BS-SBP3 reduced the water contact angle on a hydrophobic surface from 81.7° to 51.3°, whereas the contact angle in the presence of EPS-SBP3 was 72.9°, indicating that BS-SBP3 improved the wettability of the hydrophobic surface. In the moisture uptake tests, EPS-SBP3 absorbed more water than BS-SBP3, increasing its weight from 10 mg to 30.1 mg after 36 h of 100% humidity exposure. Spectral distance and cross-correlation analyses were used to evaluate the molecular changes of the two biopolymers during the hydration process. As the water concentration increased, BS-SBP3 spectra changed in intensity in the two contributions of the OH-stretching band named “closed” and “open” (3247 and 3336 cm−1, respectively). Differently, the spectra of EPS-SBP3 exhibited a broader peak (3257 cm−1), which shifted at higher water concentrations. As evaluated by the spectral distance and the wavelet cross-correlation analysis, the OH-stretching bands of the BS-SBP3 and EPS-SBP3 changed as a function of water content, with two different sigmoidal trends having the inflection points at 80% and 48%, respectively, indicating peculiar water-properties of each biopolymer. As wetting agents, these biopolymers might replace industrially manufactured additives in agriculture and the food and cosmetic industries.

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Hydraulic Conductivity of a Biopolymer Treated Sand

Cited by 19 publications

References 3 publications

Review of the use of microorganisms in geotechnical engineering applications

Review of the use of microorganisms in geotechnical engineering applications

Behaviours of Natural and Sporosarcina Pasteurii (Bacillus Pasteurii) as a Liner

Hydrating Capabilities of the Biopolymers Produced by the Marine Thermophilic Bacillus horneckiae SBP3 as Evaluated by ATR-FTIR Spectroscopy

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