Introduction of Microbial Biopolymers in Soil Treatment for Future Environmentally-Friendly and Sustainable Geotechnical Engineering

Chang, Ilhan; Im, Jooyoung; Cho, Gye-Chun

doi:10.3390/su8030251

Cited by 282 publications

(138 citation statements)

References 89 publications

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“…They are commonly used as thickeners or emulsifiers in food and medical products, due to their gelphase rheological characteristics [51]. Since the introduction of biopolymers in construction engineering [68], their use for geotechnical engineering purposes has also been explored [13,20,35,46,66]. Recent studies on microbial biopolymers externally produced in culture tanks, such as polysaccharides, have demonstrated remarkable strengthening efficiency in such applications.…”

Section: Introductionmentioning

confidence: 99%

Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

2018

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Microbial biopolymers have recently been introduced as a new material for soil treatment and improvement. Biopolymers provide significant strengthening to soil, even in small quantities (i.e., at 1/10th or less of the required amount of conventional binders, such as cement). In particular, thermo-gelating biopolymers, including agar gum, gellan gum, and xanthan gum, are known to strengthen soils noticeably, even under water-saturated conditions. However, an explicitly detailed examination of the microscopic interactions and strengthening characteristics between gellan gum and soil particles has not yet been performed. In this study, a series of laboratory experiments were performed to evaluate the effect of soil-gellan gum interactions on the strengthening behavior of gellan gum-treated soil mixtures (from sand to clay). The experimental results showed that the strengths of sand-clay mixtures were effectively increased by gellan gum treatment over those of pure sand or clay. The strengthening behavior is attributed to the conglomeration of fine particles as well as to the interconnection of fine and coarse particles, by gellan gum. Gellan gum treatment significantly improved not only interparticle cohesion but also the friction angle of clay-containing soils.

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Section: Introductionmentioning

confidence: 99%

Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

2018

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“…Chemical grouting is a most common and effective way to treat weak soils. Cement is the main material use for the chemical grouting, but cement production is more energy consuming and environmental unfriendly method, CO2 emission from the cement production is 7% from the global CO2 emissions [1]. So, today world is seeking for an environmentally friendly biological approach to treat the loose soils.…”

Section: Introductionmentioning

confidence: 99%

“…In MICP process, CaCO3 is precipitated by hydrolysis of the Urea by using ureolytic bacteria and it includes biochemical reactions governed by urease enzyme produced by these ureolytic bacteria as given in the Eqs. (1)(2)(3) [2]- [7].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Microbially Induced Carbonate Precipitation Using Organic Biopolymer

Nawarathna

Nakashima

Kawasaki

2018

GEOMATE

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Microbially induced carbonate precipitation (MICP) by using ureolytic bacteria is a novel and environmentally friendly way to treat the un-cemented sand. It was implemented successfully in number of geotechnical applications. Use of organic additives to improve the MICP process is a novel and interesting approach. In this research, effect of the cationic biopolymer poly-l-lysine on the MICP process was investigated by using ureolytic bacteria Pararhodobacter sp. Urea hydrolysis by the bacteria in the presence of CaCl2 was conducted with the addition of the polymer under different conditions. Morphology of the precipitate of CaCO 3 after oven dried was analyzed by using the scanning electron microscope. Bell-shaped curve was obtained for the variation between the amount of the precipitate with the increase of the amount of the poly-l-lysine. Poly-Llysine gives higher amount of precipitate than conventional MICP process and morphology of the crystals changed drastically from well-developed rhombohedral crystals to ellipsoidal shaped aggregates.

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“…Oil flow and alginate flow were controlled by injection pump (900 mL/h and 300 mL/h respectively), this difference is due to the solution viscosity. These experimental parameters were optimized in a previous research [40] [41] ( Table 1). …”

Section: Microencapsulation Process: Co-extrusion/gellingmentioning

confidence: 99%

Application of Antimicrobial Microcapsules on Agrotextiles

Ferrándiz¹,

Capablanca²,

Guzonas³

et al. 2017

JACEN

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The aim of this work was to develop a functional biodegradable nonwoven with antimicrobial microcapsules maintaining the stability and biodegradability of the nonwoven for use in agriculture applications. The nonwoven was obtained using hemp fibers by Wetlaid technology. Microcapsules were prepared by co-extrusion/gelling method with alginate as shell and oregano oil as core material. The microcapsules were developed to protect and control release of oregano oil. Microcapsules were incorporated on the nonwoven by coating method using a natural polymer as a graft material. After incorporating microcapsules, the nonwoven was subjected to several tests in order to determinate the microcapsules fixation and their functionality. The nonwovens were characterized for their antimicrobial activity against different kinds of bacteria and fungi. Nonwoven loaded with microcapsules was found to show good antimicrobial activity in comparison with nonwoven that was not loaded with microcapsules.

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Introduction of Microbial Biopolymers in Soil Treatment for Future Environmentally-Friendly and Sustainable Geotechnical Engineering

Cited by 282 publications

References 89 publications

Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

Enhancement of Microbially Induced Carbonate Precipitation Using Organic Biopolymer

Application of Antimicrobial Microcapsules on Agrotextiles

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