Experimental Optimization of Microbial-Induced Carbonate Precipitation for Soil Improvement

Martinez, Brian; DeJong, Jason T.; Ginn, Timothy R.; Montoya, Brina M.; Barkouki, Tammer; Hunt, C.; Tanyu, Burak F.; Major, D. J.

doi:10.1061/(asce)gt.1943-5606.0000787

Cited by 415 publications

(170 citation statements)

References 17 publications

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“…The most common approach involves the intra-soil cultivation of microbes to produce precipitates, such as the microbially induced calcite precipitation (MICP) method [71]. The resulting precipitates then form inter-particle cementation between coarse soil particles [29,30,57,85]. The MICP method has been widely explored in efforts to enhance the inter-particle cementation, which results in significant cohesion enhancement [23,27,53,59] and hydraulic conductivity control [24,28] of sandy or silty soils.…”

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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“…Keunggulan dari teknik ini terletak pada proses bio-geo-kimia yang secara efektif memacu pengendapan mineral. Teknik MICCP tersebut dianggap salah satu teknik yang menjanjikan untuk perbaikan tanah yang dimediasi oleh mikroba (DeJong et al, 2011;Martinez et al, 2013). Bagaimanapun juga, hasil-hasil penelitian yang dipublikasikan masih memaparkan tingkat awal dan belum ada yang sampai mencobanya pada tingkat aplikasi.…”

Section: Pendahuluanunclassified

“…Perbaikan dari sifat mekanis tanah sudah banyak dilaporkan dari hasil-hasil riset skala laboratorium (DeJong et al, 2006;Whiffin et al, 2007;Martinez et al, 2013). Hasilnya menunjukkan bahwa perbaikan sifat tanah melalui mediasi mikroba memiliki potensi untuk perbaikan sifat tanah in-situ untuk beragam kegunaan dan kondisi bawah permukaan.…”

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Perbaikan tanah melalui mediasi hayati [Bio-mediated soil improvement]

Goenadi¹

2017

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AbstrakSifat tanah yang tidak mampu memberikan dukungan fisika-mekanis yang diperlukan seringkali menjadi kendala dalam pemanfaatannya baik untuk pertanian maupun konstruksi. Cara-cara yang umum adalah dengan aplikasi bahan kimia yang tidak saja mahal, tetapi juga tidak ramah lingkungan. Oleh karena itu diperlukan teknologi baru, berkelanjutan, dan inovatif untuk memperbaiki sifat-sifat mekanis tanah. Beberapa penelitian telah memberikan peluang untuk memanfaatkan mikroba untuk tujuan ini, khususnya mikroba yang memiliki kemampuan untuk menghasilkan senyawa metabolit sekunder penguat struktur partikel tanah seperti enzim urease. Bakteri penghasil enzim ini mampu mendorong pembentukan mineral kalsit yang berfungsi sebagai perekat antar partikel tanah. Bagaimanapun juga, aplikasi teknologi ini secara langsung di lapangan menghadapi beberapa kendala, seperti interaksi tanah dan cairan ruang pori, bioaugmentasi vs biostimulan dari komunitas mikroba, penyebaran terkendali dari pengendapan kalsit yang dimediasi, dan sementasi permanen. Tulisan ini menyajikan secara singkat pengembangan teknologi perbaikan sifat fisik mekanis tanah melalui aplikasi mikroba untuk memenuhi persyaratan pekerjaan konstruksi.[Kata kunci : sifat fisika tanah, sifat mekanis, mikroba ureolitik, cairan ruang pori, pengendapan kalsit] PendahuluanKebutuhan infrastruktur sipil untuk pertanian dan non-pertanian membuka peluang untuk teknologi yang berkelanjutan yang memenuhi persyaratan sosial dengan pembiayaan yang efisien dan berdampak negatif rendah. Pengendalian dan modifikasi sifat-sifat tanah sangat penting untuk aplikasi geoteknik, geolingkungan, pertanian, dan yang lainnya. Praktek yang umum digunakan di bidang konstruksi adalah dengan menyuntikkan bahan sintetik ke dalam lapisan bawah permukaan melalui teknik pengisian celah dengan aliran bahan kimia untuk mengikat partikel tanah dan *) Penulis

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“…Laboratory-scale element tests have shown substantial (. 10 3 3) increases in strength (DeJong et al, 2006;Whiffin et al, 2007;Van Paassen et al, 2009;Chu et al, 2011Chu et al, , 2013Al Qabany & Soga, 2013), decreases in hydraulic conductivity greater than two orders of magnitude Rusu et al, 2011;Martinez et al, 2013), increases in small-strain stiffness by three orders of magnitude (DeJong et al, 2006;Van Paassen et al, 2010b;Van Paassen, 2011;Esnault-Filet et al, 2012), and an increase in dilative tendencies (Chou et al, 2011;Tagliaferri et al, 2011). Even after cementation degrades owing to shearing, the reduction in pore space (or increase in solids density) due to the precipitated calcite alters the behaviour of the material.…”

Section: Microbially Induced Calcite Precipitationmentioning

confidence: 99%

Biogeochemical processes and geotechnical applications: progress, opportunities and challenges

DeJong¹,

Soga²,

Kavazanjian³

et al. 2014

Bio- And Chemo-Mechanical Processes in Geotechnical Engineering

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117

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Consideration of soil as a living ecosystem offers the potential for innovative and sustainable solutions to geotechnical problems. This is a new paradigm for many in geotechnical engineering. Realising the potential of this paradigm requires a multidisciplinary approach that embraces biology and geochemistry to develop techniques for beneficial ground modification. This paper assesses the progress, opportunities, and challenges in this emerging field. Biomediated geochemical processes, which consist of a geochemical reaction regulated by subsurface microbiology, currently being explored include mineral precipitation, gas generation, biofilm formation and biopolymer generation. For each of these processes, subsurface microbial processes are employed to create an environment conducive to the desired geochemical reactions among the minerals, organic matter, pore fluids, and gases that constitute soil. Geotechnical applications currently being explored include cementation of sands to enhance bearing capacity and liquefaction resistance, sequestration of carbon, soil erosion control, groundwater flow control, and remediation of soil and groundwater impacted by metals and radionuclides. Challenges in biomediated ground modification include upscaling processes from the laboratory to the field, in situ monitoring of reactions, reaction products and properties, developing integrated biogeochemical and geotechnical models, management of treatment by-products, establishing the durability and longevity/reversibility of the process, and education of engineers and researchers.

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Experimental Optimization of Microbial-Induced Carbonate Precipitation for Soil Improvement

Cited by 415 publications

References 17 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

Perbaikan tanah melalui mediasi hayati [Bio-mediated soil improvement]

Biogeochemical processes and geotechnical applications: progress, opportunities and challenges

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