The Use of Slime-forming Bacteria to Enhance the Strength of the Soil Matrix

Yang, Iris C. Y.; Li, Yueqi; Park, Joon Kyu; Yen, Teh Fu

doi:10.1016/s0376-7361(09)70052-4

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…The presence of biofilm is expected to influence both the friction angles and adhesion/ cohesion properties of various landfill components, yet little effort has been made to investigate its significance. Indeed, work performed by Daniels et al (2002), Yen et al (1996) and Yang et al (1993) as well as literature from soil science suggests that the presence of biofilm-type substances can result in either decreases or increases in shear strength. Any change in shear strength is of direct interest for the stability of landfill covers with respect to sliding.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the intensity of biofilm production, it may only consist of dispersed microcolonies with vast separation in between, or with continued growth, these may coalesce to form a contiguous film that coats all available surface area (Clement et al 1996). Yang et al (1993) investigated the influence of different commercial biopolymers (polyhydroxybutyrate, xanthan gum and sodium alginate) as well as a "slime-forming" bacterial suspension on the shear strength of sand and clay. The authors reported increases in strength for all cases, with improvements ranging from 2% to nearly 200%.…”

Section: Introductionmentioning

confidence: 99%

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Consolidation and Strength Characteristics of Biofilm Amended Barrier Soils

Daniels¹,

Cherukuri²,

Ogunro³

Appropriate Technologies for Environmental Protection in the Developing World

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Experimental work was conducted to investigate the influence of biofilm on the consolidation and strength characteristics of two barrier soils. Biofilm has potential as a low-cost additive for soil stabilization, and it may be formed naturally in landfills throughout the developing world. The EPS-producing bacterium Beijerinckia indica was used to prepare solutions of varying concentration of exopolymeric substances (EPS). These solutions were then used as the molding moisture for compacted specimens of locally available clay ("red bull tallow," RBT) as well as a mix of 65% sand and 35% bentonite (65:35 mix). As compared to tap water, the influence of the nutrient solution or biofilm on RBT is to increase the compression index (C c ), although this trend is variable for increasing EPS concentration. While the effect of biofilm on the 65:35 mix is less uniform, the largest increase in C c was observed for the highest level of biofilm amendment (EPS-5, 300 mg/L). Amendment with biofilm results in both increases and decreases in the rate of consolidation (c v ). The c v values ranged from 0.4 to 13.6 m 2 /year and from 0.2 to 19.3 m 2 /year for RBT and 65:35 mix, respectively. In general, EPS has a decreasing effect on observed strength. For example, the peak unconfined compressive strengths for unmodified RBT and 65:35 mix were found to be 667.0 and 395.3 kPa, respectively. Many of these values decreased with increasing biofilm amendment, and for the highest level of amendment, the observed peak strengths were 159.1 and 98.8 kPa. To the extent that naturally-occurring methanotrophic activity in landfill cover systems results in biofilm production, the results suggest potential concerns with cover stability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Consolidation and Strength Characteristics of Biofilm Amended Barrier Soils

Daniels¹,

Cherukuri²,

Ogunro³

Appropriate Technologies for Environmental Protection in the Developing World

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“…Literatürde son yıllarda yapılan çalışmalar zemin içindeki bakteriler veya biyopolimerlerle oluşturulan biyolojik aktivitelerin, zeminlerin yapısını etkilediğini ortaya koymuştur [4]. Geoteknik mühendisliğinde taşıma gücünün ve sıvılaşma direncinin arttırılması, zemin erozyonu ve yer altı suyu kontrolü, zemin ve yer altı suyunun arıtılması geçirimsiz bariyer oluşturulması, tarama malzemelerinin stabilizasyonu gibi birçok uygulamada biyopolimerler kullanılmaktadır [5], [6]. Geçmişten günümüze yapılan sınırlı sayıdaki çalışmalar, az miktardaki (%0.5) biyopolimer katkısının bile zeminlerin kayma dayanımında önemli bir artışa neden olduğunu vurgulamıştır [3], [7].…”

Section: Introductionunclassified

“…Zemin iyileştirme olarak uygulanan salgı salgılayan bakteri ya da ticari biyopolimer örnek olarak PHB, zantan gam ve sodyum alginitin iyileştirme boyutu Yang ve diğ. [6] tarafından incelenmiştir. Zantan gam ve sodyum alginitte ayrı ayrı saf su ile çözelti oluşturularak karıştırılmıştır.…”

Section: Introductionunclassified

Investigation of the biopolymer additives effect on permeability and shear strength of clayey and sandy soils

Pulat¹,

Taytak²,

Yükselen-Aksoy³

2017

Pamukkale J Eng Sci

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“…Results from this work indicate that these macromolecules can bind soil particles, apparently increasing the resistance to crack and fissure formation (Daniels et al , 2003; Daniels and Inyang, 2004) although also resulting in a decrease in unconfined compressive strength and modulus (Daniels et al , 2002). Yang et al (1993) investigated the influence of different commercial biopolymers (polyhydroxybutyrate, xanthan gum and sodium alginate) as well as a “slime‐forming” bacterial suspension on the shear strength of sand and clay. The authors reported increases in strength for all cases, with improvements ranging from 2 percent to nearly 200 percent.…”

Section: Introductionmentioning

confidence: 99%

Engineering behavior of biofilm amended earthen barriers used in waste containment

Daniels¹,

Cherukuri²,

Hilger³

et al. 2005

Management of Env Quality

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PurposeThe purpose of this paper is to evaluate the influence of a mixture of nutrient solution, bacteria and biofilm on the consolidation, unconfined compression and desiccation characteristics of two soils that could be used in waste containment applications.Design/methodology/approachExperimental work was conducted to investigate the influence of biofilm on the desiccation, strength and consolidation characteristics of two barrier soils. The soils were evaluated with water alone and with a biofilm solution composed of nutrients, bacteria and exopolymeric substances (EPS). These solutions were mixed with a locally available clay (“red bull tallow” (RBT)) as well as a mix of 65 percent sand and 35 percent bentonite (65‐35 Mix).FindingsReductions in strength and increases in ductility are observed with biofilm amendment for two soil types. The shear strength was reduced from 413 to 313 kPa and from 198 to 179 kPa for RBT and 65‐35 Mix, respectively. Desiccation tests reveal an increase in moisture retention for early time increments in amended specimens, while both increases and decreases are noted after extended drying. Increases in the rate of consolidation and modest decreases in the compression and swell index were observed. In particular, the consolidation coefficient was increased from 0.036 to 0.064 cm2/min and from 0.060 to 0.093 cm2/min for RBT and 65‐35 Mix, respectively.Practical implicationsThese results are useful in establishing the broader impacts of using biofilm as an additive to increase the performance (e.g. reduce hydraulic conductivity and increase resistance to crack formation) of barrier materials in waste containment applications. Moreover, the data provide insight into the geotechnical implications of biofilm‐producing methanotrophic activity that occurs naturally in the covers of municipal solid waste landfills.Originality/valueVery little research has been published on the influence of biofilm on the behavior of barrier materials in general, and on geotechnical properties in particular. This paper is unique in making the connection between methanotrophic activity, soil modification and barrier material performance.

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The Use of Slime-forming Bacteria to Enhance the Strength of the Soil Matrix

Cited by 10 publications

References 2 publications

Consolidation and Strength Characteristics of Biofilm Amended Barrier Soils

Consolidation and Strength Characteristics of Biofilm Amended Barrier Soils

Investigation of the biopolymer additives effect on permeability and shear strength of clayey and sandy soils

Engineering behavior of biofilm amended earthen barriers used in waste containment

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