Effects of microorganisms on hydraulic conductivity decrease in infiltration

Seki, Katsutoshi; Miyazaki,; Nakano, Mikio

doi:10.1046/j.1365-2389.1998.00152.x

Cited by 105 publications

(47 citation statements)

References 25 publications

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“…Meanwhile, if organic matter is the nucleus for aggregation and located in the centre of the aggregate (Chenu and Stotzky 2002), it would clog up pores, resulting in a higher a-value, because K ns decreases faster as water invades a clogged pore system than an unclogged one. Finally, a pore network clogged either by air bubbles or sorbed organic matter will have a lower K ns value than an open one, consistent also with previous observations made Seki et al 1998;Seki and Miyazaki 2001;Zaher et al 2005).…”

Section: Discussionsupporting

confidence: 89%

Aggregate slaking during rapid wetting: Hydrophobicity and pore occlusion

Zaher¹,

Caron

2008

Can. J. Soil. Sci.

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Zaher, H. and Caron, J. 2008. Aggregate slaking during rapid wetting: Hydrophobicity and pore occlusion. Can. J. Soil Sci. 88: 85Á97. The slaking process after rapid wetting is a key factor controlling soil structural stability in dry soil, and an understanding of the relative importance of the different mechanisms involved in slaking may help in the design of management strategies aimed at maintaining a stable surface soil structure. Slaking has been linked to, among other factors, rapid pressure build-up in aggregate, and previous work has emphasized the role of organic matter to hamper that pressure build-up, possibly due to hydrophobicity, reducing rapid water entry within aggregates and hence the build-up. This study emphasizes this latter aspect linked to slaking. The evolution of the intra-aggregate pressure, the matter lost by slaking and the expelled air after rapid wetting of two soils of different textures (clay loam soil and silty-clay loam soil) amended with different types of paper sludge were studied. Hydrophobicity effects were also studied using a tensio-active solution. The results of these experiments showed that when aggregates were submitted to sudden wetting, those treated with paper sludge had an improved resistance to the destructive action of rapid wetting. The lower pressures measured in the aggregates from the amended soils and having less slaking resulted most likely from slow water entry and reduced swelling. Detailed investigation on the link between hydrophobicity and water entry revealed that the true hydrophobic effect (modification of contact angle) was non-existent for the silty-clay loam and minor for the clay loam. This study, rather, suggests that changes in the water potential at the wetting front following organic matter addition and aggregate immersion most likely depend on pore occlusion and on changes in pore surface roughness.Key words: Aggregate stability, organic matter, slaking, pressure, swelling, wettability Zaher, H. et Caron, J. 2008. De´sagre´gation du sol apre`s mouillage rapide : hydrophobicite´et occlusion des pores. Can. J. Soil Sci. 88: 85Á97. La de´sagre´gation apre`s mouillage rapide joue un roˆle capital dans le maintien de la stabilite´structurale du sol et comprendre l'importance relative des diffe´rents me´canismes a`son origine pourrait faciliter l'e´laboration de strate´gies de gestion visant a`stabiliser la structure du sol de surface. On a notamment associe´la de´sagre´gation a`l'e´le´vation rapide de la pression dans les agre´gats et des recherches ante´rieures ont mis en relief le roˆle de la matie`re organique qui, peut-eˆtre ac ause de son hydrophobicite´, ralentit la pe´ne´tration de l'eau dans les agre´gats, donc la hausse de pression. La pre´sente e´tude souligne cet aspect, associe´a`la de´sagre´gation. Les auteurs ont examine´l'e´volution de la pression dans les agre´gats, la matie`re perdue lors du phe´nome`ne et l'air expulse´apre`s mouillage rapide d'un sol de deux textures (loam argileux et loam limoneux-argileux) auquel on avait aj...

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Section: Discussionsupporting

confidence: 89%

Aggregate slaking during rapid wetting: Hydrophobicity and pore occlusion

Zaher¹,

Caron

2008

Can. J. Soil. Sci.

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“…The application of the MICP technique has shown promise in various fields, including improvement in the stiffness/strength of sandy soil (Rong et al, 2012;van Paassen, 2009;Whiffin et al, 2007); reductions in foundation settlement (DeJong et al, 2010) and soil permeability (Dennis and Turner, 1998;Seki et al, 1998) ); microbially enhanced oil recovery (Nemati et al, 2005); dust control (Meyer et al, 2011); and wastewater treatment (Hammes et al, 2003).…”

mentioning

confidence: 99%

Improving sand with microbial-induced carbonate precipitation

Shahrokhi-Shahraki

Zomorodian

Niazi‎

et al. 2015

Proceedings of the Institution of Civil Engineers - Ground Impr

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Microbial-induced carbonate precipitation using urea hydrolysis is a relatively new improvement technique for granular soils. An important factor in achieving uniform calcite deposition (and hence consistent improvements in geomechanical properties) throughout the treated soil mass is the protocol adopted for injecting the reagents of ureolytic bacteria, urea and calcium. This paper reports a laboratory study investigating a technique to treat two loose medium quartz sands using different injection strategies. Staged injection including retention periods, and with a pressure head applied during injection of the bacterial cell solution, proved most effective. Sand specimens were treated using different concentrations of bacterial cell and urea–calcium chloride solutions and for a single injection cycle. Measured strength and stiffness values from unconfined compression tests ranged from 50 to 240 kPa and from 6 to 56 MPa, respectively. Permeability coefficient values were reduced by up to approximately one order of magnitude. Hence, a single injection cycle adhering to the proposed treatment method did not significantly affect the drainage capacity of the sand media. Greater improvements in stiffness and strength were achieved for lower bacterial cell and higher cementation solution concentrations, with a higher molarity of urea (non-equimolar solutions) proving even more effective. These findings were confirmed by scanning electron microscope observations.

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“…Attempts have been made to use bioclogging to decrease hydraulic conductivity in situ beneath and within dams and levees, to reduce infiltration from ponds, to reduce leakage at landfills, to plug high hydraulic conductivity layers surrounding oil bearing layers, and to control groundwater migration with subsurface barriers (Fig. 2(b); Seki et al, 1998;James et al, 2000;Lambert et al, 2010).…”

Section: Biofilm Formationmentioning

confidence: 99%

“…However, most investigations of applications of in situ biopolymer growth and EPS generation have focused on reduction in hydraulic conductivity to form hydraulic barriers (e.g. Wu et al, 1997;Bonala & Reddi, 1998;Seki et al, 1998). Furthermore, there are many case histories of clogging of filters in dams, landfills and water treatment plants caused by the growth of biofilms (Cullimore, 1990;Ivanov & Chu, 2008).…”

Section: Biopolymers and Epsmentioning

confidence: 99%

Biogeochemical processes and geotechnical applications: progress, opportunities and challenges

DeJong¹,

Soga²,

Kavazanjian³

et al. 2013

Géotechnique

602

144

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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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Effects of microorganisms on hydraulic conductivity decrease in infiltration

Cited by 105 publications

References 25 publications

Aggregate slaking during rapid wetting: Hydrophobicity and pore occlusion

Aggregate slaking during rapid wetting: Hydrophobicity and pore occlusion

Improving sand with microbial-induced carbonate precipitation

Biogeochemical processes and geotechnical applications: progress, opportunities and challenges

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