Effects of smectite, salinity and water content on sedimentation and self-weight consolidation of thoroughly disturbed soft marine clay

Kondo, Fumiyoshi; Torrance, J. Kenneth

doi:10.1007/s10333-005-0012-8

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…Thus, the initial water content was fixed as 500% to render sufficient interaction between clay minerals and biopolymer additives. Previous researches also determined 500% water content for experiments (Imai 1981, Kondo andTorrance 2005). The inside diameter of the graduated cylinder was 26.5 mm, and was larger than the -yield diameter‖, which is the diameter at which settling cannot occur due to the wall effect, which was about 13 mm for this experiment (Michaels and Bolger 1962).…”

Section: Experimental Set Up 221 Sedimentationmentioning

confidence: 71%

ε-polylysine biopolymer for coagulation of clay suspensions

Kwon¹,

Im²,

Chang³

et al. 2017

Geomech. Eng.

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The coagulation or flocculation of cohesive clay suspensions is one of the most widely used treatment technologies for contaminated water. Flocculated clay can transport pollutants and nutrients in ground water. Coagulants are used to accelerate these mechanisms. However, existing coagulants (e.g., polyacrylamide, polyaluminum chloride) are known to have harmful effects in the environment and on human health. As an alternative, eco-friendly coagulant, this study suggests ε-polylysine, a cationic biopolymer fermented by Streptomyces. A series of sedimentation experiments for various ε-polylysine concentrations were performed, and the efficiency of sedimentation with ε-polylysine was estimated by microscopic observation and light absorbance measurements. Two types of sedimentation were observed in the experiments: accumulation sedimentation (at 0.15%, 0.20%, 0.25% ε-polylysine) and flocculation sedimentation (at 0%, 0.1%, 0.5%, 1.0%, 2.0% ε-polylysine). These sedimentation types occur as a result of the concentration of counter ions. Additionally, the performance of εpolylysine was compared with that of a previously used environmentally friendly coagulant, chitosan. The obtained results indicate that flocculation sedimentation is appropriate for contamination removal and that ε-polylysine functions more efficiently for clay removal than chitosan. From the experiments and analysis, this paper finds that polylysine is an alternative eco-friendly coagulant for removing chemical contaminants in groundwater.

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Section: Experimental Set Up 221 Sedimentationmentioning

confidence: 71%

ε-polylysine biopolymer for coagulation of clay suspensions

Kwon¹,

Im²,

Chang³

et al. 2017

Geomech. Eng.

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“…All of the test results are classified and shown in Consolidation settling takes place in all the columns for concentrated suspensions. The whole suspension forms an interconnected flocculation that extends throughout the total volume immediately after the mixing, and then it commences to consolidate under its own weight (Kondo and Torrance 2005). For dilute suspensions with water contents of 10 and 15 times corresponding liquid limit in this study, the aggregates are small because the water content is in a high level.…”

Section: Settling Modementioning

confidence: 76%

“…is about 14.5 centimeters. Kondo and Torrance (2005) indicated that as the particle concentration of soft marine clay increases, the probability of flocculation increases, and the size of the flocs that develop also increase. Accordingly, the aggregate size decreases as the initial water content of slurry becomes higher.…”

Section: End Conditions Of Settling Stagementioning

confidence: 99%

“…Tan et al (1990a) indicated that the settling phenomenon was dependent on many factors, such as sizes and shapes of particles, concentration of particles, chemical content of particles and suspension medium. Other factors including salinity, initial height, total solid weight, pH value, smectite were detected by sedimentation experiments (Michaels and Bolger 1962;Peirce and Williams 1966;Imai 1980;Tan et al 1990b;Kondo and Torrance 2005). But column diameter has not been considered as a specific factor affecting the sedimentation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Column Diameter on Setting Behavior of Dredged Slurry in Sedimentation Experiments

Gao

Zhang

Zhou

et al. 2015

Marine Georesources & Geotechnology

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Downloaded by [University of Otago] at 18:16 21 July 2015Diameter Effect of Sedimentation Experiment 2 This paper investigates the influence of dimensions of settling column on the settling mode and the settling rate. End conditions of settling stage in the hindered settling were also analyzed. It was found that the settling mode in column with a smaller diameter tends to be consolidation settling. The effect of settling column wall decreases with increasing the column diameter and it can be ignored provided the column diameter is larger than 14.5 centimeters. For the difference in initial water content, the settling behavior of slurry develops a different sensitivity to the diameter effect. The influence of column diameter reduces as the initial water content of slurry becomes higher. It is suggested that the internal diameter of column used in a sedimentation experiment should be 14.5 centimeters.

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“…This is significant for sediment transport due to the tendency for clay flocculation at the saltwater-freshwater interface. Floc size, and thereby settling velocity, increases with increased salinity (Kondo and Torrance 2005). For example, increasing the salinity from 0 to 30 PSU during laboratory experiments was found to increase the settling velocity by a factor of 6.5 (Portela et al 2013).…”

Section: Definition Of Estuarine Circulationmentioning

confidence: 94%

A review of tidal embayment shoaling mechanisms in the context of future wetland placement

Krafft¹,

Bain²,

Cadigan³

et al. 2022

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Wetland construction in tidally influenced embayments is a strategy for beneficial use of sediment dredged from nearby navigation channels. These projects have the potential to alter basin morphology, tidal hydrodynamics, and shoaling trends. This special report provides a broad review of the literature related to engineering-induced changes in tidal range, salinity, tidal prism, tidal asymmetry, and other known causes of shoaling. Each potential shoaling mechanism is then evaluated in the context of wetland placement to provide a foundation for future beneficial use research. Based on a compilation of worldwide examples, wetland placement may reduce tidal amplitude and enhance ebb current dominance, thus reducing shoaling rates in the channels. However, constructed wetlands could also reduce the embayment’s tidal prism and cause accelerated shoaling relative to the pre-engineered rate. Because constructed wetlands are often created in conjunction with navigation channel dredging, the system’s morphologic response to wetland construction is likely to be superimposed upon its response to channel deepening, and the net effect may vary depending on a variety of system-specific parameters. Planning for future wetland placements should include an evaluation of local hydrodynamic behavior considering these factors to predict site-specific response.

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Effects of smectite, salinity and water content on sedimentation and self-weight consolidation of thoroughly disturbed soft marine clay

Cited by 12 publications

References 15 publications

ε-polylysine biopolymer for coagulation of clay suspensions

ε-polylysine biopolymer for coagulation of clay suspensions

Effects of Column Diameter on Setting Behavior of Dredged Slurry in Sedimentation Experiments

A review of tidal embayment shoaling mechanisms in the context of future wetland placement

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