Mechanism of adhesion to activated sludge on carbon fiber at initial stage.

Yamada, Tetsurou; Sato, Makoto; Kamiishi, Youichi; Ōtani, Sugio; Kojima, Akira

doi:10.2115/fiber.54.11_591

Cited by 5 publications

(1 citation statement)

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“…These materials have also been used as biofilm supports in bioprocesses including wastewater treatment. For example, in Japan, CF has been empirically used for water purification in many aquatic fields and model treatment systems − since Kojima and co-workers found the high capacity of CF for adsorbing activated sludge, although the adsorbing mechanism remains unclear. CF has also been used in methane fermentation for degrading organic solid materials within anaerobic bioreactors or hydrogen fermentation in upflow anaerobic sludge blanket .…”

Section: Introductionmentioning

confidence: 99%

Carbon Fiber as an Excellent Support Material for Wastewater Treatment Biofilms

Matsumoto

Ohtaki

Hori

2012

Environ. Sci. Technol.

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Fibrous materials made of carbon fiber (CF), aromatic polyamide (AP), preoxidized polyacrylonitrile (PAN), and polyethylene (PE), which are widely used in the textile industry, were evaluated as biofilm supports for wastewater treatment. We found that CF has a high capacity for adsorbing nitrifying bacterial sludge. The adhesion rate of four pure strains-Cytophaga hutchinsonii, Alcaligenes faecalis, Bacillus subtilis, and Escherichia coli-was highest to CF. The ζ-potentials of the fibrous supports, and the cell surface potentials of these bacteria on the basis of the soft particle theory, were experimentally determined. Bacterial cell adhesion to the fibrous supports could be explained by Derjaguin-Landau-Verwey-Overbeek theory. Interaction energy profiles based on this theory indicated the disappearance of the energy barrier in bacterial cell adhesion to the CF support, whereas an insurmountable energy barrier was observed in the adhesion to the other fibrous supports. This result was attributed to the less negative ζ-potential of CF and the relatively large Hamaker constant for the CF/bacterium interaction in water; through simulations, the latter factor was found to make a greater contribution to lowering the energy barrier. In practice and theory, CF is an excellent material as a microbial and biofilm support for wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Carbon Fiber as an Excellent Support Material for Wastewater Treatment Biofilms

Matsumoto

Ohtaki

Hori

2012

Environ. Sci. Technol.

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Carbon nanotubes/carbon fiber hybrid material: a super support material for sludge biofilms

Liu

Dai

Bao³

2017

Environmental Technology

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Carbon fiber (CF) is widely used as a sludge biofilm support material for wastewater treatment. Carbon nanotubes/carbon fiber (CNTs/CF) hybrid material was prepared by ultrasonically assisted electrophoretic deposition (EPD). CF supports (CF without handling, CF oxidized by nitric acid, CNTs/CF hybrid material) were evaluated by sludge immobilization tests, bacterial cell adsorption tests and Derjaguin -Landau -Verwey -Overbeek (DLVO) theory. We found that the CNTs/CF hybrid material has a high capacity for adsorbing activated sludge, nitrifying bacterial sludge and pure strains (Escherichia coli and Staphylococcus aureus). CNTs deposited on CF surface easily wound around the curved surface of bacterial cell which resulted in capturing more bacterial cells. DLVO theory indicated the lowest total interaction energy of CNTs/CF hybrid material, which resulted in the highest bacteria cell adsorption velocity. Experiments and DLVO theory results proved that CNTs/CF hybrid material is a super support material for sludge biofilms.

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Optimizing carbon fibre supports for bioreactors by nitric acid oxidation and calcium ion coverage according to extended DLVO theory

Liu

Zhang

Bao³

et al. 2018

Environmental Technology

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Optimizing supports for microorganisms is required for bioreactors. Carbon fibres (CF) were employed as supports for microorganisms. To optimize CF supports for immobilizing bacterial cells, we used methods of nitric acid oxidation and calcium ion coverage. We evaluated the capacity of these CF supports (untreated CF, nitric acid oxidation CF and Ca-covered CF) via bacterial cell adhesion tests, based on extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory. The results implied that because of the high hamaker constants, oxidized CF supports had higher capacity in this regard than untreated CF supports. However, the growing oxygen groups increased the negative zeta potential of CF supports, thus likely to reduce their capacity, in accordance with XDLVO theory. Since the Ca coverage could decrease the negative zeta potentials of CF without reducing the hamaker constants, it could enhance the capacity of oxidized CF supports. We concluded that a combination of nitric acid oxidation and Ca coverage could increase the capacity of CF supports to immobilize bacterial cells.

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Mechanism of adhesion to activated sludge on carbon fiber at initial stage.

Cited by 5 publications

References 0 publications

Carbon Fiber as an Excellent Support Material for Wastewater Treatment Biofilms

Carbon Fiber as an Excellent Support Material for Wastewater Treatment Biofilms

Carbon nanotubes/carbon fiber hybrid material: a super support material for sludge biofilms

Optimizing carbon fibre supports for bioreactors by nitric acid oxidation and calcium ion coverage according to extended DLVO theory

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