Enhancement of the biofilm formation on polymeric supports by surface conditioning

Hadjiev, D.; Dimitrov, Dimitar; Martinov, M.; Sire, Olivier

doi:10.1016/j.enzmictec.2006.06.022

Cited by 75 publications

(36 citation statements)

References 22 publications

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“…It must be noticed that the surface energy characteristics are not directly related to the nature of the material: for example, the gamma value of PE used in this study (39.8 mJ m À2 ) is closer to the gamma value of PP (35.6 mJ m À2 ) than to a PE used by Van Oss (33 mJ m À2 ) (Van Oss, 1994). In comparison with bibliography data (Van Oss, 1994;Hadjiev et al, 2007), it can be concluded that values of surface energy are not determined by the nature of the polymer.…”

Section: Measurement Of Surface Energymentioning

confidence: 92%

Influence of support material properties on the potential selection of Archaea during initial adhesion of a methanogenic consortium

Habouzit

Gévaudan

Hamelin

et al. 2011

Bioresource Technology

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Section: Measurement Of Surface Energymentioning

confidence: 92%

Influence of support material properties on the potential selection of Archaea during initial adhesion of a methanogenic consortium

Habouzit

Gévaudan

Hamelin

et al. 2011

Bioresource Technology

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“…Recent results [6][7][8][9] have shown that some fibrous materials are suitable for aerobic fixed bed reactor (AFBR) packing, especially in so far as they provide high specific surface for microbial attachment, high porosity, and relatively low pressure drop. The cells are immobilized on an inert fibrous matrix, loosely convoluted in a column.…”

Section: Introductionmentioning

confidence: 99%

Gas‐Liquid Mass Transfer in Fibrous Bed Reactor with Counter‐Current Liquid Recycle

Martinov¹,

Hadjiev²,

Vlaev

2009

Chem Eng & Technol

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In this work, the gas-liquid mass transfer in a lab-scale fibrous bed reactor with liquid recycle was studied. The volumetric gas-liquid mass transfer coefficient, k L a, is determined over a range of the superficial liquid velocity (0.0042-0.0126 m.s ), surface tension (35-72 mN/m), and viscosity (1-6 mPa.s). Increasing fluid velocities and viscosity, and decreasing interfacial tension, the volumetric oxygen transfer coefficient increased. In contrast to the case of co-current flow, the effect of gas superficial velocity was found to be more significant than the liquid superficial velocity. This behavior is explained by variation of the coalescing gas fraction and the reduction in bubble size. A correlation for k L a is proposed. The predicted values deviate within ± 15 % from the experimental values, thus, implying that the equation can be used to predict gas-liquid mass transfer rates in fibrous bed recycle bioreactors.

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“…The treatment of wastewater in packed bed bioreactors using immobilized cells is receiving more attention with the application of different immobilization methods and a variety of carriers [70-72, 177, 207-212]. Compared to conventional free cell systems, the bioreactors with immobilized cells have shown better results in terms of reactor productivity and ability to withstand extreme environments [213,214]. In the immobilized bioreactor systems, various support media such as granular activated carbon, polyurethane foam, and ceramics are used to enhance the performance of immobilized cells on a long term basis.…”

Section: Practical Considerations and Future Outlookmentioning

confidence: 99%

Bioaugmentation of Azo Dyes

Khalid

Arshad

Crowley

2010

The Handbook of Environmental Chemistry

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Biodegradation is a cost-effective method to remove the residues of azo dyes prior to their discharge in wastewater streams from dye product industries. The efficacy of this treatment method is highly dependent on establishing an effective degrader community and maintaining environmental conditions that support the growth and activity of the degrader organisms. Although activated sludge is commonly used as a source of degrader organisms to start the process, bioaugmentation of the wastewater with highly effective strains provides a much more reliable process in which the process manager can use bacterial strains that target particular dye chemicals and metabolites to achieve complete mineralization. The most effective inoculants are able to degrade dyes over a broad concentration range, tolerate a range of environmental conditions of temperature, pH, and salinity, and persist at high population densities in competition with other microorganisms in mixed microbial cultures. The use of growth supplements such as yeast extract can further enhance the biodegradation activity. The ability to achieve complete mineralization of azo dyes depends on the control of the process in which initial decolorization takes place under microaerophilic conditions with low oxygen, followed by elimination of the dye metabolites using an aeration step. In many cases, this may be best achieved by using a mixture of bacterial strains that sequentially carry out the two-step process. Practical development of bacteria for bioaugmentation requires careful screening that is based not only on their efficacy in pure culture, but also on their ability to compete with the indigenous microbial communities in wastewater streams and ability to be produced and delivered as a stable inoculum. In the future, it may be useful to consider bioaugmentation with bacteria that contain mobile genetic elements that carry catabolic pathways, thereby allowing the genes to be introduced into the indigenous microorganisms. The ability to monitor introduced bacteria or catabolic genes will continue to be important for process optimization both in the laboratory and during operation in fullscale treatment systems.

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Enhancement of the biofilm formation on polymeric supports by surface conditioning

Cited by 75 publications

References 22 publications

Influence of support material properties on the potential selection of Archaea during initial adhesion of a methanogenic consortium

Influence of support material properties on the potential selection of Archaea during initial adhesion of a methanogenic consortium

Gas‐Liquid Mass Transfer in Fibrous Bed Reactor with Counter‐Current Liquid Recycle

Bioaugmentation of Azo Dyes

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