Physicochemical properties and membrane biofouling of extra-cellular polysaccharide produced by a Micrococcus luteus strain

Feng, Lei; Li, Xiufen; Song, Ping; Du, Guocheng; Chen, Jian

doi:10.1007/s11274-014-1627-y

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…A difference was observed between the 2A1 and 2Sc biofilms and the control biofilms; the former were more robust than those of the controls (without hydrocarbon), despite containing the same salinities and being incubated at the same time and temperatures, but not the carbon source; as the amount of salt stress increased, the complex medium promoted greater biomass formation and, consequently, higher production of EPS [94] . Micrococcus has an extraordinary ability to produce EPS in a short period of time that can cause biofouling problems in a variety of environments [102] and the marine bacterial EPS influence the fate and ultimate degradation of hydrocarbon pollutants in the ocean, particularly during oil spills [103] . With regard to pH in this study, the lowest pH evaluated was 5 and the highest was 9 for Micrococcus biofilms; nevertheless, no significant effect was found for either strain.…”

Section: Resultsmentioning

confidence: 99%

Environmental stressor assessment of hydrocarbonoclastic bacteria biofilms from a marine oil spill

Zapata-Peñasco,

Avelino-Jiménez,

Mendoza-Pérez

et al. 2024

Biotechnology Reports

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Section: Resultsmentioning

confidence: 99%

Environmental stressor assessment of hydrocarbonoclastic bacteria biofilms from a marine oil spill

Zapata-Peñasco,

Avelino-Jiménez,

Mendoza-Pérez

et al. 2024

Biotechnology Reports

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“…The general mechanisms of fouling mitigation in BF-MBR were proven to be almost the same as in the MBR systems [31], which allows for assuming that the investigated content of the mixed liquor in MBR, represented by different research groups [50,51,[53][54][55], is also valid for the BF-MBR.…”

Section: The Working Hypothesis Implication Of the Findings Challenmentioning

confidence: 99%

Computational Thermodynamic Analysis of the Interaction between Coagulants and Monosaccharides as a Tool to Quantify the Fouling Potential Reduction in the Biofilm Membrane Bioreactor

Kulesha

Ratnaweera

2019

Water

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The membrane bioreactor (MBR) and the biofilm membrane bioreactor (BF-MBR) are among key solutions to water scarcity; however, membrane fouling is the major bottleneck for any expansion of these technologies. Prepolymerized aluminum coagulants tend to exhibit the greatest extent of fouling alleviation, with the reduction of soluble microbial products (SMPs) being among the governing mechanisms, which, nevertheless, has been poorly understood. This current study demonstrates that the investigation of the chemical coordination of monosaccharides, which are the major foulants in MBR and BF-MBR, to the main hydrolysis species of the prepolymerized aluminum coagulant, is among the key approaches to the comprehension of the fouling mitigation mechanisms in BF-MBR. Quantum chemical and thermodynamic calculations, together with the multivariate chemometric analysis, allowed the team to determine the principal mechanisms of the SMPs removal, understand the thermodynamic patterns of fouling mitigation, develop the model for the prediction of the fouling mitigation based on the thermodynamic stability of the inorganic-organic complexes, and classify these complexes into thermodynamically stable and less stable species. The results of the study are practically significant for the development of plant surveillance and automated process control with regard to MBR and BF-MBR systems.This gel layer is usually intertwined with the cake matrix, therefore it is highly complicated to distinguish either of them [9]. The formation of the cake layer, as well as the gel matrix at the membrane surface, are governed by the pressure-driven convective flow from the bulk mixed liquor solution to the membrane during filtration [7,9,10].Concentration polarization (CP) is the other type of solute fouling, which accompanies every filtration system, being, however, of marginal importance in the MBR/BF-MBR operation [9,11]. This phenomenon is entailed by the tendency of the solutes, rejected by the membrane, to accumulate at the membrane-solution interface within the concentration boundary region, driven by the concentration gradients, and to form a highly concentrated zone, called a concentration polarization layer. In contrast to the cake and gel layers, the transport within the concentration polarization region is diffusion, described by the Fick's first law [7,9,10]. The solids can diffuse back to the bulk mixed liquor in the CP layer, if they are not entrapped in the gel or cake layer. The concentration polarization model and the mechanisms and mathematical description of cake layer compaction are explained in detail by Yoon [12].Membrane pore blockage is mainly attributed to the accumulation of the solutes and colloids in the membrane pores and on the membrane surface, which comprises complete, internal, and intermediate pore blocking mechanisms. Membrane pore blockage, altogether with the cake filtration during the dead-end membrane filtration, was comprehensively described by Hermia's pore-blocking models, represented elsewhere [5,8,[13][1...

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Physicochemical properties and membrane biofouling of extra-cellular polysaccharide produced by a Micrococcus luteus strain

Cited by 2 publications

References 27 publications

Environmental stressor assessment of hydrocarbonoclastic bacteria biofilms from a marine oil spill

Environmental stressor assessment of hydrocarbonoclastic bacteria biofilms from a marine oil spill

Computational Thermodynamic Analysis of the Interaction between Coagulants and Monosaccharides as a Tool to Quantify the Fouling Potential Reduction in the Biofilm Membrane Bioreactor

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