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New model of the sedimentation process of polydisperse post-coagulation suspension

Mariusz Rząsa Ewelina Łukasiewicz
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e139004 | DOI: 10.24425/bpasts.2021.139004
Keywords sedimentation modelling polydisperse suspension iterative model
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Abstract

Coagulation is a process during which a flocculent suspension may sediment. It is characterized by its polydisperse structure. There are three main fractions of sedimentation particles after coagulation: spherical, non-spherical and porous agglomerates. Each of the fractions sediments in a different manner, for different forces act on them, due to interactions between the particles, inhibition or entrainment of neighboring particles. The existing sedimentation models of polydisperse suspension do not consider the flocculation process, i.e. the change of one particle into another during sedimentation, resulting from their agglomeration. The presented model considers the shape of particles and flocculation, which is a new approach to the description of the mathematical process of sedimentation. The velocity of sedimentation depends on the concentration of particles of a given fraction in a specific time step. Following the time step, the heights of individual fractions are calculated. Subsequently, new concentration values of individual fractions are determined for the correspondingly reduced volume of occurrence of a given fraction in the volume analyzed, taking particle flocculation into consideration. The new concentration values obtained in this way allow to recalculate the total sedimentation rates for the next time step. Subsequent iterations allow for numerical simulation of the sedimentation process.
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Authors and Affiliations

Mariusz Rząsa
1
ORCID: ORCID
Ewelina Łukasiewicz
2
ORCID: ORCID
  1. Department of Computer Science, Opole University of Technology, ul. Oleska 48, 45-052 Opole, Poland
  2. Department of Thermal Engineering and Industrial Facilities, Opole University of Technology, ul. St. Mikołajczyka 5, 45-271 Opole, Poland

Molecular-mass distribution of humic substances from Arctic soils according to size exclusion chromatography

Evgeny Lodygin Roman Vasilevich
Polish Polar Research | 2020 | vol. 41 | No 4 | 271-287 | DOI: 10.24425/ppr.2020.134792
Keywords Arctic Vorkuta polydispersity permafrost tundra humic acids fulvic acids
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Abstract

Humic substances are polydisperse mixtures of structurally complex matters with different molecular weights. The complexity of molecular composition of humic substances is reflected through their physical and chemical properties and results in diverse interactions both with inorganic components and living organisms. The correlation of the molecular composition of humic and fulvic acids and their molecular weight distribution were analyzed by means of CP/MAS 13C NMR spectroscopy and size exclusion chromatography. Humic acids are a dynamic system containing macromolecular, oligomeric and low-molecular components. Fulvic acids are a monodisperse mixture of relatively low-molecular (up to 2 kDa) organic compounds. A significant correlation between the content of high and medium weight molecular fractions with labile fragments and low molecular weight fractions with hydrophobous fragments of humic acids has been revealed.

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Authors and Affiliations

Evgeny Lodygin
Roman Vasilevich

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