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    Wyświetlanie 1-4 z 4
    Tytuł:
    Biological stability of water in water distribution systems. The effect of water treatment trials
    Autorzy:
    Wolska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206902.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water treatment
    carbon
    groundwater
    microorganisms
    nitrogen removal
    organic carbon
    surface waters
    water aeration
    water distribution systems
    water supply systems
    biological stability
    inorganic nitrogen
    uzdatnianie wody
    węgiel
    wody gruntowe
    mikroorganizmy
    usuwanie azotu
    węgiel organiczny
    wody powierzchniowe
    napowietrzanie wody
    systemy dystrybucji wody
    wodociągi
    stabilność biologiczna
    stężenie dwutlenku węgla
    azot nieorganiczny
    Opis:
    Research into the removal efficiency of biogenic substances, necessary for the growth of heterotrophic microorganisms, was carried out for the following water treatment trials: surface water, infiltrative water and mixed surface water after microsieving with aerated underground water. The results have shown that the efficiency of removal of organic substances, independently of the type of treated water, increased along with the organic carbon concentrations in raw water. The average effectiveness of phosphate removal was: 92.1%, 88.8% and 83.7% for surface, infiltrative and mixed water, respectively. In all analyzed systems, presence of phosphates was an limiting factor for the regrowth of microorganisms in the distribution system. In none of the water treatment trials, effective removal of inorganic nitrogen has been recorded.
    Źródło:
    Environment Protection Engineering; 2015, 41, 2; 147-157
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of UV irradiation on biodegradability of natural organic matter
    Autorzy:
    Wolska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/207943.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    organic carbon
    UV irradiation
    water treatment
    natural organic matters
    węgiel organiczny
    promieniowanie UV
    uzdatnianie wody
    naturalne substancje organiczne
    Opis:
    Changes in concentration of total organic carbon in natural organic matter during UV irradiation have been examined, and especially its biodegradable fraction. The studies have shown better effectiveness of elimination of organic substances for highly contaminated water than that obtained for pre-Treated water. UV irradiation assured the decrease of all fractions of total organic carbon, which indicates the domination of mineralization over the transformation of multi-molecular substances into simpler ones. This means that organic substances were mineralised during UV irradiation. The effective elimination of non-biodegradable dissolved organic substances absorbing UV radiation ensures a very large decrease in potential of disinfection of by-products.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 239-246
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing coagulant choice for treatment technology of surface water for human consumption
    Autorzy:
    Wolska, M.
    Mołczan, M.
    Urbańska-Kozłowska, H.
    Solipiwko-Pieścik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/208212.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    surface treatment
    water treatment
    coagulation
    uzdatnianie wody
    koagulacja
    uzdatnianie powierzchni
    Opis:
    Coagulation is a process commonly used in water treatment, especially for surface water. This process aims to effectively remove organic matter [1, 2] especially precursors of oxidation and disinfection by-products [3–5], whose creation potential is related to absorption values at 254 nm (UV254) [6] Due to a very large variability in surface water composition over the course of the year and different contamination levels dependent on water source location, it is important to optimally choose coagulant type and dosage. Such optimization is difficult due to the presence of a large number of coagulants on the market. Świderska-Bróż and Rak [7] and Lee et al. [8] have shown that prehydrolyzed coagulants are less sensitive to changes in temperature and pH of the input water than classic ones. Lin et al. [9] suggest however that the effectiveness of coagulation mainly depends on the type and structure of organic matters present in waters, and to a much lesser degree on pH and temperature.
    Źródło:
    Environment Protection Engineering; 2018, 44, 4; 131-141
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and characterization of ZnO-PMMA resin nanocomposites for denture bases
    Autorzy:
    Cierech, M.
    Wojnarowicz, J.
    Szmigiel, D.
    Bączkowski, B.
    Grudniak, A. M.
    Wolska, K. I.
    Łojkowski, W.
    Mierzwińska-Nastalska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/307186.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanocząstka ZnO
    Candida albicans
    polimery akrylowe
    ZnO nanoparticles
    acrylic resins
    Opis:
    Purpose: The aim of the paper was to investigate the antifungal activity of zinc oxide nanoparticles (ZnONPs) against Candida albicans. Some attempts have been made to find out the best way to introduce ZnONPs into polymethyl methacrylate (PMMA) resin material and to determine some parameters of a newly formed composite. Material and methods: Zinc oxide nanoparticles were manufactured and their basic physical parameters were determined (average particle size, density, specific surface area). Minimal inhibitory concentration (MIC) of ZnONPs was determined for the Candida albicans standard strain. The average size of ZnO conglomerates in the monomer solution of PMMA resin was measured using a dynamic light scattering instrument. PMMA resin samples with incorporated ZnONPs were produced. The morphology of nanopowder and the newly formed composite was examined under a scanning electron microscope (SEM). In addition, the roughness parameter of PMMA resin material was investigated before and after ZnONPs modification. Results: Nanopowder with the average particle size of 30 nm, density of 5.24 g/cm3 and surface area of 39 m2 /g was obtained. MIC was determined at the level of 0.75 mg/mL. The average size of ZnO conglomerates in the monomer solution of acrylic resin dropped by 11 times after ultrasound activation. SEM examination of a newly formed composite showed a successful introduction of ZnONPs confirmed by the energy dispersive X-ray spectroscopy (EDS) analysis. There were no statistically significant differences in the biomaterial roughness before and after the modification of ZnONPs. Conclusion: Zinc oxide nanoparticles were successfully incorporated into acrylic resin used for the production of denture bases. The presence of nanoparticles with sizes below 100 nm was confirmed. Nevertheless a newly created composite needs to be further investigated to improve its homogeneity, and to check its microbiological properties, strength and biocompatibility prior to its possible clinical use.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 31-41
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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