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    Wyświetlanie 1-3 z 3
    Tytuł:
    Application of biological method for removing selected heavy metals from sewage sludge
    Autorzy:
    Willner, Joanna
    Fornalczyk, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/109353.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bioleaching
    sewage sludge
    copper
    zinc
    Acidithiobacillus
    Opis:
    The aim of the study was to evaluate the application of bioleaching technique to reduce content of selected heavy metals (Zn, Cu) in sewage sludge, and hence to indicate possibilities for metals recovery from this type of waste. Bioleaching experiments were carried out with mixed bacteria Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, using leaching media: ferrous sulfate with different concentrations of Fe2+ (2 g/dm3 and 9 g/dm3) and sulfuric acid (VI). Dynamics of the increase in zinc concentration in biological systems was almost identical for both 9 g Fe2+/dm3 and 2 g Fe2+/dm3 in samples. However, higher values of Cu concentration were achieved using a medium with iron(II) salt 9 g/dm3 than in a 2 g/dm3 solution. Bioleaching with 9 g Fe2+/dm3 allowed for a nearly 20-fold reduction of zinc content and a 2-fold reduction in copper content in sewage sludge. Using 9 g/dm3 ferrous sulfate bioleaching could dissolve 94.8% Zn and 58.9%, whereas chemical leaching dissolved 47.3% Zn and 4.2% Cu.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 2; 387-395
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards a viable method of reusing silicon carbide. Physicochemical analyses in the studies on the industrial application of the material
    Autorzy:
    Niemczyk-Wojdyla, Anna
    Fornalczyk, Agnieszka
    Willner, Joanna
    Zawisz, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/2032847.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silicon carbide
    X-ray spectroscopy
    Acheson process
    węglik krzemu
    spektroskopia rentgenowska
    proces Achesona
    Opis:
    The paper presents an investigation on the feasibility of recovery of the highly valuable silicon carbide (SiC) from the slurry waste generated from silicon wafer production in the photovoltaic and semiconductor industry. Compared to the other techniques of recycling, a facile and low-cost method of waste treatment via heat drying followed by low-energy mixing in a shaker mixer was proposed. As the result of the treatment, the slurry waste was converted into a powdered form with dominant content of SiC. Separated SiC material was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray powder diffraction, and sieve analysis. In addition, analyses of the bulk density, moisture content and melting test were carried out. As was confirmed by the physicochemical analyses, the dominant sieve fraction was in the range of 0.1-0.06 mm, the purity level was a minimum 99% mass of SiC, the moisture content - 0.3%, the bulk density - 1.3 g/cm3. The physicochemical characteristics of the material were crucial for understanding the material performance, assessment of the material quality and determining the perspective directions of the industrial application. The studies revealed that the material exhibited a high application potential as abrasive, especially in abrasive grinding and waterjet cutting.
    Źródło:
    Environment Protection Engineering; 2021, 47, 4; 43-52
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LCD panels bioleaching with pure and mixed culture of Acidithiobacillus
    Autorzy:
    Willner, Joanna
    Fornalczyk, Agnieszka
    Saternus, Mariola
    Sedlakova-Kadukova, Jana
    Gajda, Bernadeta
    Powiązania:
    https://bibliotekanauki.pl/articles/2146845.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bioleaching
    aciditiooxidans
    ITO
    indium
    tin
    LCD panels
    recovery
    Opis:
    The influence of pure and mixed culture of A. ferrooxidans and A. tiooxidans as well as different pulp density (1 and 2%) of LCD panels on the In and Sn bioleaching efficiency was investigated. Pulp density is one of the factors affecting the metals extraction efficiency during biological leaching. It has been shown that lower pulp density results in higher indium and tin dissolution. The A. ferrooxidans bioleaching system showed better metal extraction results than A. thiooxidans, especially for tin, indicating the special role of iron and A. ferrooxidans in tin recovery. The highest leaching rate of both indium (94.7%) and tin (98.2%) was obtained using iron and sulfur medium inoculated with mixed bacteria and a pulp density of 1% w/v.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 15--23
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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