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    Wyświetlanie 1-2 z 2
    Tytuł:
    Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling
    Autorzy:
    Sedlakova-Kadukova, J.
    Marcincakova, R.
    Mrazikova, A.
    Willner, J.
    Fornalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351340.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bioleaching
    e-waste
    acidophilic bacteria
    iron
    Opis:
    The role of iron in metal-bearing waste bioleaching was studied. Four various types of waste (printed circuit boards (PCBs), Ni-Cd batteries, alkaline batteries and Li-ion batteries) were treated by bioleaching using the acidophilic bacteria A. ferrooxidans and A. thiooxidans (separately or in mixture). Role of main leaching agents (Fe3+ ions or sulphuric acid) was simulated in abiotic experiments. Results showed that oxidation abilities of Fe3+ ions were crucial for recovery of Cu and Zn from PCBs, with the efficiencies of 88% and 100%, respectively. To recover 68% of Ni from PCBs, and 55% and 100% of Ni and Cd, respectively, from Ni-Cd batteries both oxidation action and hydrolysis of Fe3+ were required. The importance of Fe2+ ions as a reducing agent was showed in bioleaching of Co from Li-ion batteries and Mn from alkaline batteries. The efficiency of the processes has increased by 70% and 40% in Co and Mn bioleaching, respectively, in the presence of Fe2+ ions. Based on the results we suggest the integrated biometallurgical model of metal-bearing waste recycling in the effort to develop zero-waste and less energy-dependent technologies.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1459-1466
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ temperatury, intensywności mieszania oraz napowietrzania na efektywność procesu bioługowania metali z wybranych odpadów przemysłowych
    Impact of the temperature, mixing intensity and aeration on the effectiveness of metal bioleaching from selected industrial wastes
    Autorzy:
    Andrzejewska-Morzuch, D
    Karwowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819333.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    acidophilic bacteria
    microorganisms
    viability
    ecology
    solids
    iron
    sewage sludge
    Opis:
    In the research work the influence of temperature, mixing intensity and aeration on heavy metals release from two types of industrial heavy metal containing wastes - combustion ash and galvanic waste - was analyzed. The bioleaching process was carried out using the culture based on the activated sludge as a source of active, sulphur-oxidizing microflora. The presence of Acidithiobacillus thiooxidans bacteria was proved using PCR technique. The culture was initially adapted to the growth in presence of 1% sulphur, up to the moment it achieved pH 1-2. The experiment was carried out in four variants, with different process parameters: temperature 22 degrees C, mixing 125 rpm, without aeration; temperature 22 degrees C, mixing 50 rpm, without aeration; temperature 37 degrees C, mixing 125 rpm, without aeration; temperature 22 degrees C, mixed and aerated with compressed air. After 14 days the amount of heavy metals released from the wastes was determined using ASA method to evaluate the process effectiveness in different experimental conditions. Mean value, standard deviation and variation coefficient was calculated. The effectiveness of heavy metals removal from the ash was significantly higher than the galvanic sludge bioleaching, in which only cadmium and chromium was effectively released (with the average effectiveness of 14.8-47.8% of Cd and 12.5-90,6% of Cr, depending on the experimental variant). In case of the combustion ash, the average removal efficiencies were: 1.1-22% of Zn, 04-12.3% of Cu, 2.8-19.7% of Pb, 3.4-6.7% of Cd, 2.8-52.2% of Ni and 43.8-87.4% of Cr, depending on process parameters. The increase of temperature from 22 to 37 degrees C resulted in the increased effectiveness of almost all metals from both tested wastes. Cadmium was the only metal that was leached better in 22 degrees C. In case of galvanic waste, Cd was released more effectively in cultures with mixing intensity of 125 rpm, and in the culture without aeration, while the aeration was favorable to Cr release. For the ash the additional aeration increased the removal of Cu, Cd, Ni and Cr. Copper, lead, nickel and chromium were released effectively using the 50 rpm mixing but zinc - in 125 rpm. The influence of the mixing intensity on cadmium bioleaching from the ash was not observed. The research indicated that the influence of tested parameters depended on the type of the waste as well as the kind of the metal. It is probably influenced by the other factors like the form of the metal in the waste, that should be a subject of further investigations.
    Źródło:
    Rocznik Ochrona Środowiska; 2012, Tom 14; 623-631
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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