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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of acid buffering capacity on the remobilization of heavy metals in sewage sludge barrier for tailings
    Autorzy:
    Chen, Y.
    Zhang, H.
    Ju, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/205048.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sewage sludge
    heavy metals
    acid mine drainage
    acid buffering capacity
    remobilization
    Opis:
    Remobilization of heavy metals from the bottom liner system due to the seepage of acid mine drainage (AMD) is an important concern in the long-term management of tailing impoundment. Titration tests were carried out to evaluate the acid buffering capacity (ABC) of sewage sludge and to investigate its effect on the remobilization of heavy metals. Test results demonstrate that the ABC increases with solid/liquid ratio and anaerobic incubation time and it is mainly attributed to the abundant organic matters contained and increasing carbonate loads. The added heavy metals (Zn, Pb, and Cu) were well immobilized during the anaerobic incubation stage but were released out dramatically during the acidification especially when pH drops below 6.0 because of dissolution of carbonates and cation exchange of clay minerals. The calculated results, from a simplified model, indicate that high levels of remobilization of heavy metals are not expected during the typical management time because of the high ABC of compacted sewage sludge barrier. These results support that sewage sludge is a suitable bottom liner material for the management of AMD from tailings.
    Źródło:
    Archives of Environmental Protection; 2018, 44, 2; 62-72
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing soil environmental capacity on different land uses in a suburban area of Chengdu, China
    Autorzy:
    Yang, W.-L.
    Zhou, W.-Y.
    Wan, W.-X.
    Gou, S.-Z.
    Zhang, J.
    Deng, S.-H.
    Shen, F.
    Wang, Y.-J.
    Yang, H.
    Luo, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/207670.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    China
    soil pollution
    heavy metals
    soil
    vegetables
    Chiny
    zanieczyszczenie gleby
    metale ciężkie
    gleba
    warzywa
    Opis:
    Wenjiang (China) is the area which undertakes high-intensity planting activities. Additionally, the soil environmental capacity has been a hot area of research as it plays a key role in environmental protection planning, environmental impact assessment and sustainable development. In this paper, the static model of soil environmental capacity is employed to investigate the distribution of residual soil environmental capacity in Wenjiang. The results show that the soil environmental capacity of mercury is the largest for industrial land while it is the lowest in garlic-rice planting areas; the soil environmental capacity of arsenic is the largest in city construction land while it is the lowest in ecological conservation zone; the soil environmental capacity of lead is the largest in city construction land while it is the lowest in garlic-rice planting areas; and the soil environmental capacity of chromium is the largest in city construction land while it is the lowest in garlic-rice planting areas.
    Źródło:
    Environment Protection Engineering; 2019, 45, 2; 55-67
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the breakthrough phenomena during heavy metal elution from a column packed with municipal waste incineration ash
    Autorzy:
    Zhang, W.
    Yang, Y.
    Suganuma, H.
    Kato, S.
    Suzuki, S.
    Kojima, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/206904.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcium compounds
    dissolution
    heavy metals
    leaching
    particle size
    związki wapnia
    rozpuszczanie
    metale ciężkie
    ługowanie
    wielkość cząstek
    Opis:
    At some point during acid leaching column tests of heavy metals from municipal waste incineration ash, sudden and rapid elution of harmful elements was observed which was called the breakthrough (BT) phenomena. The mechanism was elucidated from the results of measurement of elemental and particle size distribution in the column and batch leaching tests as follows. At the first stage of experimental runs, CaCO3 was dissolved in acidic solution and pH profile along the bed is formed. Some of the minor elements of Zn and Al dissolved by acid at the upper part of the column are precipitated at bottom of the column, leading to the reduction of flow rate of the leachate solution. After leachate pH becomes low by the termination of dissolution of Ca, these deposits are dissolved and thus, the flow rate increases. Most of the trace elements behave as such, which causes the increase of harmful element concentrations in the eluate. Some drastic concentration increase of harmful elements in leachate may occur even after the long period of pseudo stable dissolution behavior in the land-fill site.
    Źródło:
    Environment Protection Engineering; 2018, 44, 3; 63-78
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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