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    Wyświetlanie 1-4 z 4
    Tytuł:
    Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed
    Autorzy:
    Tomczak, E. T.
    Kamiński, W. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185117.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    algorytm genetyczny
    jony metali ciężkich
    klinoptylolit
    heavy metal ions
    clinoptilolite
    sorption dynamics
    genetic algorithm
    Opis:
    In the last decade a growing interest was observed in low-cost adsorbents for heavy metal ions. Clinoptilolite is a mineral sorbent extracted in Poland that is used to remove heavy metal ions from diluted solutions. The experiments in this study were carried out in a laboratory column for multicomponent water solutions of heavy metal ions, i.e. Cu(II), Zn(II) and Ni(II). A mathematical model to calculate the metals' concentration of water solution at the column outlet and the concentration of adsorbed substances in the adsorbent was proposed. It enables determination of breakthrough curves for different process conditions and column dimensions. The model of process dynamics in the column took into account the specificity of sorption described by the Elovich equation (for chemical sorption and ion exchange). Identification of the column dynamics consisted in finding model coefficients [beta], KE and Deff and comparing the calculated values with experimental data. Searching for coefficients which identify the column operation can involve the use of optimisation methods to find the area of feasible solutions in order to obtain a global extremum. For that purpose our own procedure of genetic algorithm is applied in the study.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 1; 103-116
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamika sorpcji barwnika Direct Orange 26 na sorbencie roślinnym - kolbach kukurydzy
    Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent
    Autorzy:
    Tomczak, E.
    Blus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/126313.pdf
    Data publikacji:
    2015
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    barwnik azowy
    kolby kukurydzy
    dynamika sorpcji
    kolumna adsorpcyjna
    azo dye
    corncobs
    sorption dynamics
    fixed-bed column
    Opis:
    W pracy prowadzono badania dla układu barwnik azowy - sorbent roślinny. Barwnik azowy Direct Orange 26 pochodził z Zakładu Boruta-Zachem Kolor Sp. z o.o. Jako biosorbentu użyto modyfikowanych chemicznie granulowanych kolb kukurydzy. Wykonano eksperymenty w kolumnie, kontrolując w czasie zmiany stężenia barwnika w roztworze i sorbencie. Wyznaczono krzywe przebicia w zależności od stężenia początkowego roztworu, objętościowego natężenia przepływu i wysokości złoża. Na tej podstawie dokonano opisu matematycznego dynamiki sorpcji w oparciu o model prezentowany w literaturze. Stwierdzono możliwość wykorzystania kolb kukurydzy jako obiecującego materiału sorpcyjnego.
    The azo dye and plant derived sorbent system was investigated in this paper. Direct Orange 26 dye was acquired from Boruta-Zachem Kolor Sp. z o.o. Corncobs obtained from Chipsi Mais Germany were used as the biosorbent. The changes in the dye and sorbent concentrations with time were measured and used for further calculations. The experiments were carried out in a laboratory fixed-bed column. Sorption dynamics were described by a model presented in the literature. It was found that corncobs can be used as a promising sorbent material.
    Źródło:
    Proceedings of ECOpole; 2015, 9, 1; 347-356
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studying the Efficiency of Treatment Model Mixtures of Petroleum Products with the Modified Sorbent Made of Ash-and-Slag During Dynamic Sorption
    Autorzy:
    Korotkova, Tatyana Germanovna
    Bushumov, Svyatoslav Andreevich
    Ksandopulo, Svetlana Yurevna
    Solonnikova, Nataliya Vladimirovna
    Powiązania:
    https://bibliotekanauki.pl/articles/123373.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ash and slag
    thermal power plant
    sorbent
    sorption dynamics
    efficiency
    petroleum products
    extraction
    Opis:
    Experimental studies on the dynamic sorption of model mixtures containing petroleum products were performed. The subject of the study was the modified sorbent from the ash-and-slag wastes accumulated in the ash dump of the Novocherkassk State District Power Plant (SDPP) (Russia, Novocherkassk, Rostov Region), obtained using the method of ash removal. The quantity of the sorbent for each model solution was fixed at 5.0 g. The model solutions in the amount of 1 dm3 were passed through a column filled with the modified sorbent at constant filtration rate w = const with filtrate takeout of 0.1 dm3/min. The pH value of the solution, which is advisable for extracting petroleum products, was determined experimentally. For this purpose, the model solutions, containing 100 mg/dm3 of petroleum products with pH = 1.65, 4.01, 6.86, 8.12, 9.18, and 11.34, were prepared. The optimum pH value of the solution was considered pH = 7.5. The content of petroleum products in the filtrate in all experiments was determined using IR spectrometry. The working range of water pollution with petroleum products was determined on a series of model solutions containing petroleum products in the range between 0.5 and 10 mg/dm3 with the increment of 0.5, between 10 and 100 mg/dm3 with the increment of 10, and between 100 and 1,000 mg/dm3 with the increment of 100. The maximum extraction of petroleum products from the solution was 88.23%. The applicability of the Henry’s law to the range of petroleum products concentrations in the filtrate of 50 mg/dm3 was confirmed. The adsorption equilibrium constant (Henry’s law constant) was determined experimentally. The effect of the natural freshwater matrix on the degree of petroleum products extraction was studied; no significant effect on petroleum products sorption was found. A conclusion was made that the sorbent can ensure the efficiency of water purifying from petroleum products of no less than 85% in the range of pollution between 5 and 300 mg/dm3.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 11; 202-209
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of competitive sorption of heavy metal cations in mineral soils
    Autorzy:
    Gaszczyk, R
    Muszynski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401867.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    mineral soil
    Orthic Luvisol
    weakly loamy sand
    competitive sorption
    soil
    metal cation
    loess
    grey-brown podzolic soil
    dynamics
    heavy metal
    Opis:
    Model research on competitive sorption of heavy metal cations (Cu2+ , Zn2+ , Ni2+ ,Co2+ , Cd2+ and Cr3+ ) with Ph2+cations was carried out in the followingmineral soils: grey-brown podzolic derived from loess (Orthic Luvisols)using a dynamic method.Investigation on the course and the range of the sorption from the two- component solutions allowed to determine mobility of individual heavy metal cations in relation to lead (II) cations.At the same time, it allowed to evaluate their phyto-availability. Elements, which most easily entered sorptive complexes of both of the investigated soils were copper (II) and chrominium (III) cations. The rest of the cations showed different energy levels of entrance with simultaneous sorption with lead (II) cations. During competitive sorption of heavy metal cations, i.e. at saturation the columns with two component solution, the presence of the second, opposite process namely desorption of the following cations from the soil:Co2+ , Zn2+ , Ni2+ , and Cd2+ was observed. Desorption levels were characteristic for particular cations and depended on the type of soil.
    Źródło:
    Acta Agrophysica; 2000, 35; 69-76
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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