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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of gas holdup on the efficiency of cyclonic-static microbubble flotation column for oily wastewater treatment
    Autorzy:
    Ning, K.
    Huang, G.
    Xu, H.
    Wu, L.
    Li, X.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/208139.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bubble columns
    efficiency
    flotation
    wastewater treatment
    oil water separation
    kolumna flotacyjna
    efektywność
    flotacja
    oczyszczanie ścieków
    separacja wody
    Opis:
    A cyclonic-static microbubble flotation column of a novel construction was used in oil-water separation fields and has high efficiency for oil-water separation. The gas holdup is a key parameter for the evaluation of the performance of a flotation column. The gas holdup, closely related to the bubble size, bubble velocity and superficial gas velocity, is one of the most important parameters characterizing the hydrodynamics of a bubble column. The effect of gas holdup in a cyclonic-static microbubble flotation column was investigated. In addition, several operating parameters such as the circulating pressure, superficial gas velocity, and frother consumption were also investigated. The gas holdup was positively correlated to the superficial gas velocity. The gas holdup of clean water and oil wastewater increased along with the increase of the frother consumption. The separation mechanism of cyclonic-static microbubble flotation column was analyzed.
    Źródło:
    Environment Protection Engineering; 2018, 44, 2; 5-17
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A polarization selective beam splitter based on a subwavelength multisubpart profile grating structure
    Autorzy:
    Xiao, Y.
    Huang, L.
    Wu, H.
    Sun, X.
    Xiao, W.
    Duan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174760.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    diffraction and gratings
    polarizing beam splitter
    PBS
    leaky-mode resonance
    LMR
    Opis:
    In this study, a polarization selective beam splitter constructed by only a single layer subwavelength multisubpart profile grating is presented. Rigorous coupled-wave analysis is adopted to investigate the properties of the structure. It is shown that for a transverse electric polarized wave, the device demonstrates very high reflectivity (>97%) from 1.46 to 1.58 μm; and for a transverse magnetic polarized wave, at the wavelength of 1.55 μm, it exhibits about 50/50 beam ratio under normal incidence. To evaluate the response of the polarizing beam splitters under variation in structure parameters, we also investigated the fabrication tolerances of the device.
    Źródło:
    Optica Applicata; 2016, 46, 4; 665-672
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient sulfidization of lead oxide at high temperature using pyrite as vulcanizing reagent
    Autorzy:
    Zheng, Y.-X.
    Lv, J.-F.
    Wang, H.
    Wen, S.-M.
    Huang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110351.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    lead oxide
    sulfidization roasting
    pyrite
    reaction mechanism
    TG
    Opis:
    A sulfidization roasting-flotation process was usually viewed to be effective in treating the refractory oxide ore. In this paper, pyrite was proposed to be applied as a potential vulcanizing reagent to transform PbO or its surface to PbS based on feasibilities of technology and economy. The evolution process, phase and characteristics of crystal growth were investigated by TG, XRD and SEM-EDS, respectively, to interpret the interaction mechanism of lead oxide and pyrite at high temperature. It was found that the decomposition process of pyrite under argon atmosphere was a slow process of sulfur released from FeS2 to FexS, which made the process easier to be controlled. When PbO was introduced into the system, the initial solid-solid (PbO-FeS2) reaction and prevailing solid-gas (PbO-S2(g)) reaction occurred at about 500 °C and 700 °C, respectively. Combined with the SEM-EDS analyses results, the optimal temperature for the sulfidization of PbO should be in the range of 700-750 °C.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 270-277
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic research of quinoline, pyridine and phenol adsorption on modified coking coal
    Autorzy:
    Sun, X.
    Xu, H.
    Wang, J.
    Ning, K.
    Huang, G.
    Yu, Y.
    Ma, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110365.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption kinetics
    modification
    coking coal
    coking wastewater
    Opis:
    Adsorption is widely used in wastewater treatment. In this work, the removal of quinoline, pyridine and phenol from coking wastewater by using modified coking coal, which was treated by four different modification methods i.e. acidification sodium hydroxide (5 mol/dm3), hydrochloric acid (5 mol/dm3) and acetic acid (5 mol/dm3) and low-temperature (105 oC) oxidation, was investigated. The modified coal was characterized by the surface area analysis, SEM, total acidity and basicity and FT-IR. The results showed that the surface area from high to low follows the order: modification with acetic acid, modification with hydrochloric acid, raw coal, modification with sodium hydroxide and modification with low-temperature. Experimental data were fitted to pseudo-first-order, pseudo-second-order and intra-particle diffusion. The adsorption of all followed pseudo-second-order kinetics. The result showed that the removal efficiency of coal modified by hydrochloric acid and acetic acid are higher than raw coal, while modified by sodium hydroxide and low-temperature are lower than raw coal., The coal modified by hydroxide acid had the best adsorption capacity.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 965-974
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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