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    Wyświetlanie 1-4 z 4
    Tytuł:
    Artificial neural network (ANN) modeling of COD reduction from landfill leachate by the ultrasonic process
    Autorzy:
    Arabameri, M.
    Javid, A.
    Roudbari, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/207474.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    COD
    neural network
    landfill leachate
    ultrasonic process
    ChZT
    sieć neuronowa
    odciek ze składowiska
    proces ultradźwiękowy
    Opis:
    In the study, the use of an artificial neural network (ANN) has been applied for the prediction of COD removal from landfill leachate by the ultrasonic process. The configuration of the backpropagation neural network giving the lowest mean square error (MSE) was a three-layer ANN with a tangent sigmoid transfer function (tansig) at a hidden layer with 14 neurons, linear transfer function (purelin) at the output layer and the Levenberg–Marquardt backpropagation training algorithm (LMA). The ANN predicted results are very close to the experimental data with the correlation coefficient (R2) of 0.992 and the MSE of 0.000331. The sensitivity analysis showed that all studied variables (contact time, pH, ultrasound frequency and power) have strong effect on COD removal. In addition, ultrasound power is the most influential parameter with relative importance of 25.8%. The results showed that modeling neural network could effectively predict COD removal from landfill leachate by ultrasonic process.
    Źródło:
    Environment Protection Engineering; 2017, 43, 1; 59-73
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    What were the reasons for the rapid landslide occurrence in “Piaseczno” open pit? – analysis of the landslide process
    Autorzy:
    Jakóbczyk, J.
    Cała, M.
    Stopkowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/178828.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    landslide
    open pit mine
    slope stability analysis
    numerical modelling
    Limit Equilibrium Method
    LEM
    Shear Strength
    Reduction Method
    SSRM
    Opis:
    Landslides are major natural hazards occurring in opencast mining. The problem of slope stability failure in the existing open pit mines as well as in those which are at a stage of technical closure is current issue in Poland and all over the world. This problem requires conducting in-depth and meaningful analysis which will identify the causes of processes characterized by a very rapid course and large extent. The paper presents the analysis of the landslide causes, which took place on May 11, 2011 on the western slope of the internal dump in “Piaseczno” sulphur mine (at a stage of technical closure). It was the first native sulphur open pit mine in Poland in which the exploitation was carried out from 1958 untill 1971. Reclamation works have been ongoing since 2005. The aim of these works is to create water body which will be used for recreational purposes. During the reclamation works on the western slope of “Piaseczno” reservoir the landslide processes were activated. A detailed description of geology and preliminary analyses of landslide processes are given in [1]. The development of landslide took place in a very violent manner. Moreover, the occurrence of the landslide caused the movement of the reservoir shoreline by about 350 meters and created a bay with the area of approximately 6 hectares. Displacement of 600 000 m3 of soil masses under the water resulted in its level rising by 56 cm. The total volume of ground masses was over 1 million m3. The analysis of the landslide process activation was carried out for two representative cross-sections of the internal dump. Numerical calculations were performed using the Limit Equilibrium Method (SLOPE/W GeoStudio) and the Finite Difference Method using the Shear Strength Reduction Method (FLAC Slope). They were aimed at determining the shape and extent of potential slip surface, which would correspond to the observed landslide. The purpose of the analysis, the results of which are presented in the article, was to define how the process proceeded and what factors contributed to its activation.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 1; 25-35
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composting and anaerobic digestion technologies as methods for reduction of virus transmission in the environment
    Autorzy:
    Ligocka, A.
    Paluszak, Z.
    Gut, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/208162.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    viruses
    waste treatment
    anaerobic digestion technology
    thermophilic fermentation
    virus transmission
    waste treatment process
    produkty uboczne fermentacji
    wirusy
    unieszkodliwianie odpadów
    technologia beztlenowa fermentacja
    kompostowanie
    proces fermentacji
    transmisja wirusa
    proces obróbki odpadów
    Opis:
    Survival of bovine enterovirus was studied in animal by-products subjected to sanitization processes. Composting technology and anaerobic digestion under mesophilic (37 °C) and thermophilic (55 °C) conditions were tested in terms of their effectiveness. Viruses were introduced into the biomass in the course of waste treatment processes and virus titres were determined at appropriate time intervals. Technology which allowed the most effective virus elimination, after 2 h, was thermophilic fermentation. During composting, bovine enterovirus survival ranged from 12 to 17 days, whereas the survival time for mesophilic fermentation was 28 days.
    Źródło:
    Environment Protection Engineering; 2016, 42, 2; 137-144
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of emission and reduction of greenhouse gases from upstream petrochemical industry in Thailand
    Autorzy:
    Kanchanapiya, P.
    Julapun, N.
    Limphitakphong, N.
    Pharino, C.
    Chavanparit, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/207793.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    greenhouse gases
    aromatic compounds
    energy conservation
    energy utilization
    fuel economy
    fuels
    olefins
    petrochemical plant
    petrochemicals
    petrochemical industry
    production process
    gazy cieplarniane
    związki aromatyczne
    oszczędzanie energii
    wykorzystanie energii
    zużycie paliwa
    paliwa
    olefiny
    zakłady petrochemiczne
    petrochemia
    przemysł petrochemiczny
    proces produkcji
    Opis:
    The study aimed to determine the baseline and indicators for the emission of greenhouse gases (GHG) and to evaluate the effectiveness of GHG mitigation measures in Thai upstream petrochemical plants. During 2005–2010, the upstream production had an annual demand for energy in the range of 110 000–150 000 TJ, ca. 5–6% of the total Thailand energy consumption. The proportion of energy consumption for producing olefin and aromatic products is 73 and 14%, respectively. The amount of GHG emissions equalled approximately 7–9 Mt CO2 eq. This represents a 3% portion of the total GHG emissions of Thailand, separating into the olefin and aromatic products, around 69 and 18%, respectively. The ratios of GHG emission came from fuel combustion of 59%, steam consumption (28%), electricity consumption (10%) and flare (3%). The carbon intensity of upstream products in the olefins and aromatics’ groups had the range of 1.125–1.309 and 0.518–0.667 t CO2 eq/t, respectively. It was likely that the carbon intensity during the period of 2005–2010 was lowered as the industry sector took measures to improve energy conservation and developed their production processes. The GHG mitigation measures by energy conservation were already implemented including fuel saving (67%), steam saving (23%) and electricity saving (10%).
    Źródło:
    Environment Protection Engineering; 2015, 41, 2; 31-46
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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