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    Wyświetlanie 1-3 z 3
    Tytuł:
    An empirical analysis of Malaysian palm oil export to world main palm oil importing countries : evidence from a panel cointegration model
    Autorzy:
    Hassan, Nur Ain Mohd
    Zakaria, Kalsom
    Salleh, Kamalrudin Mohamed
    Ahmad, Siti Mashani
    Powiązania:
    https://bibliotekanauki.pl/articles/2204095.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    panel cointegration
    FMOLS
    palm oil export
    Granger causality
    Opis:
    The paper explores the long-term causal relationships of Malaysian palm oil exports with the real effective exchange rate of the respective importing countries, palm oil consumption, vegetable oil production, and GDP growth. The study applied panel cointegration and causality approaches based on data from 10 main palm oil importing countries between 2004 and 2018. The impacts of economic growth, the effective real exchange rate, and the production of other vegetable oils by the main palm oil importing countries on Malaysian palm oil exports were found to be negative. However, palm oil consumption by the main palm oil importers was found to be a statistically significant positive determinant of Malaysian palm oil exports. This finding indicates that consumption has a direct positive effect on the demand for exports. A panel Granger causality analysis revealed a unidirectional causality between importing countries’ production of other vegetable oils and Malaysian exports of palm oil.
    Źródło:
    Operations Research and Decisions; 2023, 33, 1; 61--73
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorptive removal of colour pigment from palm oil using acid activated nteje clay. Kinetics, equilibrium and thermodynamics
    Autorzy:
    Ajemba, R. O.
    Onukwuli, O. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/110649.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption
    kinetics
    isotherm
    activation
    colour pigment
    palm oil
    bleaching
    Opis:
    The kinetics of colour pigment removal from palm oil using acid activated clay from Nteje has been investigated. To determine the equilibrium adsorption capacity, the effects of temperature, contact time, adsorbent dosage and particle size were studied. The experimental adsorption data were analyzed using pseudo-first order, pseudo-second order, and Elovich kinetic models. The pseudo-second order model fitted very well to the kinetic experimental data. Equilibrium isotherms were analyzed by Lang-muir and Freundlich adsorption models. The data was in line with the Freundlich isotherm indicating a monolayer adsorption. The activation energy was calculated as 12 kJ/mol, and other thermodynamic parameters were determined as ΔS° = 0.063 J/mol, ΔH° = –34.994 J/mol, and ΔG° = –58.606 kJ/mol. These values indicate that the adsorption of colour pigment from palm oil onto acid activated clay was exothermic and can be attributed to physico-chemical adsorption process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 1; 369-381
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the effluent polishing plant using a ultrafiltration membrane installed at a palm oil mill
    Autorzy:
    Abdul Hadi, Numan
    Hawari, Yahaya
    Ngatiman, Muzzammil
    Jalani, Nor Faizah
    Wahab, Noorshamsiana Abdul
    Halim, Rohaya Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/208299.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    BOD
    palm oil mill
    wastewater treatment
    ultrafiltration membranes
    BZT
    olej palmowy
    oczyszczanie ścieków
    membrany ultrafiltracyjne
    Opis:
    Palm oil mills discharge raw effluent with high biochemical oxygen demand (BOD) of about 25 000 mg O2/dm3 . Conventional effluent treatment system uses ponds with a long hydraulic retention time of about 55–85 days, but the reduction of BOD is usually halted at 100–250 mg O2/dm 3. Further reduction of BOD to below 20 mg O2/dm3 to meet regulation requirement needs further advanced treatment. This study evaluates the efficiency of an effluent polishing plant installed at a palm oil mill targeting final effluent BOD below 20 mg O2/dm3. Characteristic of the incoming and treated effluent, dissolved oxygen in the aeration ponds and the effluent flow rate of the treatment plant have been determined. Due to low process throughput at the mill, the polishing plant operated at only 60% of its designed capacity. Treatment of effluent showed reduction of BOD from 39.3±5.8 to 6.1±3.8 mg O2/dm3, i.e., a reduction by 80–94%. Colour – a newly proposed regulation parameter – was reduced from 1081±69 to 845±60 ADMI, i.e., by 11–30%. This study indicates that while the treatment of effluent to reduce the BOD to below 20 O2/dm3 O2/dm3 is feasible, reduction of colour to less than 100 ADMI is not achievable.
    Źródło:
    Environment Protection Engineering; 2019, 45, 1; 155-170
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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