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    Wyświetlanie 1-2 z 2
    Tytuł:
    Simple and Combined Pretreatment of a Mixture of Forestry and Aromatic-Medicinal Plant Waste by Chemical, Physical and Enzymatic Methods
    Autorzy:
    Bendaoud, Ahmed
    Belkhiri, Abdelkhalek
    Maai, Mohamed
    Moubchir, Tarik
    Hmamou, Anouar
    Tlemcani, Sara
    Eloutassi, Noureddine
    Lahkimi, Amal
    Powiązania:
    https://bibliotekanauki.pl/articles/24201758.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    biomass
    lignocellulosic complex
    pretreatment
    cellulose
    plant waste
    Opis:
    Forestry waste (FW) extracted parts ofmedicinal-aromatic plant waste (EPW) and unused parts (UPW) are considered potential resources for energy recovery (their heating value of approximately 19 MJ/kg).In order to valorize lignocellulosic biomass, a pretreatment process is required to hydrolyze the recalcitrant lignocellulosic complex into fermentable simple sugars. The aim of this study is to determine the best method of pretreatment that takes into account treatment time, efficiency, and environmental friendliness. The mixture of FW, EPW, and UPW was treated by simple and combined treatment using different methods like acid sulfuric (Ac), steam explosion (SE), and enzymatic (E) (cellulase and hemicellulase).The results showed that the combined and simple Ac treatments are the mostefficient compared with SE and E treatments in the hydrolysis of polysaccharide of cellulose with a rate respectively of 90.5% and 77.6% and hemicellulose with a rate respectively of 80.63% and 87.14%. In addition, both of the preceding methods release an important rate of total phenolic compounds. Combined treatment demands high time but is friendly (approximately 1 day), and Ac treatment is less time-consuming (about 25 min) but harmful to the environment and causes the corrosion of equipment.In conclusion, combined treatment can be the best method and the high time required can be reduced with the progress of the research.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 4; 376--383
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy Metals Analysis and Quality Evaluation in Drinking Groundwater around an Abandoned Mine Area of Ouichane (Nador’s Province, Morocco)
    Autorzy:
    Moubchir, Tarik
    Eloutassi, Noureddine
    Bendaoud, Ahmed
    Belkhiri, Abdelkhalek
    Maai, Mohamed
    Moubchir, Majida
    Zahir, Ilham
    Powiązania:
    https://bibliotekanauki.pl/articles/24201772.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    contamination
    pollution index
    heavy metals
    water quality
    mining site
    Ouichane region
    Opis:
    The eventual polluting of the Ouichane region’s groundwater by heavy metals around an abandoned iron mine was investigated. To reach this aim, the research began with a questionnaire survey to assess local people’s use of and appreciation for well and spring water, followed by measurement of spatial pollution load of heavy metals: Al, Ag, Fe, Cd, As, Cr, Co, Zn, Pb and Cu for water samples collected from twelve wells and three spring drinks of water using inductively coupled plasma-atomic emission spectrometry method (ICP). Determining the overall quality of spring and well water for human use was also performed by calculating the heavy metal pollution index (HPI). As result, the survey revealed that 44.90% of the households are not connected to the drinking water network, 97.3% of them use well water, which is highly appreciated, and 88.1% of the population consider its quality to be good to excellent. Meanwhile, the ICP analysis showed that all the water samples contain heavy metals. In fact, the maximum concentrations (expressed in 10-5 g/l) recorded per element were 9.7 for (Ag), 15 for (Al), 6.9 for (As), 4.5 for (Cd), 5.6 for (Co), 31 for (Cr), 14 for (Cu), 858 for (Fe), 7 for (Pb) and 2.9*10-5 g/l for (Zn). Moreover, most of the water samples recorded heavy metal values above World Health Organization (WHO) limits, for at least one metal among the ten tested, with high concentrations of iron observed in all samples. The HPI values for the three explored sources (S1, S2 and S3) and for 8 out of 12 wells (P3, P4, P5, P6, P7, P8, P9 and P10) exceed the critical pollution value and identify non-potable water with a high potential of contamination. Consequently, the results of this study raise the question about groundwater around this abandoned mining area, especially in the long term, the use of groundwater could increase because of the succession of years of drought on Moroccan territory and hence may constitute a significant health risk for most of the inhabitants.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 5; 118--127
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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