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Browsing by Author "Benrachedi, Khaled"

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    Contribution à l’évaluation de la pollution de l’air par les métaux lourds à Alger, zone de Bab El Oued
    (2009) Belamri, Mohamed; Benrachedi, Khaled
    Le travail réalisé dans cette étude consiste à analyser la qualité de lʼair dans la capitale. Un échantillonneur à faible débit dʼair a été utilisé pour la collecte des échantillons au niveau du quartier de Bab El Oued caractérisé par la présence dʼun hôpital et dʼun incinérateur de déchets médicaux ainsi que par la forte densité de la circulation automobile. Les aérosols ont été prélevés à 3 m du sol en mode matière particulaire en suspension (TSP). Les échantillons sont dosés par la méthode dʼanalyse XRF (X-Rays Fluorescence). Les résultats expérimentaux montrent que la teneur journalière en TSP dépasse la valeur cible (50 μ g/m 3 ). Les TSP sont responsables du transport des métaux lourds reconnus toxiques tels que le Cd, Pb, Cr et Ni
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    Modification of bitumen performances by incorporating on ethylene vinyl-acetate-based ozonized waste
    (Taylor & Francis, 2008) Benrachedi, Khaled; Fahimi, Akbar; Fargere, Thierry; Delmas, Michel; Gaset, Antoine
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    Valorization of peach stones to high efficient activated carbon : synthesis, characterization, and application for Cr(VI) removal from aqueous medium
    (Taylor & Francis, 2018) Khemmari, Fariza; Benrachedi, Khaled
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    Valorization of sawdust using Biological denirification of synthetic nitrates-contaminated ground water
    (Research Journal of Chemistry and Environment, 2018) Boumechhour, Fatima; Benbelkacem, Ouerdia; Ben Lefki, Rabah; Berrehal, Ahmed; Asselah, Amal; Benrachedi, Khaled; Bouchemal, Naima
    Nitrate pollution in receiving waters has become a serious issue worldwide. In Algeria, underground water pollution by nitrates has become alarming. Globally, denitrification is commonly employed in biological nitrogen removal processes to enhance water quality. This research investigated the valorization of a vegetable residue (sawdust) as carbon source and biofilm carrier for denitrification in batch reactor to remove nitrate from synthetic groundwater. Throughout the study, the effects of some important parameters including initial nitrate concentration (50-130 mg/L), amount of carbon source (2-8 g/L) and initial pH (4-11) were studied. The results showed that the system achieved high denitrification; nitrate removal was greater than 99 % after 3 hours of incubation. The nitrite concentration (NO2 -) in the effluent was below 0.030 mg/L. The results also showed an important effect of C/N ratio on the performance of the process.

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