Résumés
Abstract
The discharge of industrial wastewater and domestic sewage from Kara city affects the quality of Kara river water. To mitigate this water pollution, the capacity of mesoporous charcoal prepared from rice husk (RH) to remove the chemical oxygen demand (COD) in wastewater samples from five sites of Kara City was investigated. The temperature, pH, conductivity, total suspended solids (TSS), biochemical oxygen demand (BOD5), chemical oxygen demand (COD) and oxidizable matters (OM) of samples were analyzed. Batch experiments were applied to study the COD reduction by using powdered RH and two types of activated charcoals (AC). The experimental parameters used to identify optimal conditions for COD abatement are solution pH, contact time, mass of adsorbent and initial value of COD including the nature of wastewater. Activated charcoals showed a higher attenuation capacity of the COD in comparison with the rice husk powder. Maximal abatement rate (100%) of COD removal was obtained for the wastewater sample with a COD of 1 060 mg O2∙L-1 treated at pH 8 with the charcoal GAC-Base using an adsorbent concentration of 10 g∙L-1 with a contact time of 60 min.
Keywords:
- Chemical oxygen demand,
- wastewater,
- rice husk,
- activated charcoal,
- removal,
- chemical activation
Résumé
Les rejets d’eaux usées domestiques et industrielles de la ville de Kara affectent la qualité de l’eau de la rivière Kara. Notre travail porte sur l’évaluation de la capacité du charbon actif mésoporeux préparé par activation chimique à partir de la balle de riz à éliminer la demande chimique en oxygène (DCO) et contribuer ainsi à la réduction de la pollution de la rivière de Kara. Cinq échantillons d’eaux usées prélevés sur cinq sites de la ville de Kara ont été caractérisées par le pH, la température, la conductivité, les matières en suspension (MES), la DCO, la DBO5 et les matières oxydables (MO). Les tests de réduction de la DCO ont été réalisés par la méthode batch avec la poudre de balle de riz et deux types de charbons activés. Les effets du pH du milieu, du temps de contact, de la masse de l’adsorbant, de la valeur initiale de la DCO et la nature de l’eau usée sur la réduction de la DCO ont été évalués. Les charbons activés présentent une capacité d’atténuation de la DCO plus élevée en comparaison avec la poudre de balle de riz pour la réduction de la DCO des eaux usées. Le taux d’abattement maximal de la DCO est obtenu à 100 % pour une eau usée dont la DCO était de 1 060 mg O2∙L-1 traitée à pH 8 avec le charbon CAG-Base à la concentration en adsorbant de 10 g∙L-1 pendant 60 min de contact.
Mots-clés :
- Demande chimique en oxygène,
- eau usée,
- balle de riz,
- charbon activé,
- réduction,
- activation chimique
Parties annexes
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