Publications Scientifiques

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Author: search.filters.author.Benbelkacem, Ouerdia

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    Heterotrophic denitrification of contaminated groundwater using arachis hypogaea. l shell as carbon source
    (ALJEST, 2020) Benbelkacem, Ouerdia; Benrachedi, K.; Boumechehour, F.; Alioua, C.
    In this research, agricultural waste, Arachis hypogaea.L shells (peanut shells) was investigated for use as carbon source and biofilm carrier to remove nitrate from groundwater in batch reactor laboratory. The feasibility of heterotrophic denitrification of a high nitrate concentration groundwater using a natural carbon source was studied, a series of batch tests was performed with synthetic groundwater to exanimate the effects of various environmental and operational factors such as temperature, pH, initial nitrate concentration and finally the mass of powder of Arachis hypogaea.L shells on the rate of heterotrophic denitrification. A range of physic chemical analysis was performed including: Infrared, granulometry, spectroscopy atomic absorption and Scanning Electron Microscope (SEM).Decreasing initial pH decreased denitrification; however, increasing pH had little effect on denitrification rates. Using Arachis hypogaea.L shells as organic substratum of varying size classes, we found that finer-graine showed higher rates of denitrification compared to large grains, likely due to increased surface area per volume of substratum.Our findings suggest that Arachis hypogaea.L shell play an important role in N removal because they gave a reduction percentage of 90%
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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.