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Yassine Zegzouti,Aziz Boutafda,Loubna El Fels,Miloud El Hadek,Fatou Ndoye,Nalla Mbaye,Lamfeddal Kouisni,Mohamed Hafidi 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5
This study aims to use contaminated soil with leachate to select autochthonous fungi that are able to bioremediate three types of leachate, (Young (YL), Intermediate (IL) and Old (OL)). Eleven fungal species were isolated via the enrichment method using the leachate as the sole source of carbon and energy. The isolates were evaluated for their ability to grow and remove organic pollutants at 100%, 50% and 25% (v/v) of leachate in both solid and liquid cultures that were spiked with malt extract. The results indicated that only three fungi, Aspergillus flavus (A. flavus-LC106118), Aspergillus niger (A. niger-KT192262) and Fusarium solani (F. solani-KX349467) showed significantly high capacity to grow on leachate, with maximum radial growth rates (Gr) of 7.5 ㎜, 4.7 ㎜, and 5.3 ㎜, respectively. In addition, 34%, 22%, and 27%, respectively of COD removal rates were obtained at 25% concentration in YL. A. flavus was the most tolerant fungus against landfill leachate, followed by F. solani, and finally A. niger. Therefore, these three fungi are good candidates for leachate bioremediation. However, for a better remediation, the combined effects of different types of fungi and leachates on the fungal growth need to be considered during the fungi selection.
Assessment of occupational radiation exposure of NORM scales residues from oil and gas production
Fall EL Hadji Mamadou,Nechaf Abderrazak,Niang Modou,Rabia Nadia,Ndoye Fatou,Faye Ndeye Arame Boye 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
Radiological hazards from external exposure of naturally occurring radioactive materials (NORM) scales residues, generated during the extraction process of oil and gas production in southern Algeria, are evaluated. The activity concentrations of 226Ra, 232Th, and 40K were measured using high-purity gammaray spectrometry (GeHP). Mean activity concentration of 226Ra, 232Th and 40K, found in scale samples are 4082 ± 41, 1060 ± 38 and 568 ± 36 Bq kg1 , respectively. Radiological hazard parameters, such as radium equivalent (Raeq), external and internal hazard indices (Hex, Hin), and gamma index (Ig) are also evaluated. All hazard parameter values were greater than the permissible and recommended limits and the average annual effective dose value exceeded the dose constraint (0.3 mSv y1 ). However, for occasionally exposed workers, the dose rate of 0.65 ± 0.02 mSv y1 is lower than recommended limit of 1 mSv y1 for public.