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RISS 인기검색어
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- 저자 : Sami Sayadi (검색결과 5 건)
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Olfa Bechambi,Sami Sayadi,Wahiba Najjar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
C-doped ZnO with different molar ratio of carbon content were synthesized by hydrothermal method. The samples were characterized by X-ray diffraction, nitrogen physisorption, Raman spectroscopy,Fourier transformed infrared, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectra. The C-doped ZnO catalysts exhibited excellent photoactivity on bisphenol A degradation under UVirradiation in the presence of hydrogen peroxide. Under optimized conditions, C-doped ZnO reached100% BPA degradation and 70% BPA mineralization after 24 h of UV irradiation. The photocatalyticdegradation was found to follow the Langmuir–Hinshelwood kinetic model. Furthermore, the detaildegradation mechanism was investigated by the analysis of intermediates
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Combination of air stripping and biological processes for landfill leachate treatment
Yosr Smaoui,Jalel Bouzid,Sami Sayadi 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.1
Landfill waste decomposition generates a dark effluent named, leachate which is characterized by high organic matter content. To minimize these polluting effects, it becomes necessary to develop an effective landfill leachate treatment process. The objective of this study was to evaluate the performance of an innovative approach based on air stripping, anaerobic digestion (AD) and aerobic activated sludge treatment. A reduction of 80% of ammonia and an increase of carbon to nitrogen ratio to 25 were obtained, which is a suitable ratio for AD. This latter AD was performed in fixed bed reactor with progressive loading rate that reached 2 and 3.2 g COD/L/d for the raw and diluted leachate (1:2), respectively. The anaerobic treatment led to significant removal of chemical oxygen demand (COD) and biogas production, especially for the diluted leachate. The COD removal was of 78% for the raw leachate and a biogas production of 4 L/d with 70% methane content. The use of the diluted leachate led to 81% of COD removal and 7 L/d biogas with 75% methane content. It allowed a removal of 77% COD and more than 97% of the organic compounds present in the initial leachate sample.
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Rim Khlifi-Slama,Tahar Mechichi,Sami Sayadi,Abdelhafidh Dhouib 한국미생물학회 2012 The journal of microbiology Vol.50 No.2
The purpose of the present study was to determine the effect of natural mediators on the stability of the Trametes trogii crude laccase in the process of decolourization of textile effluents. Acetosyringone allowed the highest wastewaters decolourization rate of 25%. At higher concentrations of acetosyringone, the relative activity of laccase decreased approximately by between 38% and 88% after 5 days of incubation. T. trogii laccase was strongly inactivated at 3mM syringaldehyde, after 3 days of incubation. However,laccase activity is more stable in the presence of the vanillin and m-coumarate. The T. trogii growth on solid effluentbased-medium was examined and evaluated by measuring the colony diameter in cm. T. trogii was completely inhibited on 100:0 and 80:20 effluent:water solid medium, however,colony diameter reached 5 cm on 60:40 effluent:water solid medium after 13–14 days incubation. When the textile effluent was pre-treated with laccase and laccase-acetosyringone system, the colony diameter of 2 cm of T. trogii on 80:20effluent:water solid medium was reached after 14 and 10days of incubation respectively.
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A new approach for detoxification of landfill leachate using Trametes trogii
Yosr Smaoui,Mariem Fersi,Tahar Mechichi,Sami Sayadi,Jalel Bouzid 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.1
Landfill leachate constitutes one of the most polluting wastewaters. Their treatment was considered difficult due to the presence of high concentration of organic matter, ammonia, toxic organic compounds and heavy metals. Biological processes were found to be effective in several cases, but they are limited by the presence of inhibitory compounds in leachate. In this study we develop a biological process for the leachate biodetoxification using Trametes trogii (T. trogii; CLBE55). Results show that laccase activity, mycelia growth and chemical oxygen demand (COD) removal efficiencies varied depending on the leachate and ammonium concentration. Indeed T. trogii was able to grow in the presence of low concentration of landfill leachate of 10 and 30%. In fact, the biomass produced was 4.7 and 3.7 g/L, respectively leading to a COD removal of 66 and 53%, respectively. However, when the concentration of the introduced leachate exceeds 30%, the treatment efficiency and particularly the COD removal decreases to reach 15% at 100% leachate. The effect of the ammonia was also studied and results showed that the addition of 5 g/L of ammonia inhibited totally the production of laccase and the COD removal.
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Azza Touati,Tijani Hammedi,Wahiba Najjar,Zouhaier Ksibi,Sami Sayadi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
Ce–TiO2 catalysts synthesized through sol–gel method were explored for textile wastewaterphotocatalytic degradation in presence of H2O2. Synthesized materials were characterized by X-raydiffraction, Raman spectroscopy, UV–visible diffuse reflectance spectroscopy, N2 physisorption at 77 Kand H2-temperature programmed reduction. Suitable amount of cerium (1%) significantly inhibits theelectron–hole pairs recombination and reduces the energy gap values of the materials. 1% Ce–TiO2catalyst demonstrated superior catalytic performances permitting a 40% and 55% of TOC and colorconversions, respectively. The relationship between photocatalytic activity and physicochemicalproperties was discussed. Environmental impact of textile wastewater was evaluated by thebioluminescence test using the LUMIStox.
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