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Investigation on removal pathways of Di 2-ethyl hexyl phthalate from synthetic municipal wastewater using a submerged membrane bioreactor

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Journal of Environmental Sciences 2015年第11期27卷 37-50页

作者： Mehdi Zolfaghari patrick drogui Brahima Seyhi Satinder Kaur Brar Gerardo Buelna Rino Dubé Nouha Klai National Institute of Scientific Research Water Earth and Environment (INRS-ETE) University of Quebec Industrial Research Center of Quebec

Highly hydrophobic Di 2-ethyl hexyl phthalate（DEHP） is one of the most prevalent plasticizers in wastewaters. Since its half-life in biological treatment is around 25 days, it can be used as an efficiency indicator of wastewater treatment plant for the removal of hydrophobic emerging contaminants. In this study, the performance of submerged membrane bioreactor was monitored to understand the effect of DEHP on the growth of aerobic microorganisms. The data showed that the chemical oxygen demand（COD）and ammonia concentration were detected below 10 and 1.0 mg/L, respectively for operating conditions of hydraulic retention time（HRT） = 4 and 6 hr, sludge retention time（SRT） = 140 day and sludge concentration between 11.5 and 15.8 g volatile solid（VS）/L. The removal efficiency of DEHP under these conditions was higher and ranged between 91% and 98%. Results also showed that the removal efficiency of DEHP in biological treatment depended on the concentration of sludge, as adsorption is the main mechanism of its removal. For the submerged membrane bioreactor, the pore size is the pivotal factor for DEHP removal, since it determines the amount of soluble microbial products coming out of the process. Highly assimilated microorganisms increase the biodegradation rate, as 74% of inlet DEHP was biodegraded; however, the concentration of DEHP inside sludge was beyond the discharge limit. Understanding the fate of DEHP in membrane bioreactor,which is one of the most promising and futuristic treatment process could provide replacement for conventional processes to satisfy the future stricter regulations on emerging contaminants.

关键词： Di 2-ethyl hexyl phthalate Submerged membrane bioreactor Removal efficiency Soluble microbial products Toxicity

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Optimization of Preparation Conditions of Activated Carbons Based on the Shells of Ricinodendron heudoltii

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Journal of Materials Science and Chemical Engineering 2022年第10期10卷 40-58页

作者： Kouakou Yao Urbain Karidioula Daouda Zran Vanh Eric-Simon Trokourey Albert Yao Kouassi Benjamin drogui patrick UFR Sciences et Technologies Université de Man Man C&#244 te d’Ivoire Laboratoire de Constitution et Réaction de la Matière (LCRM) à l’UFR SSMT Université Félix Houphou&#235 t-Boigny (UFHB) de Cocody Abidjan C&#244 te d’Ivoire Laboratoire des Procédés Industriels de Synthèse de l’Environnement et des Energies Nouvelles (LAPISEN) de l’Institut National Polytechnique Félix Houphouë t Boigny de Yamoussoukro Yamoussoukro C&#244 te d’Ivoire Institut National de la Recherche Scientifique Département INRS-Eau Terre et Environnement Université du Québec Québec Canada

The purpose of this work is to prepare better activated carbons from the shells of Ricinodendron Heudelotii by chemical activation with sulfuric acid (H2SO4) and sodium hydroxide (NaOH). The process was optimized by a full factorial design (2K) based on the analysis of the external specific surface area of sixteen (16) activated carbons prepared according to the parameters of the preparation. This active analysis reveals that under the preparation conditions, good carbons are obtained for a sodium hydroxide concentration equal to 1 M, an impregnation time of 24 h and carbonization at 500˚C for 1 h. The external specific surface of this carbon is 358 m2 • g-1. The characteristics of this prepared carbon are as follows: a pH at zero point charge (pHpzc) of 8.2, a predominantly amorphous structure, a basic character and a low ash content (4.2%). It also has surface functions;the lactonic and carbonyl groups (C=O) at 1600 cm-1 and the carboxylate groups (O-H or C-O) at 1340 cm-1.

关键词： Activated Carbons Ricinodendron Heudelotii Chemical Activation Optimization Specific Surface

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Physic, Chemical and Mineralogical Characterizations of Clays Used in the Making of Traditional Ceramics in the City of Katiola, C ôte d’Ivoire

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Journal of Minerals and Materials Characterization and Engineering 2023年第4期11卷 81-91页

作者： Isabelle Linda He Grah patrick Atheba N’guadi Blaise Allou patrick drogui My Ali El Khakani Gildas Komenan Gbassi Laboratory of Analytical Sciences and Public Health Training and Research Unit of Pharmaceutical Sciences and Biological University Félix Houphou&#235t Boigny Abidjan C &#244te d’Ivoire Laboraratory of Constitution and Reaction of Matter Unit for Training and Research in the Sciences of the Structures of Matter and Technology University Félix Houphou&#235t Boigny Abidjan C &#244te d’Ivoire Center Water Earth Environment National Institute for Scientific Research Quebec Canada Center Energy Materials and Telecommunications National Institute for Scientific Research Varennes Canada

In C ?te d’Ivoire, traditional ceramics are widely used in the form of pottery. The latter is used to store food, water and cereals. Analyzes (X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductive plasma optical emission spectrometry (ICP-OES), scanning electron microscopy (SEM) and analysis thermal gravimetric (ATG)) were carried out to determine the morphology, the chemical, physical and pedological constituents of these raw materials. It appears from this study that the clays used in the Mangoro pottery of Katiola contain silica SiO2, alumina Al2O3 and iron oxide Fe2O3 as well as kaolinite, muscovite, smectite and quartz.

关键词： Ceramics Characterization Clays Kaolinite Muscovite Smectite Quartz

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Physico-Chemical and Mineralogical Characterizations of Two Togolese Clays for Geopolymer Synthesis

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Journal of Minerals and Materials Characterization and Engineering 2022年第5期10卷 400-409页

作者： Komla Mawoulikplim Anove Sanonka Tchegueni Koffi Agbegnigan Degbe Koffi Fiaty Moursalou Koriko patrick drogui Gado Tchangbedji Laboratoire Gestion Traitement et Valorisation des Déchets (GTVD) Faculté des Sciences Université de Lomé Lomé Togo Laboratoire d’Automatique de Génie des Procédés et de Génie Pharmaceutique (LAGEPP) Batiment CPE Université Claude Bernard Lyon 1 Lyon France Centre Eau Terre Environnement de l’Institut National de la Recherche Scientifique (INRS)-É TÉ Québec Canada

Geopolymers are an alternative to Portland cement, well known for their contribution to greenhouse gas emissions. Finding materials that can validly replace Portland cement is a challenge. It is in this logic that this work was undertaken with the objective of characterizing two local clay resources of Togo as raw materials for geopolymers. The physico-chemical properties of these clays were determined by characterization using X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetric (TGA) and elemental analysis (ICP-OES). The results show that these clays contain kaolinite and therefore can be used in the formulation of geopolymers. The characterized clays underwent heat treatments transforming the crystalline phases into more reactive amorphous phases and then were activated by an alkaline solution in order to formulate the geopolymer materials. These elaborated materials were analyzed by Fourier transform infrared to identify the types of bonds formed. The results of these analyses show that these two local clays are well suited to be used in synthesizing geopolymers. Our future work will focus on the constraints of consolidation as well as the mechanical properties of these geopolymer materials.

关键词： Clay Kaolinite Physico-Chemical Characterization Geopolymer

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Biodiesel production from microbial lipid obtained by intermittent feeding of municipal sludge and treated crude glycerol

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Systems Microbiology and Biomanufacturing 2021年第3期1卷 344-355页

作者： Lalit R.Kumar Sravan K.Yellapu R.D.Tyagi patrick drogui INRS-ETE Universite du QuebecQuebec G1K 9A9Canada School of Technology Huzhou UniversityHuzhouChina BOSK BIOPRODUCTS 100-399 rue JacquardQuebec G1N 4J6Canada

In the present study,municipal secondary sludge and purified glycerol(obtained after acid treatment of crude glycerol)were used together for lipid production using intermittent feeding *** sludge feeding strategy(sludge SS 30 g/L)resulted in a higher biomass(54.99 g/L)and lipid concentration(25.35 g/L)at 96 h when compared to 35 g/L SS single sludge feeding or control strategy(45.67 g/L biomass&19.16 g/L lipid).Moreover,the intermittent sludge feeding strategy significantly reduced foaming and requirement of anti-foam during fermentation when compared to control *** energy balance of biodiesel production from lipid obtained by intermittent sludge feeding strategy(30 g/L SS)was energeti-cally *** was also revealed from yield coefficients and energy balance that sludge had an important contribution in microbial lipid and biodiesel production.

关键词： Intermittent feeding Municipal Sludge Purified glycerol Microbial lipid Biodiesel

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Optimization of trace elements in purified glycerol for microbial lipid and citric acid production by Yarrowia lipolytica SKY7

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Systems Microbiology and Biomanufacturing 2021年第1期1卷 76-89页

作者： Lalit R.Kumar Sravan K.Yellapu R.D.Tyagi patrick drogui INRS-ETE 490Rue de la CouronneQuebecQC G1K 9A9Canada

Purified glycerol obtained after acid treatment of crude glycerol solution was used as the carbon source for lipid and citric acid production using *** *** purified glycerol was high in phosphorus,it was important to inves-tigate the impact of fortification of trace elements in the medium on cell growth,lipid and citric acid(CA)*** all the trace elements(including phosphates and sulfates)required for growth and lipid production were added to the purified glycerol medium,high biomass(51.67 g/L)and lipid concentration(19.47 g/L)were observed at 96 h of fed-batch fermentation with low CA concentration of 5.42 g/*** purified glycerol medium without additional trace elements gave low biomass(27.67 g/L),lipid concentration(9.35 g/L)at 80 h of fed-batch fermentation,but gave high CA concentration(24.51 g/L).When purified glycerol was provided with only sulfates or all elements except KH_(2)PO_(4),low biomass(32.59 g/L and 38.52 g/L)and citric acid concentration(1 g/L and 2.42 g/L)were obtained at 96 h.

关键词： Yarrowia lipolytica SKY7 Purified glycerol Trace elements Microbial lipid Citric acid

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Adsorption Kinetics and Thermodynamics Study of Butylparaben on Activated Carbon Coconut Based

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Journal of Encapsulation and Adsorption Sciences 2018年第2期8卷 39-57页

作者： patrick Atheba N’Guadi Blaise Allou patrick drogui Albert Trokourey Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada Laboratoire de Chimie Physique Université Félix Houphou&#235 t Boigny de Cocody-Abidjan Abidjan C&#244 te d’Ivoire Advanced Materials Group Materials Science and Technology Division CSIR-NEIST Jorhat India

In this work, low cost coconut biochar based activated carbon (CBAC) was used for adsorption of Butylparaben (BPB) from aqueous medium. The prepared CBAC was characterized using BET, Boehm analysis and the adsorption equilibrium, kinetics and thermodynamics studies of BPB adsorption were carried out. During batch adsorption runs, the effects of factors, such as contact time (0 - 300 min), CBAC dose (200 - 800 mg), pH (3 - 11) and solution temperatures (303 - 348 K) were investigated on BPB removal. Experimental results reveal that the BPB removal efficiency on CBAC is higher than 97% under acidic and neutral conditions. Equilibrium data were fitted by Langmuir, Freundlich and Temkin isotherm models with correlation coefficient more than 0.9. The pseudo-second order kinetic model was observed to fit well the adsorption data. Thermodynamic analysis shows positive values of standard Gibb’s free energy, suggesting the non-spontaneity of the process. The changes in enthalpy (0.2 ***-1) and entropy (19 ***-1) were found to be endothermic with an increase of randomness. The high adsorption efficiency of the synthesized coconut biochar materials with low cost indicates that it may be a promising adsorbent for removing organic compounds.

关键词： Coconut Shell Activated Carbon Adsorption Butylparaben Kinetics Isotherm

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Preparation and Characterization of Activated Carbon Based on Wood (Acacia auriculeaformis, Côte d’Ivoire)

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Journal of Encapsulation and Adsorption Sciences 2019年第2期9卷 63-82页

作者： Drissa Ouattara Kra N’guadi Blaise Allou patrick Atheba patrick drogui Albert Trokourey Laboratoire de Chimie Physique Université Félix Houphou&euml t Boigny de Cocody-Abidjan Abidjan C&ocirc te d’Ivoire Institut National de la Recherche Scientifique (INRS-ETE) Université du Québec Quebec City Canada

The objective of this work is to prepare one of the best activated carbon (CA) based on wood (Acacia auriculeaformis). The chemical activation method was used for varying the chemical agent namely phosphoric acid H3PO4 (CAA), sodium hydroxide NaOH (CAB), and sodium chloride NaCl (CAS). The physico-chemical analysis of the three activated carbons indicated that, under the conditions of preparation, the activated carbons possess activation efficiencies lower than 50% (41.81% for CAA, 26.25% for CAB and 48.87% for CAS), low ash content (CAA: 5.00%, CAB: 14.90 and CAS: 6.60%) and iodine values ranging from 190.35 mg/g to 380.71 mg/g, suggesting that the good quality of the prepared activated carbon. The surface functional groups using Boehm test and the zero point charge (pHZPC) methods confirmed the acidic, basic and neutral character for CAA, CAB and CAS respectively (CAA: pHZPC = 4.8, CAB: pHZPC = 8.2, CAS: pHZPC = 6.8). The surface specific areas were determined through the liquid phase adsorption of acetic acid and methylene blue using the Langmuir method and BET analysis. Also, the porosity was determined. The BET surface areas of CAA, CAB and CAS were respectively 561.60 m2/g, 265.00 m2/g and 395.40 m2/g. The influence of chemical activation agent on pores formation was confirmed by scanning electron microscopic (SEM) analysis. CAA was selected as the best activated carbon because of its good surface area and good pore volume compared to those found in the literature. Therefore, its application as an adsorbent for effluents treatment could be explored. In addition, the best activating agent for coal from Acacia auriculeaformis was found to be phosphoric acid.

关键词： Activated Carbon Acacia auriculeaformis Chemical Activation Phosphoric Acid Sodium Hydroxide Sodium Chloride

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ORIGINAL ARTICLE Dynamics of bacterial community at varying sludge retention time within membrane bioreactor treating synthetic hospital wastewater

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Systems Microbiology and Biomanufacturing 2021年第4期1卷 471-482页

作者： Bhagyashree Tiwari Balasubramanian Sellamuthu Sarah Piche-Choquette patrick drogui Rajeshwar Dayal Tyagi Marc Antoine Vaudreuil Sebastien Sauve Gerardo Buelna Rino Dube INRS-Eau Terre et EnvironnementQuebecQC G1K9A9Canada Departement de Radiologie Radio-Oncologie et Medecine NucleaireCentre Hospitalier de l’Universite de MontrealMontrealQC H2X 0A9Canada INRS-Institut Armand-Frappier LavalQC H7V 1B7Canada BOSK Bio ProductsQuebecCanada School of Technology Huzhou UniversityHuzhouChina Department of Chemistry Universite de MontrealMontrealQCCanada Centre de Recherche Indust

The study was conducted to investigate the effect of sludge retention on bacterial community composition of membrane bioreactor(MBR)treating synthetic hospital *** removal of four pharmaceuticals,namely carbamazepine,estradiol,venlafaxine,and ibuprofen in MBR,was studied at varying sludge retention time(SRT)duration of 100,45,and 15 days and hydraulic retention time(HRT)of 18 *** removal of ibuprofen and estradiol was constant at varying SRT;however,a negligible removal of carbamazepine and low removal of venlafaxine was observed(<20%).The study suggested that the SRT of 45 days in MBR could provide maximum treatment efficiency via decreasing membrane *** effect of sludge age and pharmaceutical presence on the bacterial community was investigated via high-throughput *** study reveals that the variation in SRT affects the dynamics of the bacterial community *** instance,the dominant bacterium Caldimonas of SRT 100 was disappeared at lower ***,the profile of the dominant genus of the SRTs varied greatly from each other.

关键词： Membrane bioreactor Pharmaceuticals Sludge retention time Bacterial community

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Photocatalytic Degradation of Paraquat Herbicide Using a Fixed Bed Reactor Containing TiO2Nanoparticles Coated onto β-SiCAlveolar Foams

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American Journal of Analytical Chemistry 2019年第5期10卷 171-184页

作者： Ignace Christian M’Bra Grah patrick Atheba Didier Robert patrick drogui Albert Trokourey Institut de Chimie et Procédés pour l’Energie l’Environnement et la Santé (ICPEES) CNRS-UMR7515 Université de Stras-bourg antenne de Saint-Avold Université de Lorraine Saint-Avold France Laboratoire de Chimie Physique UFR Sciences des Structures de la Matière et de la Technologie (SSMT) Université Félix Houphou&#235 t Boigny d’Abidjan C&#244 te d’Ivoire Institut National de la Recherche Scientifique (INRS-Eau Terre et environnement) Université du Québec Québec Canada

Photocatalytic degradation of paraquat (PQ) aqueous solutions was studied in a fixed bed photoreactor under UV irradiation at 368 nm. This contained β-SiC alveolar foams coated with TiO2 P25 by dip-coating method. SEM analyses revealed that the surface of the film did not exhibit cracks in the presence of TTIP as a binder in the TiO2 P25 suspension. The following parameters were studied in continuous mode operation: the flow rate in the reactor, the initial concentration of the paraquat, the pH of the solution, the weight of photocatalytic material with the number of foams in the reactor and the weight of the catalyst deposited onto the support. The results showed that by working under optimal operating conditions at natural pH (pH = 6.7), low paraquat (Co = 10 ppm), and flow (26 mL/min), we recorded approximately (43.16 ± 1.00)% oxidation of paraquat and a decrease in total organic carbon (TOC) of (27.13 ± 1.00)% after about 70 minutes. The apparent rate constant is in the order of (0.0656 ± 0.0010) min-1. In addition, by increasing the amount of β-SiC foams coated with TiO2, we improve the degradation of paraquat in the same order. The study of aging of the material showed its stability over time. However, photocatalytic activity was limited after 20 minutes of UV irradiation due to the limitation of the diffusion of the paraquat molecules towards the surface of the photocatalyst. As an outcome, we obtained an efficient TiO2/β-SiC material for photocatalytic degradation of organic compounds in water.

关键词： Photocatalytic Degradation Paraquat β-SiC Foam TiO2 P25 Water

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