Hodaifa, Gassan

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Universidad Pablo de Olavide
Biología Molecular e Ingeniería Bioquímica
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Ingeniería Química
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PhD programs
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Now showing 1 - 8 of 8
  • Publication
    High adsorption capacity of thermally treated solid olive wastes to treat olive mill wastewater: Treated solid olive wastes for depollution
    (Wiley, 2021-09) Bekri, Imene; Taleb, Zoubida; Taleb, Safia; Tlemsani, Salima; Hodaifa, Gassan; Abdelkader, Belfedal
    In this study, solid olive wastes were suggested as adsorbents for olive mill wastewater (OMWW) clean-up. These solid olive wastes underwent thermal treatment by two-step process: carbonization at 300°C and 400°C, then physical activation at 800°C and 1000°C. Characterizations were determined by FTIR, TGA/DTA, and N2 Adsorption-Desorption techniques. The efficiency of these new bio-adsorbents was verified on OMWW. Adsorption kinetics experiments were realized at room temperature and diluted OMWW (1/100 v/v). Evaluation of obtained activated carbons (ash, iodine value, and moisture) shows a good activity and stability in weight according to the thermogravimetric analysis. Moreover, the textural results of BET surface area showed a high area for activated carbons prepared from olive stones at 300°C/800°C (SBET = 208 ± 0.3 m2/g) and olive flesh at 400°C/1000°C (SBET = 77 ± 0.8 m2/g). The adsorption rates of OMWW were 91% after 120 min and 95.3% after 60 min contact time at pH = 2.0, respectively. At the end, the pH increased to neutral value. Thus, these bio-adsorbents from solid waste of olive industry can be efficient adsorbents for their liquid effluent clean-up.
  • Publication
    An overview of anaerobic membrane bioreactors: Current developments, fouling problems, and future prospects
    (Elsevier, 2023-12) Osman, Randa M.; Hodaifa, Gassan
    Anaerobic membrane bioreactors (AnMBRs) have become more popular in industrial wastewaters treatment since they are a less expensive alternative to aerobic procedures. AnMBRs are effective in chemical oxygen demand (COD) decreasing and favored the conversion of organic matter into a useful energy in form of biogas. AnMBRs generate effluent with less sediments and nutrients, and free of pathogens all these advantages in a small footprint. The biomass retention by the membrane increases the AnMBRs performance in case of substrates with high inhibitory or toxic concentration compounds. However, other problems persisted, such as membrane fouling and flux reduction at the membrane outlet, not forgetting ineffectiveness at lower temperatures as AnMBRs tend to operate best at high temperatures as the case of mesophilic or thermophilic growth. High dissolved and suspended particles, oil, fats, transmembrane pressure “TMP”, and flux have all been described as key contributors to membrane fouling, depending on the effluent strength. Lowering hydraulic retention time, removing nutrients, removing micro-pollutants, establishing a quantifiable mass and energy/economic balances, and including recovery of dissolved methane with high efficiency are all areas where more research is needed. The applications, limits, and future prospects of AnMBRs are summarized, and appraised in this brief review, with an emphasis on industrial wastewaters treatment. In addition, the AnMBRs are related to other wastewater treatment systems, which currently on used in the market.
  • Publication
    Advanced Oxidation Process: Applications and Prospects
    (MDPI, 2023-09) Hodaifa, Gassan; Zuorro, Antonio; Dominguez, Joaquín R.; García Rodríguez, Juan; Peres, José A.; Frontistis, Zacharias; Albqmi, Mha
  • Publication
    Evaluation of the olive mill wastewater treatment based on advanced oxidation processes (AOPs), flocculation, and filtration
    (Elsevier, 2023) Agabo-García, Cristina; Repetto, Guillermo; Albqmi, Mha; Hodaifa, Gassan
    Different eco-friendly processes are under study to treat olive mill wastewater in the line with European 2024 zero-waste plan. This study is focused on the application of advanced oxidation processes, flocculation, and filtration to determine the best operational condition to obtain high-quality regenerated water in a simple and fast process. In this sense, after photo-Fenton high organic matter removal percentages were obtained: turbidity = 78.3 ± 6.4 %, chemical oxygen demand = 82.9 ± 0.1 %, total organic carbon = 68.9 ± 8.2 %, total phenolic compound = 20.8 ± 9.1 %, and total nitrogen = 64.1 ± 2.1 %. However, the total iron was increased to 792 ± 71 mg/L generating toxicity in the wastewater (100 % mortality in D. magna toxicity test). The subsequent flocculation and filtration steps, refine the water quality. In this sense, different flocculants have been studied to optimize regenerated treated water and the operations time, determining the sedimentation rate in a typical Kynch curve. In quality terms, adjusting the oxidized water to pH = 6 showed the best option to determine lowest values of COD = 131 mg O2/L, TPCs = 0.110 mg/L, and total iron = 0.380 mg/L but with high values for sodium = 1320 mg/L and chloride ions = 473 mg/L. However, with a minimum amount of Nalco 9913 (10 mg/L) and Nalco GR-204 (50 mg/L) highest sedimentation rate was achieved. After three filtration steps, regenerated water for irrigation purposes with the following quality parameters pH = 7.0, electric conductivity = 6.04 mS/cm, turbidity = 0.66 FTU, COD = 451 mg O2/L, TOC = 142 mg/L, TPCs = 0.13 mg/L; sodium ions = 1.50 mg/L, chloride ions = 221 mg/L, total iron = 0.247 mg/L, and no toxicity was obtained.
  • Publication
    Nematode biomass production from sewage sludge as a novel method for circular economy
    (Elsevier, 2022) López Viso, Carlos; Hodaifa, Gassan; Muñoz Ruiz, Manuel Jesús
    Sludge generated in urban wastewater treatment plants is a huge environmental and economic challenge of sustainability. Sludge recovery is an environmental necessity and is a requirement for wastewater treatment plants. Predators have been proposed as a biological solution and simultaneously obtaining by-product of interest. Nematodes are predators that are found naturally in sludge but have never been proposed for sludge reduction. In this work, Caenorhabditis elegans, a nematode broadly used for biomedical studies, was used to grow on urban sludge, reaching a remarkable average population up to 92,668 nematodes/mL, 50.6% of sludge was converted into nematode biomass and up to 21.0% of organic matter removed. To demonstrate the viability of this nematode to grow and reduce urban sludges, different experiments in solid and liquid culture media were performed. The physio-chemical composition of the different types of sludges generated in the urban wastewater treatment plants was determined. The total lipids (4.52%, w/w) and fatty acid profiles obtained in the nematode biomass were determined. This work presents a new method to valorise urban sludge and opens the possibility to obtain by-products with high added value.
  • Publication
    Corn stover conversion into bioethanol and xylitol through an integral bioprocess: Kinetic study and modelling
    (Elsevier, 2022) Hodaifa, Gassan; Martínez Nieto, Leopoldo; Kowalska, Malgorzata
    Background: Corn stover residue is an important lignocellulosic material with a biochemical composition that arouses an interest in transforming into bioethanol and high added value product, such as e.g., xylitol. Methods: Hydrolysis experiments were carried out in a semi-pilot reactor of 12 L capacity. Fermentation experiments were conducted in a 1 L batch bioreactor capacity. Detailed kinetic study of the Candida guilliermondii NRC 5578 growth was carried out. Fermentation and the xylitol production process were modelled. Significant Findings: The used crude corn stover residue was composed of 11.1 % of lignin, 27.1 % of hemicellulose, 32.6 % cellulose, 24.5 % pentosanes, and 33.0 % of a-cellulose. Reconditioning liquid fractions of prehydrolysate and hydrolysate at 1.4 % (w/v) of H2SO4 were determined for the prehydrolysate 5.31 g/L, 9.07 g/L, 3.07 g/L, 11.2 g/L, 3.24 g/L, 3.89 and 2.56 g/L for pentoses, hexoses, arabinose, xylose, mannose, glucose, and fructose, respectively, and for hydrolysate 15.2 g/L of glucose. The higher values of maximum specific growth rate were registered for control experiments and compared to prehydrolysated and hydrolysated cultures. The highest ethanol formation rates of 2.29 g/(g L) and 0.117 g/(g L) in synthetic and hydrolysated cultures, respectively, were registered when 7 g/L glucose was used as carbon source
  • Publication
    Bioconversion study for xylitol and ethanol production by Debaryomyces hansenii: aeration, medium and substrate composition influence
    (Taylor and Francis, 2021-10-25) Mateo, Soledad; Hodaifa, Gassan; Sánchez, Sebastián; Moya, Alberto J.
    Debaryomyces hansenii has been employed to study, initially, the influence of the oxygen availabil ity on D-xylose to xylitol fermentation, as this parameter is considered as one of the most critical variables for this bio alcohol accumulation. Apart from the air supplied in the fermentation process through the stirring vortex (0.0 v/v/min), additional aeration rates (0.1–2.0 v/v/min) effects were discussed. Furthermore, a change in the fermentative medium composition as well as a compara tive analysis of D. hansenii behavior with respect to fermentation of D-glucose and D-xylose mix tures solutions, with the aim of producing both xylitol and ethanol bioproducts, were performed. For these purposes, specific growth rates, biomass productivities, specific substrate-uptake rates, overall biomass yields, specific xylitol formation rates and overall xylitol yields values have been calculated, applying a differential method to the kinetic data. Aeration influence was clearly evinced since a faster D-xylose metabolism, for aeration values close to 1.0 v/v/min, was noted. This yeast exhibited a sequential substrate consumption, firstly D-glucose and then D-xylose. The maximum xylitol yield (0.32 kg kg– 1) was obtained for 0.5 v/v/min airflow, remarking a significant reduction of this parameter for both above and below the quoted air supply value.
  • Publication
    Mixing degree effect in the photodegradation of olive mill wastewater
    (IEEE, 2022) Albqmi, Mha; Basegio-Castellani, Nathalia; Belaiba, Amani; Hodaifa, Gassan
    Currently, in olive oil producing countries, wastewater from olive mills is collected in large evaporation ponds without any treatment. This overall situation presents an environmental problem due to their high organic load and the presence of toxic and inhibiting growth compounds. Photo-Fenton reaction can be used to degrade the pollutant compounds that present in OMWs. The degree of mixing inside the photoreactor is a key parameter to increase the photodegradation of organic matter. For this reason, experiments were performed in a semi-industrial batch stirred photo-reactor (10 L capacity). The agitation rates were varied in each experiment as follows 60, 150, 300, 400, and 500 rpm. The experimental results showed that the photoreaction has developed in two steps, an instantaneous reaction that takes place in the first five moments and a second reaction that is slower and lasts up to three hours. During the instantaneous reaction, the conversion based on total organic carbon (TOC) increases with the augment of agitation rate, however, during the second step the maximum conversion (XTOC = 0.9) is recorded at 300 rpm in the first 100 min. The common operating conditions were initial pH = 3, hydrogen peroxide equal to that determined by the stoichiometry of the reaction, oxidant/catalyst ratio = 0.03, temperature = 20 °C and four artificial ultraviolet lamps to provide sufficient ultraviolet irradiation. The final treated water could be used in irrigation.