Polyvinyl acetate processing wastewater treatment using combined Fenton’s reagent and fungal consortium: Application of central composite design for conditions optimization

Ajmi, Khadija; Vismara, Elena; Manai, Imène; Haddad, Maroua; Hamdi, Moktar; Bouallagui, Hassib

doi:10.1016/j.jhazmat.2018.06.050

Cited by 28 publications

(12 citation statements)

References 49 publications

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“…The underlying principle of selecting CCD-based experiments is based on its practicality for determining the optimal operating conditions . The CCD framework provides us with sets of experiments that probe the HTC operation with respect to three key process parameters that can affect the structural and morphological properties of hydrochars, − namely (i) carbonization temperature80–250 °C, (ii) reaction time4–24 h, and (iii) microalgae/biomass weight ratio0:1 . The selected range for key process parameters was carefully chosen based on reports presented in previous literature. ,, Process optimization was carried out in design expert (version 10.0.4.0) and company Stat-Ease, Inc. 2016, generating 20 sets of test parameters that were experimentally executed and evaluated sequentially (Table S1, Supporting Information).…”

Section: Experimental Methodsmentioning

confidence: 99%

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO₂ Capture

Balou

Babak

Priye

2020

ACS Appl. Mater. Interfaces

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We report a unique naturally derived activated carbon with optimally incorporated nitrogen functional groups and ultra-microporous structure to enable high CO 2 adsorption capacity. The coprocessing of biomass (Citrus aurantium waste leaves) and microalgae (Spirulina) as the N-doping agent was investigated by probing the parameter space (biomass/microalgae weight ratio, reaction temperature, and reaction time) of hydrothermal carbonization and activation process (via the ZnCl 2 /CO 2 activation) to generate hydrochars and activated carbons, respectively, with tunable nitrogen content and pore sizes. The central composite-based design of the experiment was applied to optimize the parameters of the prehydrothermal carbonization procedure resulting in the fabrication of N-enriched carbonaceous products with the highest possible mass yield and nitrogen content. The resulting hydrochars and activated carbon samples were characterized using elemental analysis, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and Brunauer−Emmett−Teller surface area analysis. We observe that while N-doping and the activation process can individually enhance the CO 2 adsorption capacity to some extent, it is the combined effect of the two processes that synergistically work to greatly increase the adsorption capacity of the N-doped activated carbon by an amount which is more than the sum of individual contributions. We analyze the origins of this synergy with both physical and chemical characterization techniques. The resulting naturally derived activated carbon demonstrates one of the highest CO 2 adsorption capacities (8.43 mmol/g) with rapid adsorption kinetics and good selectivity and reusability.

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Section: Experimental Methodsmentioning

confidence: 99%

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO₂ Capture

Balou

Babak

Priye

2020

ACS Appl. Mater. Interfaces

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“…From 1 H‐NMR results it can be seen that there was no obvious difference peak found. That is, after oxidation chain scission of sodium hypochlorite, the product is indeed PVA 32 . The three peaks at 4.3 to 4.8 ppm from left to right correspond to the isotactic, syndiotactic, and random structures of the hydroxyl group [OH] of polyvinyl alcohol 33 .…”

Section: Resultsmentioning

confidence: 99%

Ultra‐low degree of polymerization polyvinyl alcohol products prepared by oxidative chain scission: Method and mechanism

Song

Deng

Zhang

2021

J of Applied Polymer Sci

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In this paper, the high value‐added (ultra‐low degree of polymerization [ULDP]) polyvinyl alcohol (PVA) product was successfully prepared by oxidative chain scission method with sodium hypochlorite as an oxidant. When the molar ratio of PVA to NaClO is not less than 1:1.8, the reaction is stirred for several hours (≥2 h) at a temperature not exceeding 50°C. After precipitation and washing in methanol, PVA with polymerization degree of 38–150 can be obtained after drying. The infrared spectrum (IR) and nuclear magnetic hydrogen spectrum (1H‐NMR) test proved that the product obtained by this method is indeed PVA. The results of 1H‐NMR also showed that the chain broken has no selectivity and the stereoregularity of hydroxyl group did not change significantly. Through radical quenching experiment and electron paramagnetic resonance (EPR) analysis, it is proved that OCl− is the main active oxide, ·Cl makes the oxidative chain scission process can be realized quickly, and ·OH is an indispensable factor for obtaining ULDP PVA. Under the combined action of these three, high value‐added PVA with ULDP was successfully prepared. Additionally, the sodium hypochlorite oxidized the ·OH captured by 5,5‐dimethyl‐1‐pyrroline‐n‐oxide (DMPO‐OH) to 2‐hydroxy‐5,s‐dimethyl‐1‐pyrroline‐N‐oxide (HDMPO‐OH) in an alkaline environment.

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“…Dilution reduces the amount of pollutants present in the effluent and improves the growth and metabolism of fungal species; moreover, it increases the COD removal and decolorization efficiency of the effluent (Deepika and Dastidar, 2016;Strong, 2010). Therefore, COD removal and decolorization dilution was the most effective parameter (Ajmi et al, 2018). The results showed that by enhancing the dilution rate from 90% to 25%, the removal efficiency of COD removal and decolorization also enhanced, which could be owing to the lower contaminant concentration at dilution of 25%; therefore, the fungi had a higher potential to remove effluent pollutants (Figures 4 and 5).…”

Section: Effect Of Dilution On Chemical Oxygen Demand Removal and Decolorization Efficiency By Mixed Fungal Culturementioning

confidence: 99%

“…The results of this research confirm the ability of predominant native fungi for COD removal and decolorization from cardboard recycling industrial effluent. As decolorization and COD removal of the effluent are natural, bioremediation of the wastewater by mixed fungal culture may be owing to the use of these pollutants as a carbon source and the energy source for enzyme growth and production (Ajmi et al, 2018;Tyagi et al, 2014).…”

Section: Effect Of Dilution On Chemical Oxygen Demand Removal and Decolorization Efficiency By Mixed Fungal Culturementioning

confidence: 99%

Bioremediation of cardboard recycling industry effluents using mixed fungal culture

Hosseini

Ghaneian

Ghafourzade

et al. 2021

PRT

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Purpose This paper aims to evaluate the bioremediation [chemical oxygen demand (COD) and color removal] of the effluent from the cardboard recycling industry in Yazd, central province of Iran, using mixed fungal culture. Design/methodology/approach First, the effluent samples from the cardboard recycling industry were cultured on potato dextrose agar medium to isolate native fungal colonies. The grown colonies were then identified using morphological macroscopic and microscopic characteristics to choose the dominant fungi for bioremediations. The mixed cultures of Aspergillus niger, Aspergillus flavus and Penicillium digitatum were finally used for bioremediation experiments of the cardboard recycling industry. A suspension containing 1 × 106 CFU/ml of fungal spores was prepared from each fungus, separately and their homogenous mixture. Sewage samples were prepared and sterilized and used at 25%, 50% and 90% dilutions and pH levels of 5, 7 and 8 for bioremediation tests using mixed fungal spores. Following that, 10 ml of the mixed fungal spores were inoculated into the samples for decolorization and COD removal and incubated for 10 days at 30°C. The amount of COD removal and decolorization were measured before incubation and after 3, 6 and 10 days of inoculation. In this research, the color was measured by American Dye Manufacturer Institute and COD by the closed reflux method. The results of the present study were analyzed using SPSS 21 statistical software and one-way ANOVA tests at p-value < 0.05. Findings The results of this research showed that the mean decolorization by mixed fungal culture over 10 days at pH levels of 5, 7 and 8 were 44.40%, 45.00% and 36.84%, respectively, and the mean COD removal efficiency was 71.59%, 73.54% and 16.55%, respectively. Moreover, the mean decolorization at dilutions of 25%, 50% and 90% were 45.00%, 31.93% and 30.53%, respectively, and the mean COD removal efficiency was 73.54%, 62.38% and 34.93%, respectively. Therefore, the maximal COD removal and decolorization efficiency was obtained at dilution of 25% and pH 7. Originality/value Given that limited studies have been conducted on bioremediation of the effluent from the cardboard recycling industry using fungal species, this research could provide useful information on the physicochemical properties of the effluent in this industry.

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Polyvinyl acetate processing wastewater treatment using combined Fenton’s reagent and fungal consortium: Application of central composite design for conditions optimization

Cited by 28 publications

References 49 publications

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO₂ Capture

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO₂ Capture

Ultra‐low degree of polymerization polyvinyl alcohol products prepared by oxidative chain scission: Method and mechanism

Bioremediation of cardboard recycling industry effluents using mixed fungal culture

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Polyvinyl acetate processing wastewater treatment using combined Fenton’s reagent and fungal consortium: Application of central composite design for conditions optimization

Cited by 28 publications

References 49 publications

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO2 Capture

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO2 Capture

Ultra‐low degree of polymerization polyvinyl alcohol products prepared by oxidative chain scission: Method and mechanism

Bioremediation of cardboard recycling industry effluents using mixed fungal culture

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Product

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Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO₂ Capture

Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO₂ Capture