Bioremediation of hexavalent chromium by an indigenous bacterium Bacillus cereus S10C1: optimization study using two level full factorial experimental design

Nacer, Amina; Boudjema, Souheyla; Bouhaous, Mahmoud; Boudouaia, Nacer; Bengharez, Zohra

doi:10.5802/crchim.81

Cited by 4 publications

(2 citation statements)

References 60 publications

(71 reference statements)

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“…The values in Table 5 demonstrate a strong correlation between the experimental results and the model predictions. The nearly identical R 2 and adjusted R 2 values indicate that the model does not contain negligible variables ( Nacer et al, 2021 ), elucidating the significance of the studied factors (temperature, agitation speed, fermentation duration, and sample concentration). In other words, adding significant independent variables to the model will increase the adjusted R 2 value, while adding non-significant ones will reduce the adjusted R 2 value.…”

Section: Resultsmentioning

confidence: 86%

Aspergillus niger as an efficient biological agent for separator sludge remediation: two-level factorial design for optimal fermentation

Thegarathah,

Jewaratnam,

Simarani

et al. 2024

PeerJ

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Background The booming palm oil industry is in line with the growing population worldwide and surge in demand. This leads to a massive generation of palm oil mill effluent (POME). POME is composed of sterilizer condensate (SC), separator sludge (SS), and hydro-cyclone wastewater (HCW). Comparatively, SS exhibits the highest organic content, resulting in various environmental impacts. However, past studies mainly focused on treating the final effluent. Therefore, this pioneering research investigated the optimization of pollutant removal in SS via different aspects of bioremediation, including experimental conditions, treatment efficiencies, mechanisms, and degradation pathways. Methods A two-level factorial design was employed to optimize the removal of chemical oxygen demand (COD) and turbidity using Aspergillus niger. Bioremediation of SS was performed through submerged fermentation (SmF) under several independent variables, including temperature (20–40 °C), agitation speed (100–200 RPM), fermentation duration (72–240 h), and initial sample concentration (20–100%). The characteristics of the treated SS were then compared to that of raw sludge. Results Optimal COD and turbidity removal were achieved at 37 °C 100 RPM, 156 h, and 100% sludge. The analysis of variance (ANOVA) revealed a significant effect of selective individual and interacting variables (p < 0.05). The highest COD and turbidity removal were 97.43% and 95.11%, respectively, with less than 5% error from the predicted values. Remarkably, the selected optimized conditions also reduced other polluting attributes, namely, biological oxygen demand (BOD), oil and grease (OG), color, and carbon content. In short, this study demonstrated the effectiveness of A. niger in treating SS through the application of a two-level factorial design.

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Section: Resultsmentioning

confidence: 86%

Aspergillus niger as an efficient biological agent for separator sludge remediation: two-level factorial design for optimal fermentation

Thegarathah,

Jewaratnam,

Simarani

et al. 2024

PeerJ

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“…Dyes’ removal from effluents has been carried out by various physicochemical technologies including coagulation and flocculation, electrocoagulation, filtration, ion exchange and advanced oxidation processes (Ismail and Sakai, 2022; Lan et al, 2022; Moradihamedani, 2022; Shelke et al, 2022), as well as biological techniques involving aerobic, anaerobic degradation and bioremediation by bacteria, fungi and algae (Nacer et al, 2021; Nachiyar et al, 2023). Adsorption is considered as one of the most widely tested separation processes for various pollutants (Akrout et al, 2015; Azzaz et al, 2017; Boudouaia et al, 2019; Kaikiti et al, 2021; Stylianou et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of double-cross-linked alginate-based hydrogel: Characterization and use in a context of circular economy for cationic dye removal

et al. 2023

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Hydrogels based on natural polysaccharides have received special attention in the last decade due to their interesting features, such as availability, biocompatibility, biodegradability and safety. Such characteristics may make them sustainable and eco-friendly materials for water and wastewater treatment, meeting the concept of circular economy. In this study, a novel double-cross-linked alginate-based hydrogel has been successfully synthesized using epichlorhydrin and sodium trimetaphosphate (STMP) as cross-linker agents and then used for the removal of methylene blue (MB) dye under different operating conditions. The obtained hydrogel was deeply characterized by using various analytical techniques, namely Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Experimental results showed that the synthesized double cross-linked hydrogel with relatively high STMP concentration (0.26 M) has promising structural and textural properties. This material exhibited excellent removal ability towards MB with a maximum adsorption capacity of about 992 mg/g for an initial pH of 10. The kinetic and isotherm modeling study revealed that the pseudo-second-order and Freundlich models fitted well the measured adsorption experimental data. The MB adsorption process onto the synthesized hydrogel is exothermic, feasible and spontaneous. It mainly includes electrostatic interaction and hydrogen bonds. These findings suggest that double-cross-linked alginate-based hydrogel can be considered as an attractive and potential adsorbent for an effective cationic dye removal from aqueous environments. The use of such a green adsorbent for the treatment of organic-pollutants-rich industrial wastewaters promotes sustainability and circular economy concepts.

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Mathematical modeling and optimization by the application of full factorial design and response surface methodology approach for decolourization of dyes by a newly isolated Photobacterium ganghwense

Altayb

Kouidhi

Baothman

et al. 2021

Journal of Water Process Engineering

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Bioremediation of hexavalent chromium by an indigenous bacterium Bacillus cereus S10C1: optimization study using two level full factorial experimental design

Abstract: Bioremediation of hexavalent chromium by an indigenous bacteriumBacillus cereus S10C1: optimization study using two level full factorial experimental design

Cited by 4 publications

References 60 publications

Aspergillus niger as an efficient biological agent for separator sludge remediation: two-level factorial design for optimal fermentation

Aspergillus niger as an efficient biological agent for separator sludge remediation: two-level factorial design for optimal fermentation

Facile synthesis of double-cross-linked alginate-based hydrogel: Characterization and use in a context of circular economy for cationic dye removal

Mathematical modeling and optimization by the application of full factorial design and response surface methodology approach for decolourization of dyes by a newly isolated Photobacterium ganghwense

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