Bio-sorption of toxic metals from industrial wastewater by algae strains Spirulina platensis and Chlorella vulgaris: Application of isotherm, kinetic models and process optimization
<p dir="ltr">The present study evaluates the effect of an acidic treatment on the improvement of the percentage removal of toxic metal (%TM<sub>rem</sub>) from wastewater by algae strains (<i>Spirulina platensis</i> (<i>SP</i>) and <i>Chlorel...
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| منشور في: |
2021
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إضافة وسم
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| الملخص: | <p dir="ltr">The present study evaluates the effect of an acidic treatment on the improvement of the percentage removal of toxic metal (%TM<sub>rem</sub>) from wastewater by algae strains (<i>Spirulina platensis</i> (<i>SP</i>) and <i>Chlorella</i><i> </i><i>vulgar</i> (<i>CV</i>)) under different adsorbent dosages (0.2–2.5 g), a pH of (4–8) and contact time (5–100 min). The acidic treatment (Ac-T) altered the functional groups on the surface of algae promoting more electronegative groups and improved the %TM<sub>rem</sub> of Al, Ni and Cu. Treated <i>SP</i> removed up to 95.0 ± 0.3% (Std. Dev = 0.24), 87.0 ± 0.2% (Std. Dev = 0.34)%, and 63.0 ± 0.3% (Std. Dev = 0.14) of Al, Ni, and Cu at the optimum pH of 5.5, 6.0, and, 7.0 and an adsorbent dosage of = 2.5 ± 0.1 g/L (Std. Dev = 0.14) g/L, respectively. Lower %TM<sub>rem</sub> of 87.0% ± 0.2 (Std. Dev = 0.09), 79.1 ± 0.4% (Std. Dev = 0.08), and 80.0 ± 0.2% (Std. Dev = 0.04) were achieved with treated <i>CV</i>, respectively. The optimum operational conditions for maximum %TM<sub>rem</sub> were determined at (C<sub>algae</sub> = 4.8 ± 0.2 g<sub>MNPs</sub>.L<sup>−1</sup>, C<sub>t</sub> = 88 ± 1, and pH = 6) using the response surface methodology (RSM). The adsorption of TMs on algae is endothermic, spontaneous, and follows Langmuir and second-order kinetics. Zeta potential measurements indicated that the adsorption mechanism between the toxic metal (TM) and algal strains is controlled by electrostatic interaction. As such, bio-sorption is a sustainable and efficient technology for the removal of TM from wastewater.</p><h2>Other Information</h2><p dir="ltr">Published in: Science of The Total Environment<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.scitotenv.2020.142654" target="_blank">https://dx.doi.org/10.1016/j.scitotenv.2020.142654</a></p> |
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