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Author: search.filters.author.Choochote, SakchaiSubject: search.filters.subject.Polysaccharide

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    Effects of low pH and Pb2+ stress on living cyanobacterium, Phormidium angustissimum West & G.S.West: A test of its feasibility as a living biosorbent
    (2013-06-01)
    Ruangsomboon, Suneerat
    ;
    Wongrat, Ladda
    ;
    Choochote, Sakchai
    ;
    Ganmanee, Monthon
    ;
    Saparnklang, Atiya
    Pb<sup>2+</sup> adsorption by the living cyanobacterium, Phormidium angustissimum followed the Langmuir adsorption model, with the maximum adsorption capacity (q <inf>max</inf>) of 295.4 ± 13.8 mg g<sup>-1</sup>. This result suggests that P. angustissimum is a promising living biosorbent to remove Pb<sup>2+</sup> from wastewaters. Living biosorbents are better able to remove Pb<sup>2+</sup> from wastewater than dead biosorbents, however there are practical limitations for their use are encountered in extreme conditions such as low pH and high Pb<sup>2+</sup> concentration. The feasibility of using cyanobacterium, P. angustissimum, as a living biosorbent for the extraction of Pb<sup>2+</sup> from wastewater was studied by investigating its photosynthestic performance and tolerance under Pb<sup>2+</sup> (0-5 mg L<sup>-1</sup>) contamination and low pH (pH 3-7). Decreased photosynthetic performance caused by Pb<sup>2+</sup> contamination and low pH stress was detected in this study by means of a reduction of the maximum photochemical efficiency of PSII (F<inf>v</inf>/F<inf>m</inf>). Detoxification mechanisms of P. angustissimum on Pb<sup>2+</sup> appeared to increase its intracellular polysaccharides (IPS), exocellular polysaccharides (EPS), and protein. Living P. angustissimum could increase the pH of the solution which resulted in Pb<sup>2+</sup> precipitation. The unique ability of P. angustissimum to remove Pb<sup>2+</sup> and to grow under toxic conditions, demonstrated herein, indicates that it is a promising living biosorbent for mildly acidic water contaminated with Pb<sup>2+</sup> in bioremoval systems in the which pH is not lower than 5 and Pb<sup>2+</sup> is not higher than 5 mg L<sup>-1</sup>. © 2013 Springer Science+Business Media Dordrecht.