Ruangsomboon, Suneerat

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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
Pb2+ 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-1. This result suggests that P. angustissimum is a promising living biosorbent to remove Pb2+ from wastewaters. Living biosorbents are better able to remove Pb2+ from wastewater than dead biosorbents, however there are practical limitations for their use are encountered in extreme conditions such as low pH and high Pb2+ concentration. The feasibility of using cyanobacterium, P. angustissimum, as a living biosorbent for the extraction of Pb2+ from wastewater was studied by investigating its photosynthestic performance and tolerance under Pb2+ (0-5 mg L-1) contamination and low pH (pH 3-7). Decreased photosynthetic performance caused by Pb2+ 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 Pb2+ 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 Pb2+ precipitation. The unique ability of P. angustissimum to remove Pb2+ and to grow under toxic conditions, demonstrated herein, indicates that it is a promising living biosorbent for mildly acidic water contaminated with Pb2+ in bioremoval systems in the which pH is not lower than 5 and Pb2+ is not higher than 5 mg L-1. © 2013 Springer Science+Business Media Dordrecht.
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Enhanced production of polysaccharides and protein content in cyanobacterium, Oscillatoria limnetica as a defense mechanism against low pH and Pb2+
(2015-01-01)
Ruangsomboon, Suneerat
Living biomass has better ability to remove Pb2+from wastewaters as compare to dead biomass. But, living biomass also have some practical limitations, such as, they are not efficient at low pH, and at high concentrations of metal ions. In the present study living biomass of Os cilia tori a Uni tie tic a was assessed for its metal sorption capacity. O. Bmnetica considerably sorbed a laige amount of Pb2+within pH range 3-7. The maximum Pb2+sorption capacity of 0. Unmetica was 434.78 mg/g. As photochemical efficiency data depicted, Pb2+exerted inhibitory effects on photosynthesis of the test cyanobacterium. However, the test cyanobacterium showed considerable tolerance to Pb2+exposure as concentration increased from 0 to 5 mg /L. Defense mechanisms of 0. Bmnetica under Pb2+enriched condition is probably associated with greater accumulation of intracellular polysaccharides (IPS) and protein. Nonetheless, since Pb2+binding capacity of 0. limnetica is significantly high than that of several other biosorbents, it can be considered as a promising biomaterial for removal of Pb2+from wastewaters.

Ruangsomboon, Suneerat

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