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Screening for Bioflocculant-Producing Bacteria from the Marine Environment of Sodwana Bay, South Africa

Abstract

Flocculants are chemicals that mediate flocculation process, by aggregating colloids from suspension to form floc. Chemical flocculants are hazardous to the environment, which inform the search for safer and eco-friendly alternatives from microorganisms. Bacterial strains were isolated from water and sediment samples collected from Sodwana Bay, South Africa, and physiological properties of the bacterial strains were observed. Flocculation test using kaolin clay suspension was done on all isolates and the ones that showed flocculating activity were identified molecularly using 16 rRNA gene sequence analysis. Forty marine bacteria isolates were gotten from sediments and water samples collected from Sodwana Bay. Most of the isolates exhibited a range of colony pigmentation (pink, creamy, yellow, and white). After purification of individual isolates, they were screened for their potential to produce bioflocculant. The result revealed that isolates marked SOD3, SOD10, SOD12, SOD26, SOD27, SOD28, SOD32, SOD33 and SOD34 produced bioflocculants as shown by the flocculating activities from their crude extract. All these isolates showed good flocculation of kaolin clay suspension above 60% (flocculating activity) except SOD12. These bioflocculant producing isolates were identified as Pseudoalteromonas sp, Alcaligenes faecalis, Bacillus subtilis, Bacillus cereus, Bacillus stratosphericus. The results showed Sodwana Bay, South Africa as a reservoir of bacteria with potential to produce flocculants. However, further studies on the optimisation of culture conditions for bioflocculant production, extraction, characterisation and application of isolates is on the way to underscore the biotechnological importance of these microbes as producers of substitutes to harmful chemical flocculants commonly used in water and wastewater treatment.

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Escherichia coli as Possible Agents of Spread of Multidrug Resistance in Port Harcourt, Rivers State.

Salmonella 4,5,12:i:−, Escherichia coli and Klebsiella pneumoniae on a UK pig farm. J Antimicrob Chemother., 69(8), 2098-2101. Horsfall, S.J., Abbey, S.D., Nwokah, E.G., and Okonko, I.O., 2017. Prevalence of Extended-Spectrum Beta-lactamases (ESBLs) and Plasmid status of Escherichia coli and Klebsiella pneumoniae isolates from clinical sources in UPTH, Port-Harcourt, Nigeria. New York Sci J., 10(3), 29 - 39 Jacoby, G.A., Strahillevitz, J., and Hooper, D.C., 2014. Plasmid-mediated quinolone resistance. Microbiol Spectr., 2(2), doi:10.1128/microbiolspec

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Carbonaceous Soot from Thermal Decomposition of Kerosene: A Pioneering Report for Paint Preservation

multiplex PCR using species-specific primers based on the region extending from 16S rRNA through 23S rRNA. FEMS microbiology letters 250, 55-62. Martinez, K., Ferrer, I., Hernando, M., Fernández-Alba, A.R.g., Marcé, R.M., Borrull, F., Barcelo, D., 2001, Occurrence of antifouling biocides in the Spanish Mediterranean marine environment. Environmental technology 22, 543-552. McPherson, M., Moller, S., Graham, A. 2000. PCR; The Basics Bios (Scientific Publishers Ltd). Ohwoavworhua, F., Adelakun, T., 2005, Phosphoric acid-mediated depolymerization and

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Evaluation of Some Salicylaldehyde-derived Baylis-Hillman Adducts and Coumarin Derivatives as Potential Antisickling Compounds

. Examining the characteristics and beliefs of hydroxyurea users and nonusers among adults with sickle cell disease. Am. J. Hematol ., 86 (1), 85-87. He, J.-Y., Zhang, W., He, L.-C. and Cao, Y.-X., 2007. Imperatorin induces vasodilatation possibly via inhibiting voltage dependent calcium channel and receptor-mediated Ca 2+ influx and release. Eur. J. Pharmacol ., 573 , 170-175. Hoban, M.D., Orkin, S.H. and Bauer, D.E., 2016. Genetic treatment of a molecular disorder: gene therapy approaches to sickle cell disease. Blood , 127 (7), 839-848. Hoult

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Influence of the Techniques and Degrees of Ripeness on the Nutritional Qualities and Carotenoid Profiles of Tomatoes (Solanum lycopersicum).

., Fogliano, V., Ambrosino, P., Salucci, M., Gennaro, L., Bugianesi, R., Giuffrida, F., Quaglia, G.J., 2002, Nutritional value of cherry tomatoes ( Lycopersicon esculentum Cv. Naomi F1) harvested at different ripening stages. Journal of Agricultural and Food Chemistry, 50 (22): 6550-6556. Raiola, A., Rigano, M.M., Calafiore, R., Frusciante, L., Barone, A., 2014, Enhancing the health-promoting effects of tomato fruit for biofortified food. Mediators of Inflammation, 2014 ; ID 139873 (1-16). Rao, A.V., Zeeshan, W., Sanjiv, A., 1998, Lycopene content of

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