Evaluation of flocculating performance of a thermostable bioflocculant produced by marine Bacillus sp

Environmental Technology
Kunle OkaiyetoAnthony I Okoh

Abstract

This study assessed the bioflocculant (named MBF-W7) production potential of a bacterial isolate obtained from Algoa Bay, Eastern Cape Province of South Africa. The 16S ribosomal deoxyribonucleic acids gene sequence analysis showed 98% sequence similarity to Bacillus licheniformis strain W7. Optimum culture conditions for MBF-W7 production include 5% (v/v) inoculum size, maltose and NH4NO3 as carbon and nitrogen sources of choice, medium pH of 6 as the initial pH of the growth medium. Under these optimal conditions, maximum flocculating activity of 94.9% was attained after 72 h of cultivation. Chemical composition analyses showed that the purified MBF-W7 was a glycoprotein which was predominantly composed of polysaccharides 73.7% (w/w) and protein 6.2% (w/w). Fourier transform infrared spectroscopy revealed the presence of hydroxyl, carboxyl and amino groups as the main functional groups identified in the bioflocculant molecules. Thermogravimetric analyses showed the thermal decomposition profile of MBF-W7. Scanning electron microscopy imaging revealed that bridging played an important role in flocculation. MBF-W7 exhibited excellent flocculating activity for kaolin clay suspension at 0.2 mg/ml over a wide pH range of 3-11; wit...Continue Reading

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Citations

Sep 30, 2017·International Journal of Environmental Research and Public Health·Ncedo NtozonkeAnthony I Okoh
Apr 21, 2018·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Mayowa AgunbiadeOmotayo Ashafa
Oct 23, 2019·International Journal of Environmental Research and Public Health·Tsolanku Sidney MalieheNkosinathi Goodman Dlamini
Dec 17, 2020·International Journal of Environmental Research and Public Health·Setyo Budi KurniawanIpung Fitri Purwanti

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Datasets Mentioned

BETA
GU945228.1

Methods Mentioned

BETA
electrophoresis
PCR
Scanning electron microscopy
infrared spectroscopy

Software Mentioned

BLAST
MINITAB Student

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