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1

Bioflocculant production by a consortium of two bacterial species and its potential application in industrial wastewater and river water treatment

100%
Cosa S., Okoh A.
Polish Journal of Environmental Studies
|
2014
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tom 23
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nr 3
We assessed the bioflocculant production potentials of a consortium of two marine bacterial species belonging to the Oceanobacillus and Halobacillus genera, isolated from sediment samples of Algoa Bay in the Eastern Cape Province of South Africa. Cell free culture broth of the consortium had a flocculating activity of 98.3%, which is higher than those of pure cultures of the individual species. The purified bioflocculant was more efficient (optimum dose 0.2 mg·ml⁻¹) in the flocculation of kaolin suspension (4 g·l⁻¹) compared to polyelectrolyte (optimum dose 0.3 mg·ml⁻¹) and alum (optimum dose 1 mg·ml⁻¹), which are both commercially available coagulants. A neutral pH condition and the presence of Ca²⁺ as cation resulted in optimum activity of the bioflocculant. Also, the purified bioflocculant removed chemical oxygen demand (COD) in brewery wastewater, dairy wastewater, and river water at efficiencies of 99.7, 99.9, and 63.5%, respectively, and also reduced their turbidity by 93.9, 88.3, and 98.6%, respectively. Composition analysis revealed the bioflocculant to be mainly polysaccharide with an amorphous-crystal-like structure. FTIR spectra revealed the presence of carboxyl, hydroxyl, and amino groups in its thermo-stability test, suggesting a thermostable bioflocculant.
2

Characterizing bacteria and methanogens in a balloon[type digester fed with dairy cattle manure for anaerobic mono-digestion

81%
Manyi-Loh C., Mamphweli S., Meyer E., Okoh A.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 3
In this study, bacteria and methanogens involved in the decomposition of dairy cattle manure have been characterized via cultivation on selective microbiological media by the viable plate count technique. In addition, DNA was extracted from digested samples, and the 16S rRNA gene was amplified using six primer sets specific to bacterial and archaeal domain via PCR. The sequences of the PCR products were determined and compared to similar sequences in the GenBank database using the BLASTN tools to identify the closest relatives. By culture, E. coli, Salmonella, Shigella, and Campylobacter species were identified and belonged to the phylum Proteobacteria. Following, 16S rRNA analysis, Firmicutes (80%) was the most dominant bacterial phylum represented by the predominant order Clostridiales and genus Clostridium. Other members belonged to the phyla Proteobacteria and Spirochaetes. The phylum Euryarchaeota (100%) was the only observed archaeal domain with members that belonged to the dominant class Methanomicrobia and genus Methanocorpusculum. Other members were related to the order Methanobacteriales and Methanosarcinales. Results suggested that Clostridium sp, Clostridium related organisms, and other acidogens were responsible for the deconstruction of biomass-generating substrates metabolized by Methanocorpusculum and Methanobrevibacter species to produce methane via the fundamental hydrogenotrophic pathway
3

Peroxidases produced by new ligninolytic Bacillus strains isolated from marsh and grassland decolourized anthraquinone and azo dyes

81%
Falade A., Mabinya L., Okoh A., Nwodo U.
Polish Journal of Environmental Studies
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2019
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tom 28
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nr 5
The biotechnological relevance of ligninolytic organisms remains topical and may remain so in the foreseeable future. The enzyme battery produced by ligninolytic bacteria, including Bacillus species, has shown immense industrial significance. Consequently, peroxidases produced by newly isolated ligninolytic Bacillus strains from the marsh and grassland in Hogsback forest reserve of the Eastern Cape Province of South Africa were evaluated for decolourization of anthraquinone (Remazol Brilliant Blue R-RBBR) and azo (Congo Red-CR) dyes. Maximum dye decolourization was observed with the peroxidase from Bacillus sp. NWODO-3: CR (69.89±2.64 %) and RBBR (72.12±0.38 %). Dye decolourization readings for peroxidases from the other Bacillus strains were CR: 55.06±5.48 %, RBBR: 70.45±0.0 % (Bacillus sp. MABINYA-1), 42.62±5.55 % and 42.42±4.82 % against CR for Bacillus sp. MABINYA-2 and Bacillus sp. FALADE-1, respectively. RBBR was less susceptible to the attack by crude peroxidase produced by Bacillus sp. MABINYA-2 and Bacillus sp. FALADE-1 as the dye decolourization activities observed were 4.91±0.36 % and 1.19±0.0 %, respectively. These results suggest the industrial relevance of peroxidases from the new ligninolytic Bacillus strains in bioremediation.
4

Physicochemical properties and total coliform distribution of selected rivers in Osun State, Southwestern Nigeria

71%
Titilawo Y., Akintokun A., Adeniyi M., Olaitan J., Okoh A.
Polish Journal of Environmental Studies
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2019
|
tom 28
|
nr 6
5

Evaluating Nahoon Beach and canal waters in Eastern Cape, South Africa: a public health concern

61%
Ebomah K., Sibanda T., Adefisoye M., Nontongana N., Nwodo U., Okoh A.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 3
Contamination of water resources by pathogens due to ever increasing anthropogenic activities and the related disease burden remains a major concern of water quality globally. This study evaluated the physicochemical and microbiological quality indices of Nahoon Beach and its canal waters in South Africa over a period of 12 months (September 2014 to August 2015). Water samples were collected bi-weekly from 6 sampling points (3 on the beach and 3 on the canal) and analyzed using standard methods. The physicochemical qualities of the beach and canal waters ranged as follows: turbidity 3.3-99.9 NTU, temperature 15-25ºC, pH 7-10, electrical conductivity 30.0–741.7 µS/cm, and total dissolved solids 19-546 mg/l. As for microbial counts of the water samples, Escherichia coli counts ranged in the order of 10¹-10³ CFU/100 ml while Enterococcus counts varied in the order of 10¹-10² CFU/100 ml. This study underscores the need for the protection of recreational water resources to safeguard public health.
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