Effects of drilling fluids on marine bacteria from a Nigerian offshore oilfield

Okpokwasili, G. C.; Nnubia, C.

doi:10.1007/bf02471943

Cited by 12 publications

(7 citation statements)

References 11 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This could be as a result of continues discharge of petroleum products into the wastewater pond. It has been reported by several researchers that continuous discharges of crude oil into the ecosystem may result in selective increase or decrease in microbial population [22,23]. There was significant difference (P<0.05) between the THB and HUB in the various samples.…”

Section: Discussionmentioning

confidence: 72%

Response of Soil Microorganisms to Oilfield Wastewater

Owhonka

Obire

2019

JAMB

View full text Add to dashboard Cite

Environmental pollution resulting from oil exploitation and exploration has impacted negatively on the biodiversity of the affected areas. Therefore, this study investigated the response of soil microorganisms to oilfield wastewater. The oilfield wastewater and soil samples were collected from an onshore oil producing platform fortnightly for a period of three months and microbiological analyses were performed using standard methods. Soil around pond average counts for THB and HUB (Log10 CFU/g) were 7.32 to 7.35 and 4.16 to 4.22 respectively. Soil 80 m away from pond average range for THB and HUB were 7.38 to 7.40 and 3.32 to 3.34 respectively. For TF and HUF, Soil around the pond mean recorded 4.65 to 4.85 and 4.12 to 4.16 (Log10 CFU/g) respectively. Mean monthly counts for soil 80m away TF and HUF (Log10 CFU/g) were 5.03 to 5.05 and 3.26 to 3.34 respectively. Soil around the pond recorded lower total heterotrophic bacteria count and total fungi count but higher hydrocarbon utilizing bacteria and hydrocarbon utilizing fungi than soil 80 m away. There was significant difference (P<0.05) between the THB and HUB in the various samples. For the fungi count there was no significant difference (P>0.05) between TF and HUF in all the samples except in sample obtained from soil 80 m away from pond. Bacteria species isolated from the study include: Bacillus, Aeromonas, Micrococcus, Staphylococcus, Chryseomonas, Proteus, Pseudomonas, Klebsiella. Apart from Aeromonas and Chryseomonas the rest of the isolate were identified also as hydrocarbon utilizing bacteria. While fungi species isolated includes: Aspergillus fumigates, Aspergillus niger, Aspergillus flavus, Saccharomyces cerevisiae, Geotricum, Trichoderma, Fusarium and Penicillium. Hydrocarbon utilizing fungi that occurred includes: Aspergillus niger, Aspergillus flavus, Fusarium, Penicillium and Saccharomyces cerevisiae. The response of these microorganisms in the oil polluted environment suggests that the isolated bacteria and fungi could utilize the oil as energy and carbon source and could be effective in the cleanup of the polluted sites.

show abstract

Section: Discussionmentioning

confidence: 72%

Response of Soil Microorganisms to Oilfield Wastewater

Owhonka

Obire

2019

JAMB

View full text Add to dashboard Cite

show abstract

“…Bacteria play a major role in hydrocarbon degradation in aquatic environments. The presence of these hydrocarbon degraders in the river might result in co-oxidation, commensalitic, or complimentary degradation of the hydrocarbons in the aquatic ecosystem (Perry, 1979;Okpokwasili and Nnubia, 1995). However, the hydrocarbonoclastic fungi (HUF) counts did not change between both seasons.…”

Section: Discussionmentioning

confidence: 99%

Seasonal dynamics of microbial population and physicochemical characteristics of a water body receiving industrial pollutants in Port Harcourt, Nigeria.

Ogbonna¹

2010

ABJNA

View full text Add to dashboard Cite

Microbial quality and physicochemical indices of an Imo river, Nigeria, receiving industrial pollutants were investigated during the periods of July 2007 and March 2009.Results show that mean counts for THB and THF of the river system were higher in the wet season than in the dry season. THB showed mean bacterial counts of 2.60x10 2 ±0.058 cfu/ml and 1.60x10 2 ±0.024 cfu/ml for wet and dry seasons respectively while THF had 6.0x10 1 ±0.029 cfu/ml for wet season and 3.0x10 1 ±0.16 cfu/ml for dry season. The mean HUB populations were 1.80x10 2 ±0.048 cfu/ml and 0.90x10 2 ±0.21 cfu/ml for wet and dry seasons respectively while HUF had similar microbial counts in both seasons. The physico-chemical characteristics show that the water body was highly turbid with values ranging between 154.5±14.3 and 58.5±11.2 NTU for the wet and dry seasons respectively. Other parameters such as TDS, total alkalinity, conductivity, free carbon and sulphate showed similar patterns of variation with low values for pH. The influence of physicochemical parameters on the microbial abundance showed that at P≤0.05, only Total Hydrocarbon, Conductivity and Nitrate correlated positively with HUF and did not show correlation for other microbial groups. Apart from the HUB, and HUF the highest counts also observed for THB and THF confirm that hydrocarbon pollution do not only enrich hydrocarbon utilizers but also for additional populations that utilize the byproducts as sources of nutrients.

show abstract

“…Although the biodegradation process of many phenolic compounds have been extensively studied it is very difficult to obtain the data where o-cresol is used as a single carbon source. The ability to biodegrade any chemical highly depend on different physical and nutrient factors [10]. It is very important to understand the optimum conditions required by the organism for the complete Mineralization of the chemical compounds so that the efficiency of their degradation capacity could be improved.…”

Section: Introductionmentioning

confidence: 99%

Optimization of o-cresol degrading microorganism and kinetics of degradation

Shainy¹,

Usha

2018

Indones. J. Chem.

View full text Add to dashboard Cite

In the present study, Pseudomonas monteilii CR13 isolated from petroleum contaminated soil demonstrated the highest specific o-cresol degradation rate at all tested o-cresol concentrations and also was not disturbed by the starting substrate concentration used (o-cresol-500 mg/L). After a serial transfer of the isolate into a series of increasing o-cresol level, the organism demonstrated significant improvement on degradation ability up to 3000 mg/L. The optimum condition for the cell mass increase and biodegradation of o-cresol by Pseudomonas monteilii was in the minimal mineral medium of 3 at a pH of 6.5 and temperature 30 °C, stirring velocity of 160 rpm, and the substrate concentration of 500 mg/L. The biodegradation kinetic study was carried out by bacteria in different initial substrate concentrations (500–3000 mg/L). In the present test the μmax, Ks and the μ were found 0.332 h-1, 0.166 mg/L and 0.0282 mg/L for 500 mg/L of o-cresol, respectively. The organism is highly promising and could be used to remove high concentrations of o-cresol from highly polluted aquatic and soil regions. The cells could be immobilized on a suitable matrix and the efficiency of degradation could be effectively improved.

show abstract

Effects of drilling fluids on marine bacteria from a Nigerian offshore oilfield

Cited by 12 publications

References 11 publications

Response of Soil Microorganisms to Oilfield Wastewater

Response of Soil Microorganisms to Oilfield Wastewater

Seasonal dynamics of microbial population and physicochemical characteristics of a water body receiving industrial pollutants in Port Harcourt, Nigeria.

Optimization of o-cresol degrading microorganism and kinetics of degradation

Contact Info

Product

Resources

About