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Response of Soil Microbial Isolates to the Toxicity of Green Surfactant

100%
Iroegbu D. I., Adieze I. E., Nwanyanwu C. E., Mejeha O. K., Sinee B.
World News of Natural Sciences
|
2024
|
vol. 52
12-22
EN
In this study, microorganisms were obtained from hydrocarbon-polluted and unpolluted soil samples using Nutrient agar and Bushnell Hass agar for the enumeration of heterotrophic bacteria and hydrocarbon-utilizing bacteria respectively.The response of hydrocarbons utilizing soil bacterial isolates to the toxicity of green surfactant was assayed. The hydrocarbons utilizing bacterial isolates in soil extract broth were exposed to different concentrations; (1, 2, 3, 4, and 5) % w/v of green surfactants, and their responses (cell growth and viability) were time-dependent and monitored using spectrophotometer and total viable count. These hydrocarbon-utilizing bacteria isolates were two different species of Micrococcus (C and D), Bacillus sp. (F2) and Pseudomonas sp. (A2). They showed good response to high concentrations (4 and 5%) of the green surfactant in soil extract broth. This could be a result of a component of the green surfactant such as phosphorus which is an essential nutrient for microbial growth. Hence these tolerated green surfactant concentrations could be recommended to be used as surface active agents to enhance the bioavailability of hydrocarbon to microorganisms for bioremediation practices of hydrocarbon-contaminated sites.
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Bacteriological Evaluation of Hydrocarbon Polluted Soil in Obitti Oil Field, Ohaji-Egbema, Imo State, Nigeria

86%
Maduwuba M. C., Akwarandu J. O.
World News of Natural Sciences
|
2023
|
vol. 49
137-146
EN
The bacteriological evaluation of hydrocarbon polluted soil in Obitti oil field in Ohaji Egbema was investigated to ascertain the presence of bacterial community in crude oil-polluted soil. Ohaji Egbema has experienced crude oil pollution in recent times due to the presence of crude oil exploration facilities including the Obitti oil field. Soil samples were collected from four (4) different points within the oil field with varying degree of crude oil pollution along with their corresponding control samples (unpolluted soil). The total culturable heterotrophic bacteria (TCHB), total culturable hydrocarbon utilizing bacteria (TCHUB), pH and total petroleum hydrocarbon (TPH) concentrations were monitored using standard procedures. The total culturable heterotrophic bacterial count ranged from 0.45±2.0x105 Cfu/g to 2.12±2.6x105 Cfu/g while total culturable hydrocarbon utilizing bacterial count ranged from 0.56±2.1x104 Cfu/g to 1.35±2.6x103 Cfu/g. pH ranged from 0.11±4.0 to 1.10±5.0 for the polluted soil samples while a range of 0.10±5.7 to 1.00±7.2 was recorded for the control samples. The TPH analysis revealed a high concentration of 9.51±5747.13 mg/kg to 3.45±7214.82 mg/kg for polluted soil samples which is above the DPR intervention limit of 5000 mg/kg for soils while the control samples recorded a range of 5.41±3118.29 mg/kg to 8.21±4285.02 mg/kg. This study has therefore revealed the ability of indigenous bacterial population to strive despite crude oil pollution and as such these hydrocarbon impacted sites can be harnessed for the isolation of hydrocarbonoclastic bacteria which can serve as a bio-resource for the effective bioremediation of hydrocarbon impacted environment.
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