Assessment and bioremediation of heavy metals from crude oil contaminated soil by earthworms

Ekperusi, Abraham Ogheneruemu; Aigbodion, Iruobe Felix; Iloba, B.N.; Okorefe, S.

doi:10.4314/ejesm.v9i2.9s

Cited by 16 publications

(12 citation statements)

References 7 publications

(8 reference statements)

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Section: Resultsmentioning

confidence: 99%

Bioremediation of clay with high oil content and biological response after restoration

et al. 2021

Sci Rep

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The clay with high oil content form soil lumps, which is hard for microbes to repair. In this paper, the bioaugmentation and biostimulation technology were applied to improve the bioremediation effect of the soil with high oil content, that modified by local cow dung and sandy soil, the ecological toxicity of the soil after restoration was further analyzed. After 53 days of bioremediation, the degradation efficiency with respect to the total petroleum hydrocarbons (TPH) content reached 76.9% ± 2.2%. The soil bacterial count of M5 group reached log10 CFU/g soil = 7.69 ± 0.03 and the results were better than other experimental groups. The relative abundances of petroleum-degrading bacteria added to M5 remained high (Achromobacter 9.44%, Pseudomonas 31.06%, and Acinetobacter 14.11%), and the proportions of some other indigenous bacteria (Alcanivorax and Paenibacillus) also increased. The toxicity of the bioremediated soil was reduced by seed germination and earthworm survival experiments.

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Section: Resultsmentioning

confidence: 99%

Bioremediation of clay with high oil content and biological response after restoration

et al. 2021

Sci Rep

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“…Therefore, earthworms were used to assess environmental risks in several experiments. Some experiments used earthworm biomass, quantity and survival rate to assess the toxicity of oil contaminant in different ecological systems [Geissen et al, 2008;Ekperusi et al, 2017]. Figure 7a presents the survival rates of earthworms after 3 and 6 d in all the treatment groups.…”

Section: Acute Toxicity Test In Earthwormsmentioning

confidence: 99%

Bioremediation of Clay With High Oil Content and Biological Response After Restoration

Qu³

et al. 2020

Preprint

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The clay with high oil content form soil lumps, which is hard for microbes to repair. In this paper, the bioremediation + biostimulation was applied to improve the bioremediation effect of the soil with high oil content, that modified by local cow dung and sandy soil, the ecological toxicity of the soil after restoration was further analyzed. After 53 days of bioremediation, the degradation efficiency with respect to the total petroleum hydrocarbon (TPH) content reached 76.9% ± 2.2%; the soil bacterial content reached 4.9 × 107 CFU/g soil and the results were better than those in the natural attenuation M1group of experimental soils. The relative abundances of petroleum-degrading bacteria added to M5 remained high (Achromobacter 9.44%, Pseudomonas 31.06%, and Acinetobacter 14.11%), and the proportions of some other indigenous bacteria (Alcanivorax and Paenibacillus) also increased. The toxicity of the bioremediated soil was reduced by seed germination and earthworm survival experiments.

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“…This adaptive measure enables the organisms to source their nutrients from the components of the crude oil. When the response is negative, the bacterial species are sensitive to the components of the crude oil, so they cannot withstand the stress, which may result to their complete elimination from the habitat [4].…”

Section: Introductionmentioning

confidence: 99%

“…Crude oil contamination drastically enhances heavy metal concentration in soil and water bodies [4]. Heavy metals such as zinc, chromium, nickel, mercury, iron and copper are components of crude oil, though in low concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Bacteriological and heavy metal evaluation of abandoned crude oil–contaminated sites in Gio community, Ogoniland, Nigeria

Maduwuba¹,

Okpokwasili²,

Ibiene³

2021

GSC Biol. and Pharm. Sci.

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The environmental pollution in the Niger Delta has been a course of concern. Microorganisms such as bacteria have proved to be of great benefit in the degradation of petroleum derived hydrocarbons. This study evaluated the bacteriological and heavy metal concentration of abandoned crude oil–contaminated sites in Gio community, Ogoniland, Nigeria. Soil, water, and sediment samples were collected from the sites. pH and selected heavy metals in the samples were monitored. Isolation and biochemical characterization were done to determine the heterotrophic and hydrocarbon utilizing bacteria present in the samples. Soil and sediment samples had pH values of 4.80±0.04 and 4.8±0.07 respectively while the surface and ground water samples had pH values of 6.40±0.216 and 6.50±0.01. Iron had the highest heavy metal concentration in all the samples, especially the sediment (1000.80±0.01 mg/kg) while copper and lead had the lowest concentration of < 0.001mg/kg in all the samples except sediment sample. The total petroleum hydrocarbon in the soil (9114.86±0.036 mg/kg), exceeded DPR intervention limit while sediment (1034.46±0.022 mg/kg), surface water (2.515±0.003 µg/L) and ground water sample (32.38±0.99 µg/L) were below DPR’s limit. The soil sample had the highest total culturable heterotrophic bacterial counts and total culturable hydrocarbon utilizing bacterial counts of 5.20 ± 0.21 X 108 CFU/g and 4.00 ± 0.11 X 107 CFU/g, respectively. The following heterotrophic bacteria were isolated and identified from the samples; Pseudomonas spp, Bacillus spp, Acidiphilium spp, Acidibrevibacterium spp and Leptospirillum spp. This study has shown the presence of indigenous resident bacteria which possess the ability to degrade hydrocarbons. These bacteria can be improved through bioaugmentation and bio stimulation for the bioremediation of these sites.

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Assessment and bioremediation of heavy metals from crude oil contaminated soil by earthworms

Abstract: Abstract

Cited by 16 publications

References 7 publications

Bioremediation of clay with high oil content and biological response after restoration

Bioremediation of clay with high oil content and biological response after restoration

Bioremediation of Clay With High Oil Content and Biological Response After Restoration

Bacteriological and heavy metal evaluation of abandoned crude oil–contaminated sites in Gio community, Ogoniland, Nigeria

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