Prokaryotic community diversity during bioremediation of crude oil contaminated oilfield soil: effects of hydrocarbon concentration and salinity

Camacho-Montealegre, Celia Marcela; Rodrigues, Edmo Montes; Morais, Daniel; Tótola, Marcos Rogério

doi:10.1007/s42770-021-00476-5

Cited by 5 publications

(5 citation statements)

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“…Moreover, pairwise Adonis ( Supplementary Table S3 ) showed significant differences in microbial community structures based on Bray-Curtis distance among all sites ( P < 0.01). These results were consistent with one previous study that soil microbial community structures were significantly shifted by sampling site and pollution level (Camacho-Montealegre et al, 2021 ).…”

Section: Resultssupporting

confidence: 94%

“…These results indicated that high pollution levels would lead to the decline of soil microbial α-diversity. The same result was also observed in similar studies (Camacho-Montealegre et al, 2021 ; Liu et al, 2022 ). For example, Liu et al found that soil bacterial α-diversity was significantly lower under short-term petroleum pollution than under control conditions (Liu et al, 2022 ).…”

Section: Resultssupporting

confidence: 88%

“…Camacho-Montealegre et al . found that soil bacterial and fungal α-diversity decreased with increasing crude oil concentrations, while the relative abundance of microbes from different taxonomic groups showed different change patterns in response to external stress (Camacho-Montealegre et al, 2021 ). These changes could be due to varying resistance to the toxic effects of crude oil and changes in microbial predation activities.…”

Section: Resultsmentioning

confidence: 99%

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Petroleum pollution changes microbial diversity and network complexity of soil profile in an oil refinery

et al. 2023

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IntroductionPetroleum pollution resulting from spills and leakages in oil refinery areas has been a significant environmental concern for decades. Despite this, the effects of petroleum pollutants on soil microbial communities and their potential for pollutant biodegradation still required further investigation.MethodsIn this study, we collected 75 soil samples from 0 to 5 m depths of 15 soil profiles in an abandoned refinery to analyze the effect of petroleum pollution on soil microbial diversity, community structure, and network co-occurrence patterns.ResultsOur results suggested soil microbial a-diversity decreased under high C10–C40 levels, coupled with significant changes in the community structure of soil profiles. However, soil microbial network complexity increased with petroleum pollution levels, suggesting more complex microbial potential interactions. A module specific for methane and methyl oxidation was also found under high C10–C40 levels of the soil profile, indicating stronger methanotrophic and methylotrophic metabolic activities at the heavily polluted soil profile.DiscussionThe increased network complexity observed may be due to more metabolic pathways and processes, as well as increased microbial interactions during these processes. These findings highlight the importance of considering both microbial diversity and network complexity in assessing the effects of petroleum pollution on soil ecosystems.

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Section: Resultssupporting

confidence: 94%

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

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Petroleum pollution changes microbial diversity and network complexity of soil profile in an oil refinery

et al. 2023

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“…The solubility of hydrocarbons decreases with increasing salt concentration (Truskewycz et al, 2019;Hentati et al, 2021b), thus limiting the bioavailability of hydrocarbons to microorganisms (Abed et al, 2006(Abed et al, , 2015Fathepure, 2014). These previous findings might explain why hydrocarbon removal by AK6 dropped to almost half as the salt concentration increased from 0 to 3% (Abed et al, 2015;Camacho-Montealegre et al, 2021;Li et al, 2022). In addition, high salt concentrations are detrimental to microbial life due to perturbation of the cell membrane integrity, poor oxygen solubility, denaturation of proteins as well as desiccation (Abed et al, 2006;Hentati et al, 2021a).…”

Section: Discussionmentioning

confidence: 98%

Biotreatment of oily sludge by a bacterial consortium: Effect of bioprocess conditions on biodegradation efficiency and bacterial community structure

et al. 2022

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We studied the biodegradation of oily sludge generated by a petroleum plant in Bahrain by a bacterial consortium (termed as AK6) under different bioprocess conditions. Biodegradation of petroleum hydrocarbons in oily sludge (C11-C29) increased from 24% after two days to 99% after 9 days of incubation in cultures containing 5% (w/v) of oily sludge at 40°C. When the nitrogen source was excluded from the batch cultures, hydrocarbon biodegradation dropped to 45% within 7 days. The hydrocarbon biodegradation decreased also by increasing the salinity to 3% and the temperature above 40°C. AK6 tolerated up to 50% (w/v) oily sludge and degraded 60% of the dichloromethane-extractable oil fraction. Illumina-MiSeq analyses revealed that the AK6 consortium was mainly composed of Gammaproteobacteria (ca. 98% of total sequences), with most sequences belonging to Klebsiella (77.6% of total sequences), Enterobacter (16.7%) and Salmonella (5%). Prominent shifts in the bacterial composition of the consortium were observed when the temperature and initial sludge concentration increased, and the nitrogen source was excluded, favoring sequences belonging to Pseudomonas and Stenotrophomonas. The AK6 consortium is endowed with a strong oily sludge tolerance and biodegradation capability under different bioprocess conditions, where Pseudomonas spp. appear to be crucial for hydrocarbon biodegradation.

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“…The reason for affecting bacteria may be that temperature affects the permeability of membranes [22]. The effect of salt concentration on degradation is also similar, such as a high concentration of NaCl inhibits the degradation of crude oil by soil microbial communities [37], low concentration of NaCl slightly inhibits the degradation of direct blue 15 (DB15) in wastewater, and high concentration strongly inhibit the degradation [38]. This is consistent with the present study, high salinity led to a hypertonic environment, which may be the main factor affecting bacteria.…”

Section: Discussionmentioning

confidence: 99%

Lysinibacillus sp. GG242 from Cattle Slurries Degrades 17β-Estradiol and Possible 2 Transformation Routes

Hao

Gou

et al. 2022

Microorganisms

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Environmental estrogen pollution has long been a concern due to adverse effects on organisms and ecosystems. Biodegradation is a vital way to remove estrogen, a strain of Lysinibacillus sp. was isolated, numbered strain GG242. The degradation rate of 100 mg·L−1 17β-estradiol (E2)) > 95% in one week, and compared with extracellular enzymes, intracellular enzymes have stronger degradation ability. Strain GG242 can maintain a stable E2 degradation ability under different conditions (20–35 °C, pH 5–11, salinity 0–40 g·L−1). Under appropriate conditions (30 °C, pH 8, 1 g·L−1 NaCl), the degradation rate increased by 32.32% in one week. Based on the analysis of transformation products, inferred E2 was converted via two distinct routes. Together, this research indicates the degradation potential of strain GG242 and provides new insights into the biotransformation of E2.

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Prokaryotic community diversity during bioremediation of crude oil contaminated oilfield soil: effects of hydrocarbon concentration and salinity

Cited by 5 publications

References 58 publications

Petroleum pollution changes microbial diversity and network complexity of soil profile in an oil refinery

Petroleum pollution changes microbial diversity and network complexity of soil profile in an oil refinery

Biotreatment of oily sludge by a bacterial consortium: Effect of bioprocess conditions on biodegradation efficiency and bacterial community structure

Lysinibacillus sp. GG242 from Cattle Slurries Degrades 17β-Estradiol and Possible 2 Transformation Routes

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