Microbial eco-physiological strategies for salinity-mediated crude oil biodegradation

Cao, Yiqi; Zhang, Baiyu; Zhu, Zhiwen; Song, Xing; Cai, Qinhong; Chen, Bing; Dong, Guihua; Ye, Xudong

doi:10.1016/j.scitotenv.2020.138723

Cited by 50 publications

(16 citation statements)

References 56 publications

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“…NSM contained 20% (v/v) seawater instead of 100% seawater, as in MNSW, indicating that salinity is one of many factors that impacts crude oil removal efficiency. Similarly, Cao, et al 44 reported that an increase in salinity affected the behavior of the oil-degrading bacteria Exiguobacterium sp. N4 − 1P, and the highest degradation and biofilm formation were observed at a salinity of 15 g L −1 .…”

Section: Resultsmentioning

confidence: 91%

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Biodegradation of crude oil by immobilized Exiguobacterium sp. AO-11 and shelf life evaluation

Sakdapetsiri

Kaokhum

Pinyakong

2021

Sci Rep

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Exiguobacterium sp. AO-11 was immobilized on bio-cord at 109 CFU g−1 carrier for the removal of crude oil from marine environments. To prepare a ready-to-use bioremediation product, the shelf life of the immobilized cells was calculated. Approximately 90% of 0.25% (v/v) crude oil removal was achieved within 9 days when the starved state of immobilized cells was used. The oil removal activity of the immobilized cells was maintained in the presence of oil dispersant (89%) and at pH values of 7–9. Meanwhile, pH, oil concentration and salinity affected the oil removal efficacy. The immobilized cells could be reused for at least 5 cycles. The Arrhenius equation describing the relationship between the rate of reaction and temperature was validated as a useful model of the kinetics of retention of activity by an immobilized biocatalyst. It was estimated that the immobilized cells could be stored in a non-vacuum bag containing phosphate buffer (pH 7.0) at 30 °C for 39 days to retain the cells at 107 CFU g−1 carrier and more than 50% degradation activity. These results indicated the potential of using bio-cord-immobilized crude oil-degrading Exiguobacterium sp. AO-11 as a bioremediation product in a marine environment.

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Section: Resultsmentioning

confidence: 91%

“…This finding was consistent with a report of naturally existing bacteria isolated from seawater whose crude oil degradation efficiency reached a maximum value at a salinity of approximately 30‰ 7 . Furthermore, salinity strongly affects the behavior of oil-degrading bacteria and biofilm formation 44 .…”

Section: Resultsmentioning

confidence: 99%

Biodegradation of crude oil by immobilized Exiguobacterium sp. AO-11 and shelf life evaluation

Sakdapetsiri

Kaokhum

Pinyakong

2021

Sci Rep

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“…However, it can be limited by the environmental conditions and/or the endogenous microbial species present at any given location, especially in soil environments (Fuentes et al, 2016). For instance, salinity can have a major effect on biodegradation, requiring the presence of halotolerant species to be overcome (Cao et al, 2020). To counteract these issues, approaches such as biostimulation and bioaugmentation have been proposed to enhance microbial activity (Wu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Specific enrichment of hydrocarbonclastic bacteria from diesel-amended soil on biochar particles

Assil

Esegbue

Mašek

et al. 2021

Science of The Total Environment

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HIGHLIGHTS• Biochar was evaluated for the biostimulation of hydrocarbon contaminated soils.• Amplicon sequence variants (ASVs) reveal specific soil microbial responses to oil.• Oil amplifies 13 ASVs -putative hydrocarbon degraders -to high relative abundance.• Standard biochars reduce soil diversity loss and are enriched in oil-selected ASVs.• Biochar enriched with endogenous microbes is a promising approach to bioremediation.

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“…To analyze the BPA degradation intermediates in the MnO 2 /UV/PS process, the reaction solutions (at 0, 5, 15, 30, 60, 90, and 120 min) were analyzed using Agilent 7890 GC coupled with an Agilent 5975 MS (Agilent technologies, Mississauga, ON, Canada). The details of BPA extraction, derivatization, and GC-MS analysis methods were based on previous studies [30,58,59] (Text S3).…”

Section: Intermediates Analysismentioning

confidence: 99%

UV Stimulated Manganese Dioxide for the Persulfate Catalytic Degradation of Bisphenol A

et al. 2021

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One of the most commonly produced industrial chemicals worldwide, bisphenol A (BPA), is used as a precursor in plastics, resins, paints, and many other materials. It has been proved that BPA can cause long-term adverse effects on ecosystems and human health due to its toxicity as an endocrine disruptor. In this study, we developed an integrated MnO2/UV/persulfate (PS) process for use in BPA photocatalytic degradation from water and examined the reaction mechanisms, degradation pathways, and toxicity reduction. Comparative tests using MnO2, PS, UV, UV/MnO2, MnO2/PS, and UV/PS processes were conducted under the same conditions to investigate the mechanism of BPA catalytic degradation by the proposed MnO2/UV/PS process. The best performance was observed in the MnO2/UV/PS process in which BPA was completely removed in 30 min with a reduction rate of over 90% for total organic carbon after 2 h. This process also showed a stable removal efficiency with a large variation of pH levels (3.6 to 10.0). Kinetic analysis suggested that 1O2 and SO4•− played more critical roles than •OH for BPA degradation. Infrared spectra showed that UV irradiation could stimulate the generation of –OH groups on the MnO2 photocatalyst surface, facilitating the PS catalytic degradation of BPA in this process. The degradation pathways were further proposed in five steps, and thirteen intermediates were identified by gas chromatography-mass spectrometry. The acute toxicity was analyzed during the treatment, showing a slight increase (by 3.3%) in the first 30 min and then a decrease by four-fold over 2 h. These findings help elucidate the mechanism and pathways of BPA degradation and provide an effective PS catalytic strategy.

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Microbial eco-physiological strategies for salinity-mediated crude oil biodegradation

Cited by 50 publications

References 56 publications

Biodegradation of crude oil by immobilized Exiguobacterium sp. AO-11 and shelf life evaluation

Biodegradation of crude oil by immobilized Exiguobacterium sp. AO-11 and shelf life evaluation

Specific enrichment of hydrocarbonclastic bacteria from diesel-amended soil on biochar particles

UV Stimulated Manganese Dioxide for the Persulfate Catalytic Degradation of Bisphenol A

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