A PAH-degrading bacterial community enriched with contaminated agricultural soil and its utility for microbial bioremediation

Lu, Chao; Yang, Hong; Liu, Juan; Gao, Yanzheng; Ma, Zhao; Yang, Bing; Ling, Wanting; Waigi, Michael Gatheru

doi:10.1016/j.envpol.2019.05.044

Cited by 200 publications

(87 citation statements)

References 47 publications

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“…PAHs have generated extreme concern due to their toxicity, teratogenicity, carcinogenicity, and mutagenesis to humans and the wider environment. They are mainly released by incomplete combustion of fossil fuels or activities in the petrochemical industry, including crude oil refining, coal tar production, and asphalt production [4,5]. Owing to their high hydrophobicity and persistence, soils are the ultimate repository of PAHs with concentration up to hundreds of mg/kg in many countries [6,7].…”

Section: Introductionmentioning

confidence: 99%

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

et al. 2019

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The availability of bound residues of polycyclic aromatic hydrocarbons (PAHs), in reference to their parent compounds, can be enhanced by microbial activity and chemical reactions, which pose severe risks for the ecosystems encompassing contaminated soils. Considerable attention has been raised on how to remove these bound residues from PAH-contaminated soils. This paper provides a novel application of Fenton oxidation in the removal of bound residues of model PAHs, such as naphthalene (NAP), acenaphthene (ACP), fluorene (FLU) and anthracene (ANT), from naturally contaminated soils. The citric acid-enhanced Fenton treatment resulted in the degradation of bound PAH residues that followed pseudo-first-order kinetics, with rate constants within 4.22 × 10−2, 1.25 × 10−1 and 2.72 × 10−1 h−1 for NAP, FLU, and ANT, respectively. The reactivity of bound PAH residues showed a correlation with their ionization potential (IP) values. Moreover, the degradation rate of bound PAH residues was significantly correlated with H2O2-Fe2+ ratio (m/m) and H2O2 concentrations. The highest removal efficiencies of bound PAH residues was up to 89.5% with the treatment of chelating agent oxalic acid, which was demonstrated to be superior to other acids, such as citric acid and hydrochloric acid. This study provides valuable insight into the feasibility of citric acid-Fenton and oxalic acid-Fenton treatments in rehabilitating bound PAH residues in contaminated soils.

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Section: Introductionmentioning

confidence: 99%

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

et al. 2019

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“…The isolated culture produced phytase and alkaline phosphatase that decomposed phytic acid to phosphate and increased the pH, which led to formation of Cu 3 (OH) 3 PO 4 crystals. Lu, Hong, et al (2019) reported that Fe(II)-bearing minerals (pyrite, mackinawite, wustite, and magnetite) could be electron donors to support Cr(VI) bio-reduction. Among them, mackinawite (FeS) was the best.…”

Section: Annual Literature Reviewmentioning

confidence: 99%

“…Li and Lu, Hong, et al (2019) studied the treatment of biologically pretreated coal chemical industrial wastewater using wet microwave‐assisted catalytic H 2 O 2 oxidation process (MWCWHPO) over activated carbon supported Cu‐Ni bimetallic catalysts, prepared by impregnation and precipitation method. The results revealed that catalysts prepared by precipitation method were smaller in size and greater in surface area, which exhibited stronger oxygen chemical adsorption characteristics and higher removal efficiency of quinoline and TOC compared to those prepared by the impregnation method.…”

Section: Chemical Treatmentmentioning

confidence: 99%

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Hazardous wastes treatment technologies

Shih

et al. 2020

Water Environment Research

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“…Rhizodegradation may be very effective in PAHs removal with well-established and potential PAHs degrading bacteria through growth linked and co-metabolic reactions(Kanaly and Haryama, 2010). Previous researchers had found well defined microbial combinations were more effective than pure cultures or single bacterial strains in PAHs degradation(Lu et al, 2019, Silva et al, 2009. The enhanced PAHs degradation with combination of bacterial strains is possible due to broader enzymatic capacity of bacterial populations and other vital relations among the microbial communities(Kuiper et al, 2004).…”

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Rhizodegradation of Phenanthrene, Anthracene and Pyrene by Augmenting Bacillus Cereus and Bacillus Subtilis Strains

Rao¹,

Yerra²,

Satyaprasad³

2021

IJAR

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Rhizodegradation is one of the best methods for the effective removal of dangerous polycyclic aromatic hydrocarbons pollutants from soil. This is operative due to the high persistent, non-bioavailability nature of PAHs and combined, sequential reactions of bacteria present in rhizosphere of plants. We have conducted pot-culture method to study the degradation of three PAHs compounds namely phenanthrene, anthracene and pyrene in artificially contaminated soils of rhizosphere and non-rhizosphere soil treatments of blackgram(Vignamungo L.) that augmented by two potential PAHs degraders namely Bacillus cereus CPOU13 and Bacillus subtilis SPC14 isolated from naturally contaminated soils for 90days. HPLC studies revealed that degradation percentages of the three PAHs in treatments were more where selected strains augmented to the soil treatments over the non-augmented soils. The rhizosphere treatments that have augmented strains recorded more degradation percentages of phenanthrene, anthracene and pyrene over the rhizosphere treatments that were non-augmented. Pyrene, a high molecular weight PAHs degraded maximum to 96.24% in rhizosphere soil treatment that is augmented with the strains while moderate degradation of pyrene recorded in non-autoclaved soil treatments that contain natural microbial communities. The study of counting of bacterial populations during the experimental period revealed that the populations of the selected and other natural bacteria were gradually increased from the first day, reached maximum by 60days and became almost consistent in 90days in all the treatments. It was also observed that the populations of bacteria were high in rhizosphere treatments compared to the non-rhizosphere soil treatments. With these results it has been predicted that degradation of PAHs in rhizosphere soil treatments is closely associated with the increasing PAHs degrading bacterial populations of selected bacterial strains that may consume more quantity of PAHs for their metabolic activities in rhizosphere soils. Key words: Rhizodegradation, PAHs, HPLC, pot culture.

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A PAH-degrading bacterial community enriched with contaminated agricultural soil and its utility for microbial bioremediation

Cited by 200 publications

References 47 publications

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

Hazardous wastes treatment technologies

Rhizodegradation of Phenanthrene, Anthracene and Pyrene by Augmenting Bacillus Cereus and Bacillus Subtilis Strains

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