Review on the contamination and remediation of polycyclic aromatic hydrocarbons (PAHs) in coastal soil and sediments

Dai, Chaomeng; Han, Yueming; Duan, Yanping; Lai, Xiaoying; Fu, Rongbing; Liu, Shuguang; Leong, Kok Hoong; Tu, Yao-Jen; Zhou, Lang

doi:10.1016/j.envres.2021.112423

Cited by 129 publications

(35 citation statements)

References 123 publications

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“…Soils with lower salinities support a more diverse and robust microbial population, promoting collaboration between various bacteria, and ultimately leading to enhanced PAH reduction (Li et al, 2022). Due to their resistance and carcinogenicity to humans, High molecular weight (HMW) PAHs with 4-7 rings are substantially more dangerous than the low molecular weight (LMW) PAHs, which have 2-3 aromatic rings (Dai et al, 2022). Our study noticed that the pyrene (a 4-ringed PAH) is present at a high concentration and followed by PHE (a 2-ringed PAH) in the soil sample, isolating a more potent PAH degrader is essential to eliminate the pollutants at the contaminated site.…”

Section: Discussionmentioning

confidence: 99%

Molecular characterization of a polycyclic aromatic hydrocarbons (PAHs) degrader, Burkholderia contaminans strain P14, isolated from aged oil-contaminated soil in Kuwait

Akbar

Rahmeh

Kishk

et al. 2022

Appl Env Biotechnol

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Soil contamination by polycyclic aromatic hydrocarbons (PAHs) and heavy metals is a major concern affecting soil quality. Bioremediation is an efficient approach to decontaminate these pollutants while posing the lowest risk to the environment. This technique is based on identifying microorganisms with the metabolic potential to degrade the pollutants. In this study, the physiochemical properties of oil-contaminated soils in Kuwait were investigated. The soil had alkaline pH (8.36) with a salinity of 0.08% and PAHs compounds were detected at high concentrations (pyrene, 1212 mg/kg), (phenanthrene, 710 mg/kg) and (fluorene 326 mg/kg). Heavy metals such as iron, aluminum, sodium, magnesium, vanadium, copper, etc., were also detected in the soil samples. Then, selective screening for PAH degraders was performed and assessed by colony forming units (CFU) and 16S rDNA gene sequences to determine their growth profiles and taxonomical identification. In total, 21 strains were selected for their resistance to PAHs, which include Pseudomonas (9), Burkholderia (6), Bacillus (2), Bordetella (1), Microbacterium (1), Micrococcus (1), and Kocuria (1). Among all, the growth by Burkholderia sp. P14, in the presence of phenanthrene and fluorene, has maintained a stationary phase from day 5 to 8 with a 6 log CFU/ml bacterial count. The draft genome of the Burkholderia contaminans P14 strain comprised 68 contigs with 8,584,157bp, 66% GC content, 4 rRNA and 75 tRNA. A total of 80 genes were involved in the degradation of the benzoate, naphthalene, and PAH . Genes that encode the PAH degradation were clustered into four distinct groups, including pcaHG, pcaB, pcaIJ, and pcaKFR and were found to be in contigs 5, 11, 8 and 13 of B. contaminans P14, respectively. KEGG analysis suggested that PAHs were degraded in P14 via the protocatechuate and catechol branches of the β-ketoadipate protocatechuate degradation pathway. The genomic island regions in P14 differed from those in the reference genome of B. contaminans M14, indicating the novelty and genomic recombination of the strain. Genomic information on P14 has helped clarify the molecular mechanisms involved in PAH catabolism. Burkholderia contaminans P14 strain will enhance the bioremediation of oil-contaminated soils.

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Section: Discussionmentioning

confidence: 99%

Molecular characterization of a polycyclic aromatic hydrocarbons (PAHs) degrader, Burkholderia contaminans strain P14, isolated from aged oil-contaminated soil in Kuwait

Akbar

Rahmeh

Kishk

et al. 2022

Appl Env Biotechnol

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“…In spite of prohibitions, this problem has not been solved, as controls are quite difficult (Zhao et al 2020 ). Based on results from 100 sampling sites, polyaromatic hydrocarbon (PAH) pollution is strongest in China’s north and northwest, with an average of 900–1500 ng PAH/g soil (Zhang and Chen 2017 ), and also in coastal areas (Dai et al 2022 ). Next to PAH, heavy metal pollution is severe in many places.…”

Section: Soil and Wastementioning

confidence: 99%

China’s environmental solutions

Schmid

Xiong

2023

Appl Microbiol Biotechnol

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China emits unproportionately high concentrations of CO2 and, due to rapid population growth and industrialization, suffers from air, water, and soil pollution. However, many of these challenges for sustainable growth are being vigorously addressed, and China aims at a CO2 emission peak by 2030 and carbon neutrality by 2060 (“dual carbon policy”). In addition, nation-wide programs attempt to achieve reforestation and ecological restoration. By 2025, core elements of a “bioeconomy” and a circular economy are expected to be ready. Many of these programs extend into China’s international “belt-and-road” initiative (BRI). In this article, we briefly describe the present achievements of China’s environmental solutions and the country’s visions for a “digital, eco-friendly civilization.” Key points • China’s steps towards environmental cleaning, eco-protection, and decarbonization. • Steps towards a future bioeconomy.

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“…2 Especially, high-molecular-weight PAHs are recalcitrant and carcinogenic to human beings. 3 Due to the high hydrophobicity of PAHs, the soil is the most important terrestrial reservoir for them. 4 For example, the total concentrations of PAHs at Superfund sites in the United States could reach up to hundreds or thousands of mg kg −1 .…”

Section: Introductionmentioning

confidence: 99%

Roles of Natural Phenolic Compounds in Polycyclic Aromatic Hydrocarbons Abiotic Attenuation at Soil–Air Interfaces through Oxidative Coupling Reactions

Sun

Chu

Wang

et al. 2023

Environ. Sci. Technol.

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Little information is available on the roles of natural phenolic compounds in polycyclic aromatic hydrocarbons (PAHs) attenuation at dry soil–air interfaces. The purpose of this study was to determine the roles of model phenolic constituents of soil organic matter (SOM) on the abiotic attenuation of PAHs. The phenolic compounds can significantly change the attenuation rates of PAHs, among which hydroquinone was the most effective in promoting anthracene and benzo[a]anthracene attenuation. Product identification and sequential extraction experiments revealed hydroquinone enhanced the formation of oxidative coupling products and promoted the incorporation of PAHs into humic analogues, thereby reducing potential risks to humans and ecosystems. Electron paramagnetic resonance spectroscopy analyses showed both PAHs and phenolic compounds could donate electrons to Lewis acid sites of soil minerals, resulting in the generation of persistent free radicals (PFRs). PFRs could promote the generation of ·OH to enhance PAH oxidation and could cross-couple with PAHs, resulting in high-molecular-weight oxidative coupling products. This study revealed for the first time the reaction mechanism between PAHs and phenolic components of SOM under relatively dry conditions and provided new insights into promoting PAHs detoxification in soils but also a potential strategy to increase the organic carbon sequestration.

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Review on the contamination and remediation of polycyclic aromatic hydrocarbons (PAHs) in coastal soil and sediments

Cited by 129 publications

References 123 publications

Molecular characterization of a polycyclic aromatic hydrocarbons (PAHs) degrader, Burkholderia contaminans strain P14, isolated from aged oil-contaminated soil in Kuwait

Molecular characterization of a polycyclic aromatic hydrocarbons (PAHs) degrader, Burkholderia contaminans strain P14, isolated from aged oil-contaminated soil in Kuwait

China’s environmental solutions

Roles of Natural Phenolic Compounds in Polycyclic Aromatic Hydrocarbons Abiotic Attenuation at Soil–Air Interfaces through Oxidative Coupling Reactions

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