Effects of microplastic sorption on microbial degradation of halogenated polycyclic aromatic hydrocarbons in water

Sun, Qing; Ren, Shu-Yan; Ni, Hong-Gang

doi:10.1016/j.envpol.2022.120238

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…In the first three days, the growth of microorganisms usually has a lag time for the microbial OD value, during which the OD value basically decreases rather than increases. The reason for this phenomenon is that cell proliferation is required to synthesize various substances and undergo a process of adjustment and adaptation [ 28 ]. Within 4–5 days of culture, the microorganisms showed signs of growth around the polymer particles and began to attach to the polymer particles.…”

Section: Resultsmentioning

confidence: 99%

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Biodeterioration of Microplastics by Bacteria Isolated from Mangrove Sediment

Ren

2023

Toxics

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As a kind of ubiquitous emerging pollutant, microplastics (MPs) are persistent in the environment and have a large impact on the ecosystem. Fortunately, some microorganisms in the natural environment can degrade these persistent MPs without creating secondary pollution. In this study, 11 different MPs were selected as carbon sources to screen the microorganisms for degradable MPs and explore the possible mechanism of degradation. After repeated domestication, a relatively stable microbial community was obtained after approximately 30 days later. At this time, the biomass of the medium ranged from 88 to 699 mg/L. The growth of bacteria with different MPs ranged from 0.030 to 0.090 optical density (OD) 600 of the first generation to 0.009–0.081 OD 600 of the third generation. The weight loss method was used to determine the biodegradation ratios of different MPs. The mass losses of polyhydroxybutyrate (PHB), polyethylene (PE), and polyhydroxyalkanoate (PHA) were relatively large, at 13.4%, 13.0%, and 12.7%, respectively; these figures for polyvinyl chloride (PVC) and polystyrene (PS) were relatively slight, 8.90% and 9.10%, respectively. The degradation half-life (t1/2) of 11 kinds of MPs ranges from 67 to 116 days. Among the mixed strains, Pseudomonas sp., Pandoraea sp., and Dyella sp. grew well. The possible degradation mechanism is that such microbial aggregates can adhere to the surface of MPs and form complex biofilms, secrete extracellular and intracellular enzymes, etc., break the hydrolyzable chemical bonds or ends of molecular chains by attacking the plastic molecular chains, and produce monomers, dimers, and other oligomers, leading to the reduction of the molecular weight of the plastic itself.

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Section: Resultsmentioning

confidence: 99%

“…The biomass (mg/L) was recorded as b, and the absorption coefficient was recorded as x. Then, the biomass of the microorganisms in the bacterial suspension was estimated by Equation (1) according to the OD value [ 28 ]: ln b = −1.05 ln x + 4.26 …”

Section: Methodsmentioning

confidence: 99%

Biodeterioration of Microplastics by Bacteria Isolated from Mangrove Sediment

Ren

2023

Toxics

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“…Previous research has indicated that Hyphomicrobium harbors dehalogenase enzymes capable of degrading various halogenated compounds. For instance, Sun et al [41] identified a…”

Section: Plos Onementioning

confidence: 99%

Investigating the degradation potential of microbial consortia for perfluorooctane sulfonate through a functional "top-down" screening approach

Liang,

2024

PLoS ONE

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Perfluorooctane sulfonate (PFOS) is a prominent perfluorinated compound commonly found in the environment, known to pose various risks to human health. However, the removal of PFOS presents significant challenges, primarily due to the limited discovery of bacteria capable of effectively degrading PFOS. Moreover, single degradation bacteria often encounter obstacles in individual cultivation and the breakdown of complex pollutants. In contrast, microbial consortia have shown promise in pollutant degradation. This study employed a continuous enrichment method, combined with multiple co-metabolic substrates, to investigate a microbial consortium with the potential for PFOS degradation. By employing this methodology, we effectively identified a microbial consortium that demonstrated the capacity to reduce PFOS when exposed to an optimal concentration of methanol. The consortium predominantly comprised of Hyphomicrobium species (46.7%) along with unclassified microorganisms (53.0%). Over a duration of 20 days, the PFOS concentration exhibited a notable decrease of 56.7% in comparison to the initial level, while considering the exclusion of adsorption effects. Furthermore, by comparing the predicted metabolic pathways of the microbial consortium with the genome of a known chloromethane-degrading bacterium, Hyphomicrobium sp. MC1, using the KEGG database, we observed distinct variations in the metabolic pathways, suggesting the potential role of the unclassified microorganisms. These findings underscore the potential effectiveness of a "top-down" functional microbial screening approach in the degradation of stubborn pollutants.

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“…MPs act as organic compounds carriers or adsorbents; they can accumulate dangerous chemicals present in small quantities in drinking water, such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and organochlorine pesticides [252,263].…”

Section: Microplastic (Mp) Fate In Dwdsmentioning

confidence: 99%

The Behavior of Polymeric Pipes in Drinking Water Distribution System—Comparison with Other Pipe Materials

Stefan,

Bosomoiu,

Teodorescu

2023

Polymers

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The inner walls of the drinking water distribution system (DWDS) are expected to be clean to ensure a safe quality of drinking water. Complex physical, chemical, and biological processes take place when water comes into contact with the pipe surface. This paper describes the impact of leaching different compounds from the water supply pipes into drinking water and subsequent risks. Among these compounds, there are heavy metals. It is necessary to prevent these metals from getting into the DWDS. Those compounds are susceptible to impacting the quality of the water delivered to the population either by leaching dangerous chemicals into water or by enhancing the development of microorganism growth on the pipe surface. The corrosion process of different pipe materials, scale formation mechanisms, and the impact of bacteria formed in corrosion layers are discussed. Water treatment processes and the pipe materials also affect the water composition. Pipe materials act differently in the flowing and stagnation conditions. Moreover, they age differently (e.g., metal-based pipes are subjected to corrosion while polymer-based pipes have a decreased mechanical resistance) and are susceptible to enhanced bacterial film formation. Water distribution pipes are a dynamic environment, therefore, the models that are used must consider the changes that occur over time. Mathematical modeling of the leaching process is complex and includes the description of corrosion development over time, correlated with a model for the biofilm formation and the disinfectants–corrosion products and disinfectants–biofilm interactions. The models used for these processes range from simple longitudinal dispersion models to Monte Carlo simulations and 3D modeling. This review helps to clarify what are the possible sources of compounds responsible for drinking water quality degradation. Additionally, it gives guidance on the measures that are needed to maintain stable and safe drinking water quality.

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Effects of microplastic sorption on microbial degradation of halogenated polycyclic aromatic hydrocarbons in water

Cited by 9 publications

References 36 publications

Biodeterioration of Microplastics by Bacteria Isolated from Mangrove Sediment

Biodeterioration of Microplastics by Bacteria Isolated from Mangrove Sediment

Investigating the degradation potential of microbial consortia for perfluorooctane sulfonate through a functional "top-down" screening approach

The Behavior of Polymeric Pipes in Drinking Water Distribution System—Comparison with Other Pipe Materials

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