Influence of hydraulic gradient and temperature on the migration of E. coli in saturated porous media during bank filtration: a case study at the Second Songhua River, Songyuan, Northeastern China

Ren, Wanli; Su, Xiaosi; Zhang, Xue; Chen, Yaoxuan; Shi, Yawei

doi:10.1007/s10653-019-00459-4

Cited by 17 publications

(5 citation statements)

References 33 publications

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“…The concentration of fecal indicator bacteria (FIB) is routinely used to report the bacterial pollution in the water environment. This study showed that the total bacteria, E. coli, and Enterococcus were significantly lower in the Ili River than in other rivers with frequent human activities, such as the Haihe and the Songhua rivers (Lee et al, 2013;Ren et al, 2020;. It can be attributed to relatively low population density along the Ili River (Ili Kazakh Autonomous Prefecture 10 people/km 2 , Haihe River Basin 384 people/km 2 ), which emphasizes that bacterial pollution in rivers is potentially affected by human activities.…”

Section: Discussionmentioning

confidence: 79%

The Occurrence and Distribution Pattern of Antibiotic Resistance Genes and Bacterial Community in the Ili River

Yang

et al. 2022

Front. Environ. Sci.

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The emergence of antibiotic resistance genes (ARGs) is a great risk to the ecosystem and human health; however, there are rare systematic studies about the characterization and source identification of ARGs in continental rivers. This study examined the occurrence of bacterial communities and ARGs in the water and soil of the Ili River using bacterial testing and metagenomic sequencing. Total dissolved solids (TDSs) and total bacterial count significantly increased from upstream to downstream sites. Enterococcus showed the highest abundance in Cockdara. Metagenomic sequencing revealed that the bacterial communities of surface water were different from those of nearshore soils. Among the top 10 ARGs, fluoroquinolone and aminoglycoside resistance genes exhibited dominant relative abundance, but only the multidrug resistance gene adeF was common in all water and soil samples. Proteobacteria carried almost 61% of ARGs, suggesting that these could be the main antibiotic-resistant bacteria (ARB) in the Ili River. Proteobacteria and ARB were mainly distributed in Yining city and Cockdara. Furthermore, the distribution pattern among the five sampling sites indicated that human activity and animal husbandry greatly contributed to the ARB and ARG contamination. This study first investigated the occurrence and distribution pattern of ARGs in the Ili River, demonstrating a clear correlation between bacteria and ARGs, and ARGs and mobile genetic elements (MGEs).

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Section: Discussionmentioning

confidence: 79%

The Occurrence and Distribution Pattern of Antibiotic Resistance Genes and Bacterial Community in the Ili River

Yang

et al. 2022

Front. Environ. Sci.

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“…During the initial stages of segmentation, microorganisms are concentrated on the surface and have not yet penetrated the food's interior. However, further refinement of some cooled pork is necessary for production and consumer demand, leading to structural degradation and contamination of the inner layer [15]. Nevertheless, the overall number of microorganisms in the segmented cooled pork's interior is minimal or even sterile.…”

Section: Discussionmentioning

confidence: 99%

“…Pseudomonas is aerobic and proliferates at a relatively slow rate, while Pseudomonas aeruginosa is aerobic or facultative anaerobic with certain penetration abilities. Yeast/mold have slow reproduction rates but survive in hypoxic environments and have some penetration ability [16].…”

Section: Discussionmentioning

confidence: 99%

Study on the permeability of dominant microorganisms in chilled pork under different temperature conditions

Zhang¹,

Huang

Luo³

et al. 2023

Preprint

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Chilled meat has a high water activity and is rich in nutrients, so it is prone to microbial contamination during industrial production, and the microorganisms contaminated are widespread and complex. In order to address its biosafety issues and potential food safety risks, the experiment was conducted to investigate the variation of dominant spoilage bacteria in chilled meat under storage conditions of 2 ± 2 ℃, 10 ± 2 ℃, and 20 ± 2 ℃, respectively. At the same time, the variation of spoilage bacteria in four layers of chilled meat under three temperature conditions was detected. The results showed that when chilled pork was stored at 2 ± 2 ℃ and 10 ± 2 ℃, Pseudomonas sp., Thermosporaceae, and Enterobacteriaceae were the dominant spoilage bacteria in chilled pork, while when stored at 20 ± 2 ℃, Thermosporaceae, Enterobacteriaceae, Pseudomonas sp., and Lactobacillus sp. became the dominant spoilage bacteria in chilled pork; When chilled pork was stored at 2 ± 2 ℃ and 10 ± 2 ℃, the order of proliferation of different types of spoilage microorganisms in the inner layer was as follows: Fusarium thermophila>Enterobacteriaceae>Lactobacillus>Pseudomonas>Yeast/Yeast>Staphylococcus/ Micrococcus; When stored at 20 ± 2 ℃, the order of the number of proliferation of different types of spoilage microorganisms is as follows: Thermomycetes>Enterobacteriaceae>Lactobacillus >Yeast/Yeast>Pseudomonas>Staphylococcus/Micrococcus. Finally, through the change rules of dominant spoilage bacteria under three temperatures and the penetration of spoilage bacteria in chilled meat, it provides a theoretical basis for enterprises to improve precision sterilization and key control point technology.

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“…This is because higher temperatures promote E. coli growth and activity. Additionally, the melting of snow and ice in spring can result in a sudden increase in stream ow, which may transport E. coli from the catchment areas to downstream water bodies (Ren et al, 2020). The effects of seasonal hydrological regimes on E. coli exports vary both spatially and temporally.…”

Section: Spatiotemporal Variations Of E Coli In the Jrwmentioning

confidence: 99%

Coupled effects of land-use patterns and hydrological regimes on fecal indicator bacteria in a coastal watershed

Huang,

Wang,

Xie

et al. 2023

Preprint

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Monitoring and assessing fecal indicator bacteria (FIB) can inform aquatic ecosystem health and management. However, knowledge of the patterns of fecal coliforms and the underlying mechanisms in rivers is still limited. In this study, we aimed to investigate the coupled effects of land-use patterns and hydrological regimes on FIB patterns in a subtropical coastal watershed, the Jiulong River Watershed (JRW). Water samples were collected quarterly for nutrient and FIB measurements across the watershed, from October 2020 to July 2021. The results indicate that Escherichia coli and Fecal E. coli concentrations peaked in summer and autumn, with significantly higher concentrations observed in urban watersheds than in natural watersheds. Redundancy analysis further revealed that of the four sampling seasons, the relative contribution of land use to FIB characteristics in the JRW was the highest in autumn, whereas that of water quality was the highest in the other three seasons. Water flow showed the lowest relative contribution in all the seasons and a positive correlation between high nutrient concentrations and E. coli counts exhibited. This study enhances our understanding on the coupled effects of seasonal hydrological regimes and land-use patterns on FIB characteristics, which might provide implications for mitigating the risk of E. coli contamination in similar human-impacted watersheds.

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Influence of hydraulic gradient and temperature on the migration of E. coli in saturated porous media during bank filtration: a case study at the Second Songhua River, Songyuan, Northeastern China

Cited by 17 publications

References 33 publications

The Occurrence and Distribution Pattern of Antibiotic Resistance Genes and Bacterial Community in the Ili River

The Occurrence and Distribution Pattern of Antibiotic Resistance Genes and Bacterial Community in the Ili River

Study on the permeability of dominant microorganisms in chilled pork under different temperature conditions

Coupled effects of land-use patterns and hydrological regimes on fecal indicator bacteria in a coastal watershed

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