Functional evaluation of pollutant transformation in sediment from combined sewer system

Shi, Xuan; Ngo, Huu Hao; Sang, Lang-Tao; Jin, Pengkang; Wang, Xiaochang C.; Wang, Guanghua

doi:10.1016/j.envpol.2018.03.007

Cited by 40 publications

(15 citation statements)

References 41 publications

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“…The dominant phyla in the five reactors were Proteobacteria , Bacteroidetes, Euryarchaeota , and Firmicutes (Figure a), which was similar to previous studies. , Increased shear velocity significantly reduced the abundance of Proteobacteria in the shallow layer of the sediments, suggesting that more substrate from the sewage permeated into the sediment and changed the microbial community. At the genus level, the dominant genus in the shallow layer was Methanosaeta , whose relative abundance decreased with increasing sediment depth.…”

Section: Resultssupporting

confidence: 88%

“…In previous studies, Chen et al confirmed that an active biofilm layer is present at the sediment surface, and Liu et al demonstrated that sulfide generation occurs primarily in shallow regions of sediments. However, Shi et al . found that sulfate-reducing bacteria (SRB) exhibit depth-dependent reproductive characteristics due to the accumulation of dissolved organic matter and the variation in ORP along the sediment depth, which may result in the production of sulfide in deep zones of sediments.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Exploration of the Sulfidogenic Process at the Water-Sediment Interface in Sewers: Mechanism and Implications

et al. 2020

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Corrosion and odor induced by sulfidogenic processes is a worldwide issue in environmental engineering. This study focuses on a neglected, but critical process, sulfidogenic conversion at the water-sediment interface, to optimize the prediction and control of sulfide in sewers. A novel in situ, high-resolution measurement method based on the diffusive gradients in thin films technique was established for the first time for use in sewer systems. The results showed that, at a critical shear velocity (i.e., ∼0.07 m/s), the key factor dominating sulfidogenic activity in the surface layer of sediment (i.e., ∼1 cm) switched to substrate diffusion resistance at the water-sediment surface. An increase in shear velocity from 0 to ∼0.07 m/s significantly activated the sulfidogenic process in this layer. The spatial variation in the functional microbial community further confirmed the sediment profile of sulfidogenic activity. A sewer model incorporating the substrate diffusion process at the water-sediment interface was developed and verified, which revealed the characteristic response of the diffusive boundary layer thickness at the water-sediment interface to shear velocity. The maximum sulfide production rates (k H2S) under varying water quality and shear velocity conditions were successfully simulated, improving the model’s predictive accuracy in gravity sewers. This study has certain engineering significance for optimizing sulfide prediction and control in sewers.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

In Situ Exploration of the Sulfidogenic Process at the Water-Sediment Interface in Sewers: Mechanism and Implications

et al. 2020

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“…16S rRNA sequencing showed that Proteobacteria, Bacteroidetes, Chloroflexi, and Firmicutes were the main phyla in the samples. Proteobacteria and Bacteroidetes are ubiquitous in soils, wastewater, and sediments [25][26][27][28]. ese results are similar to those previously obtained for the composition of bacteria in bioelectrochemically assisted constructed wetlands for treating synthetic wastewater [29,30].…”

Section: Discussionsupporting

confidence: 87%

Improvement of Black-Odor Water by Pichia Strain GW1 under Optimized NH₃-N Degradation Conditions

Xie

Wang

Zeng

et al. 2020

BioMed Research International

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In this study, a yeast strain with an outstanding NH3-N degradation ability was isolated from the sediment of a black-odor water channel in Guangdong Province, China. Based on phenotypic and phylogenetic analysis, this strain was identified as Pichia kudriavzevii GW1. The optimum conditions for NH3-N degradation by the GW1 strain were as follows: 0.3% inoculum concentration, 1.5 L/min aeration, pH 7, and a temperature of 35°C. Under optimized conditions, the GW1 strain degraded 95.5% of the NH3-N. The strain was then added to simulated black-odor water under optimal degradation conditions to investigate changes to the bacterial community over time. 16S rRNA sequencing of samples collected on days 0, 7, 14, and 21 showed that, in the presence of the GW1 strain, the relative abundances of the phyla Proteobacteria, Bacteroidetes, Chloroflexi, and Firmicutes increased in the black-odor water. In addition, the relative abundance of Propionivibrio, a known NH3-N degrading genus, increased. This study will facilitate the use of microbiological methods to repair black-odor water.

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“…The concentrations of polysaccharides, proteins, and lipids in branch pipes were significantly higher than those in main pipes (for 112 mg/L, 42 mg/L, and 6 mg/L, respectively), indicating that these organic materials in sewage were degraded along the sewer. Previous studies showed that sediment was ubiquitous along the urban sewer and was contributed by the deposition of particulate matter from sewage [8, 17]. To determine the pollutant degradation in sediment, 10 meters of sediment was taken from the sewer.…”

Section: Resultsmentioning

confidence: 99%

Non-negligible greenhouse gases from urban sewer system

Jin

Shi

et al. 2019

Biotechnol Biofuels

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Background: The urban sewer system is an important component of urban water infrastructure for sewage collection and transportation, and in-sewer transportation of sewage can cause multitudinous contaminant degradations which lead to formation of gaseous products. Although the greenhouse gases of methane and carbon dioxide have been confirmed to consist in the gaseous products, the mechanisms of greenhouse gas generation were unclear and the significances of greenhouse gases emission from sewers were generally underestimated. Results: In this study, 3 years of monitoring was conducted to evaluate the greenhouse gases emission in 37-kmlong urban sewer systems covering 13 km 2. The results showed that the emission of carbon dioxide and methane was extensively existing in sewers, and especially, exhibited a characteristic of regional difference. In order to reveal the formation mechanism of carbon dioxide and methane in sewers, the metagenomic approach was utilized to analyze the annotated pathways and homologous bio-enzymes, and it indicated that fourteen pivotal annotated pathways were involved in the carbon dioxide and methane generation. According to the metagenomics and 3-year monitoring results, the total amounts of carbon dioxide and methane emission in sewers were calculated by the transformation venation of contaminants (such as methyl alcohol, methylamine and acetic acid along branch sewer, sub-main sewer and main sewer, respectively). The calculation results showed that the total greenhouse gas emissions in sewer were calculated to be 199 t/day in Xi'an, and if scaling up as population proportion, the greenhouse gas emission from sewer systems in China could be 30,685 t/day. Comparing with the greenhouse gas emissions from different metropolises (New York City, London and Tokyo) and industries (dairy farms, automobile production and steel enterprises), the amount of greenhouse gases produced by the urban sewer system is much higher. Conclusions: This study revealed the transformation pathways of contaminants which promoted the generation of greenhouse gases in sewers. Based on this analysis, the greenhouse gas emissions along sewer systems were calculated. The results indicate that the greenhouse gas emission from sewer systems is non-negligible, and should be attracted sufficient attention.

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Functional evaluation of pollutant transformation in sediment from combined sewer system

Cited by 40 publications

References 41 publications

In Situ Exploration of the Sulfidogenic Process at the Water-Sediment Interface in Sewers: Mechanism and Implications

In Situ Exploration of the Sulfidogenic Process at the Water-Sediment Interface in Sewers: Mechanism and Implications

Improvement of Black-Odor Water by Pichia Strain GW1 under Optimized NH₃-N Degradation Conditions

Non-negligible greenhouse gases from urban sewer system

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Functional evaluation of pollutant transformation in sediment from combined sewer system

Cited by 40 publications

References 41 publications

In Situ Exploration of the Sulfidogenic Process at the Water-Sediment Interface in Sewers: Mechanism and Implications

In Situ Exploration of the Sulfidogenic Process at the Water-Sediment Interface in Sewers: Mechanism and Implications

Improvement of Black-Odor Water by Pichia Strain GW1 under Optimized NH3-N Degradation Conditions

Non-negligible greenhouse gases from urban sewer system

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Improvement of Black-Odor Water by Pichia Strain GW1 under Optimized NH₃-N Degradation Conditions