Exogenous refractory protein enhances biofilm formation by altering the quorum sensing system: A potential hazard of soluble microbial proteins from WWTP effluent

Cui, Xiaochun; Chen, Congli; Liu, Yinglu; Zhou, Dandan; Liu, Mengyuan

doi:10.1016/j.scitotenv.2019.02.370

Cited by 14 publications

(4 citation statements)

References 31 publications

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“…In fact, clogging has a positive effect on the As shown in Figure 12, 3DEEM spectra of four different times were selected for comparison. A high-concentration soluble microbial byproduct was included in reclaimed water, which indicated that most substances were biomass-associated products resulting from cell lysis and hydrolysis [34]. Figure 10 shows that some amino acids, proteins and soluble microbial byproduct-like materials in the effluent decreased regularly, while the fulvic acid-and humic acid-like organics increased with time.…”

Section: Variation Of Organic Indicatorsmentioning

confidence: 99%

“…Some research has shown that DOM was mainly retained on the surface of soils, and DOM concentrations exhibited an exponential decline throughout the unsaturated vadose zone, in which biodegradation was considered to be the main removal mechanism [32,33]. Moreover, the soluble microbial products (SMPs) in the effluent were always ignored, which mainly comprised protein, polysaccharide and humic acids, and it has been reported that protein can promote the growth of microbial biofilm, even causing a risk of biological clogging [34]. Therefore, it is necessary to understand the migration and deposition process of SMPs during physical clogging.…”

Section: Introductionmentioning

confidence: 99%

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Physical Clogging Characteristics and Water Quality Variations by Injecting Secondary Effluent into Porous Media: A Laboratory Column Study

Wang

Zhang

et al. 2022

Water

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Artificial recharge engineering has been widely used to solve the water resource crisis. However, there are still some safety hazards regarding reclaimed water quality. Here, chlorinated secondary effluent (SE) was injected into saturated porous media composed of high–purity quartz sands. The column experiment was conducted and modeled through a developed numerical model to predict the evolution of physical clogging. Some representative inorganic and organic indicators were measured both at different times and in different column sections. The study showed that the relative hydraulic conductivity (K/K0) decreased significantly by approximately 63.5% in 40 h. Especially for the first 3 cm of the column, the clogging was the most serious, with a decrease of approximately 85.8%. The porous media has a certain degree of filtration effect on turbidity, TOC, protein (Pr) and polysaccharide (PS) but has slight removal for other water quality indicators. Pr is the main component of the intercepted TOC, and its content is higher than that of Ps. Moreover, the inorganic and organic parameter variations along the column further verified that the organic floc particles were mainly retained in the first 3 cm. The 3D excitation/emission matrix (3DEEM) fluorescence spectra illustrated that the humic acids and fulvic acids were easy to release and that their injection may be harmful to groundwater quality. The study will lay a theoretical foundation and provide a guiding scheme for optimizing China’s reclaimed water reuse technology, ensuring the safety of reclaimed water quality.

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Section: Variation Of Organic Indicatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical Clogging Characteristics and Water Quality Variations by Injecting Secondary Effluent into Porous Media: A Laboratory Column Study

Wang

Zhang

et al. 2022

Water

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“…They are a key factor in the stabilization of the EPS structure [22], which was dominant within the bottom biofilm layer, thus accelerating bacteria attachment. The bacterial cells responded to the exogenous stimulation, thus secreting more proteins and polysaccharides in order to resist cell damage from aluminum [23]. EPS was further evaluated utilizing the 3D-EEM fluorescence spectra (Figure 3).…”

Section: Al Distribution and Changes In Eps Fractionsmentioning

confidence: 99%

The Influence of Residual Coagulant Al on the Biofilm EPS and Membrane Fouling Potential in Wastewater Reclamation

Sun

Zhao

Cui

et al. 2020

Water

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Biofouling is inevitable in wastewater reclamation when using membrane technology. In particular, the extracellular polymeric substances (EPS) from biofilm is a major contributor to biofouling. Coagulation is critical in the process of reusing wastewater before membrane treatment, and residual coagulants (e.g., Al salts) are able to alter the characteristics of the biofilm EPS. However, the distribution of residual Al across varying biofilm EPS fractions and its effect on the membrane fouling potential resulting from biofilm EPS remains unclear. We found that 34% of the residual Al was present in the soluble EPS (S-EPS), 26% in the loosely bound EPS (LB-EPS) and 40% in the tightly bound EPS (TB-EPS). Moreover, compared with the control groups, the residual Al in biofilm induced more biofilm formation and more EPS formation. Al reduced the zeta potential and increased the hydrophobicity of the EPS. These changes induced a significant rise in the membrane fouling potential of S-EPS and LB-EPS. This work provides coagulation support for wastewater reclamation using membrane technology.

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“…In the biological treatment process, soluble microbial products (SMPs) were released by microbial degradation of organic matters through cell lysis, cell membrane diffusion, and anabolic loss accompanied (Kang et al 2014). Some relevant literature con rmed that humic substances, proteins, and carbohydrates were the dominant components of SMPs (Shen et al 2012;Cui et al 2019). Dissolved organic nitrogen (DON) derived from SMPs was composed of a series of compounds containing nitrogencontaining functional groups, mainly including NHs, aminos, nitriles, purines, pyrimidines, nitro compounds, etc.…”

Section: Introductionmentioning

confidence: 99%

Spectral characterization of the effect of gas–water ratio on dissolved organic nitrogen variation along a drinking water biological aerated filter

Kang

Song

Liu

et al. 2021

Environ Sci Pollut Res

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In order to improve our understanding of dissolved organic nitrogen (DON) variation characteristics in the biological aerated lter (BAF) for drinking water treatment, this study focused on gas-water ratio, a controlling factor of BAF operation, to study spectral characteristics of DON under different gas-water ratio conditions (0, 0.5:1, 2:1 and 10:1). The variations of dissolved organic carbon (DOC) and DON concentrations showed that DOC removal e ciency was consistent with DON concentration, both of which increased with the increase of gas-water ratio, but the increase gradually reduced and was certain limited. Three-dimensional excitation-emission matrix (3D-EEM) spectroscopy combined with parallel factor (PARAFAC) model and uorescence regional integration (FRI) technique were applied to analyze the effect of gas-water ratio on spectral characteristics of DON, PARAFAC analysis results identi ed the main component of DON were tryptophan and protein related substances. The resistances of various uorescent substances in the FRI technique under the in uence of gas-water ratio were shown as: protein substances > humic acid and fulvic acid substances ≈ SMPs-like substances. Correlation analysis showed that the variation of FIS from PARAFAC model was consistent with corresponding normalized integration volume in FRI analysis under different gas-water ratios.

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Exogenous refractory protein enhances biofilm formation by altering the quorum sensing system: A potential hazard of soluble microbial proteins from WWTP effluent

Cited by 14 publications

References 31 publications

Physical Clogging Characteristics and Water Quality Variations by Injecting Secondary Effluent into Porous Media: A Laboratory Column Study

Physical Clogging Characteristics and Water Quality Variations by Injecting Secondary Effluent into Porous Media: A Laboratory Column Study

The Influence of Residual Coagulant Al on the Biofilm EPS and Membrane Fouling Potential in Wastewater Reclamation

Spectral characterization of the effect of gas–water ratio on dissolved organic nitrogen variation along a drinking water biological aerated filter

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