Characteristics of extracellular polymeric substances (EPS) fractions from excess sludges and their effects on bioflocculability

Yu, Guanghui; He, Pinjing; Shao, Liming

doi:10.1016/j.biortech.2009.02.009

Cited by 237 publications

(75 citation statements)

References 24 publications

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“…Therefore, the floc structure can be more compact and could further improve the settling properties and the dewatering properties of sludge flocs (Agridiotis et al, 2007;Park et al, 2010). A conclusion that TB-EPS is the main complexation agent could be gained due to the greater complexation ability and greater amount of TB-EPS than LB-EPS, which could explain the phenomenon of the higher ratio of Al 3+ in the TB-EPS fraction compared to other fractions in activated sludge mentioned in the literature (Yu et al, 2009). …”

Section: Binding Mechanism Eps-al 3+mentioning

confidence: 97%

“…The LB-EPS and TB-EPS were extracted following previous research (Yu et al, 2009), with minor modification. Briefly, the original sludge was washed with Milli-Q water and then centrifuged at 4000 ×g for 5 min.…”

Section: Extraction Of Eps and Determination Of Eps Componentsmentioning

confidence: 99%

“…It has been reported that the content of Al 3+ in the TB-EPS fraction has a higher ratio compared to other fractions in activated sludge. The concentration of Al 3+ in TB-EPS and LB-EPS is 4.99 and 0.03 mg/L respectively, and the quantity of Al 3+ in the TB-EPS accounts for 97.5% of the total content of Al 3+ in activated sludge (Yu et al, 2009). However, till now the binding properties and the binding mechanism of Al 3+ and EPS have remained unclear because of the complexity of EPS.…”

Section: Introductionmentioning

confidence: 99%

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Flocculating characteristic of activated sludge flocs: Interaction between Al3+ and extracellular polymeric substances

Ruan

Liu

2013

Journal of Environmental Sciences

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Aluminum flocculant can enhance the flocculating performance of activated sludge. However, the binding mechanism of aluminum ion (Al 3+ ) and extracellular polymeric substances (EPS) in activated sludge is unclear due to the complexity of EPS. In this work, threedimensional excitation emission matrix fluorescence spectroscopy (3DEEM), fluorescence quenching titration and Fourier transform infrared spectroscopy (FT-IR) were used to explore the binding behavior and mechanism between Al 3+ and EPS. The results showed that two fluorescence peaks of tyrosine-and tryptophan-like substances were identified in the loosely bound-extracellular polymeric substances (LB-EPS), and three peaks of tyrosine-, tryptophan-and humic-like substances were identified in the tightly boundextracellular polymeric substances (TB-EPS). It was found that these fluorescence peaks could be quenched with Al 3+ at the dosage of 3.0 mg/L, which demonstrated that strong interactions took place between the EPS and Al 3+ . The conditional stability constants for Al 3+ and EPS were determined by the Stern-Volmer equation. As to the binding mechanism, the -OH, N-H, C=O, C-N groups and the sulfur-and phosphorus-containing groups showed complexation action, although the groups in the LB-EPS and TB-EPS showed different behavior. The TB-EPS have stronger binding ability to Al 3+ than the LB-EPS, and TB-EPS play an important role in the interaction with Al 3+ .

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Section: Binding Mechanism Eps-al 3+mentioning

confidence: 97%

Section: Extraction Of Eps and Determination Of Eps Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flocculating characteristic of activated sludge flocs: Interaction between Al3+ and extracellular polymeric substances

Ruan

Liu

2013

Journal of Environmental Sciences

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“…According to their spatial distribution, EPS can be subdivided into soluble EPS (weakly bound with cells or dissolved into the solution) and bound EPS (closely bound with cells) (Nielsen et al 1999;Barranguet et al 2004;Sheng et al 2010). Furthermore, bound EPS have been shown to be a dynamic double-layered EPS structure that includes loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) (Poxon and Darby 1997;Yu et al 2009;Chen et al 2013).…”

Section: Definition Characteristics and Spatial Distribution Of Epsmentioning

confidence: 99%

Detection Techniques for Extracellular Polymeric Substances in Biofilms: A Review

Pan

Zhu

Chen

et al. 2016

BioRes

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Extracellular polymeric substances (EPS) are one of the main components of biofilm, prompting biofilm to form a cohesive three-dimensional framework. Numerous methods are available to help characterize the properties and the structural, chemical and physical organizations of EPS during the biofilm formation process. This review highlights key techniques from different disciplines that have been successfully applied in-situ and non-destructively to describe the complex composition and distribution of EPS in biofilm, especially microscopic, spectroscopic, and the combination of multi-disciplinary methods that can provide new insights into the complex structure/function correlations in biofilms. Among them, confocal laser scanning microscopy (CLSM) is emphasized, and its principles, applications, advantages, and limitations are summarized. Multidisciplinary techniques have been developed and recommended to study EPS during the biofilm formation process, providing more in-depth insights into the composition and spatial distributions of EPS, so as to improve our understanding of the role EPS plays in biofilms ultimately.

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“…The EPS treatment had a significant influence on clogging matter size because it is able to attach to both abiotic and biotic accumulations in substrate (Flemming and Wingende, 2010). This may lead to the aggregation of particles through bridging action and sweep flocculation (Yu et al, 2009). The solubilization treatment was able to loosen the attachment between particles, and deflocculate the EPS colloid, so as to increase the release of EPS and make a portion brittle.…”

Section: Performance Evaluation Of the Solubilization Experiments Withmentioning

confidence: 99%

EPS solubilization treatment by applying the biosurfactant rhamnolipid to reduce clogging in constructed wetlands

Trinh

et al. 2016

Bioresource Technology

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Characteristics of extracellular polymeric substances (EPS) fractions from excess sludges and their effects on bioflocculability

Cited by 237 publications

References 24 publications

Flocculating characteristic of activated sludge flocs: Interaction between Al3+ and extracellular polymeric substances

Flocculating characteristic of activated sludge flocs: Interaction between Al3+ and extracellular polymeric substances

Detection Techniques for Extracellular Polymeric Substances in Biofilms: A Review

EPS solubilization treatment by applying the biosurfactant rhamnolipid to reduce clogging in constructed wetlands

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