Polymeric compounds in activated sludge supernatant — Characterisation and retention mechanisms at a full-scale municipal membrane bioreactor

Lyko, Sven; Al-Halbouni, Djamila; Wintgens, Thomas; Janot, Andreas; Hollender, Juliane; Dott, Wolfgang; Melin, Thomas

doi:10.1016/j.watres.2007.06.012

Cited by 111 publications

(40 citation statements)

References 24 publications

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“…In MW measurement, it should be noted that carbohydrates contain no conjugated double bond, so the detection of them was only possible if they were present as part of molecular complexes such as glycoproteins and glycolipids (Lyko et al, 2007). Lyko et al (2007) suggested that three main molar mass fractions can be distinguished: high MW organic compounds (>5000 Da) mainly composed of proteins and polysaccharides, mid-MW compounds (1000e5000 Da) and organic matter of low MW (<1000 Da).…”

Section: Molecular Weight Distribution Analysismentioning

confidence: 99%

“…Lyko et al (2007) suggested that three main molar mass fractions can be distinguished: high MW organic compounds (>5000 Da) mainly composed of proteins and polysaccharides, mid-MW compounds (1000e5000 Da) and organic matter of low MW (<1000 Da). Bhatia et al (2013) found that the MW of protein-like substances in EPS samples extracted from activated sludge was in a wide range of 1e600 kDa.…”

Section: Molecular Weight Distribution Analysismentioning

confidence: 99%

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Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

et al. 2016

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a b s t r a c tThe effects of combined calcium peroxide (CaO 2 ) oxidation with chemical re-flocculation on dewatering performance and physicochemical properties of waste activated sludge was investigated in this study. The evolutions of extracellular polymeric substances (EPS) distribution, composition and morphological properties were analyzed to unravel the sludge conditioning mechanism. It was found that sludge filtration performance was enhanced by calcium peroxide oxidation with the optimal dosage of 20 mg/ gTSS. However, this enhancement was not observed at lower dosages due to the absence of oxidation and the performance deteriorated at higher dosages because of the release of excess EPS, mainly as proteinlike substances. The variation in soluble EPS (SEPS) component can be fitted well with pseudo-zero-order kinetic model under CaO 2 treatment. At the same time, extractable EPS content (SEPS and loosely bound EPS (LB-EPS)) were dramatically increased, indicating sludge flocs were effectively broken and their structure became looser after CaO 2 addition. The sludge floc structure was reconstructed and sludge dewaterability was significantly enhanced using chemical re-flocculation (polyaluminium chloride (PACl), ferric iron (FeCl 3 ) and polyacrylamide (PAM)). The inorganic coagulants performed better in improving sludge filtration dewatering performance and reducing cake moisture content than organic polymer, since they could act as skeleton builders and decrease the sludge compressibility.

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Section: Molecular Weight Distribution Analysismentioning

confidence: 99%

Section: Molecular Weight Distribution Analysismentioning

confidence: 99%

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

et al. 2016

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“…4, five MW peaks in SEPS could be observed: 41 kDa, 2500 Da, 1900 Da, 900 Da and 780 Da. According to report of Lyko et al, EPS could be divided into three fractions: high MW organic compounds (>5000 Da)-protein and polysaccharide, mid-MW compounds (1000-5000 Da)-mainly composed by humic substances and organic matters of low MW (<1000)-building blocks [27]. No obvious variation in ME distribution of SEPS was observed at pH of 5-9.…”

Section: Impact Of Ph On Eps Properties With/without Ferrate Treatmenmentioning

confidence: 94%

“…Since the polysacchride contains no conjugated double bond, they only can be determined in the form of glycoprotein and glycolipid [27]. As depicted in Fig.…”

Section: Impact Of Ph On Eps Properties With/without Ferrate Treatmenmentioning

confidence: 99%

Variations in distribution and composition of extracellular polymeric substances (EPS) of biological sludge under potassium ferrate conditioning: Effects of pH and ferrate dosage

Zhang

Cao

Wang

et al. 2016

Biochemical Engineering Journal

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a b s t r a c tThe effect of pH on chemical conditioning with potassium ferrate (K 2 FeO 4 ) for improving sludge filtration dewatering performance has been studied. The variation of extracellular polymeric substances (EPS) in conditioning process was investigated in detail to unravel the reaction mechanism. The results indicated that sludge dewaterability was improved by decreasing solution pH in terms of filtration rate and cake solids content. At acid conditions, protonation of EPS resulted in reduction of negative charge and densification of sludge floc. Sludge conditioning efficiency was improved with decrease in pH. Ferrate can solubilize EPS through oxidation process and also remove a portion of soluble EPS (SEPS) by charge neutralization and interfacial adsorption of hydrolyzed ferric ions, consequently compressing EPS and decreasing total extractable EPS content. In addition, when pH and potassium ferrate were 3 and 0.1 g/gTSS, the sludge filtration dewatering rate and extent reached the maximum. Deterioration of sludge dewaterability was observed as the ferrate was overdosed (>0.2 g/gTSS). This could be attributed to the release of a large amount of bound EPS (BEPS) as a result of ferrate oxidation, consequently increasing the sludge filtration resistance.

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“…S4 (see in supporting information), eight MW peaks can be detected in SEPS fraction: 125Da, 400Da, 700Da, 1200Da, 3000 Da, 4000 Da, 25,000 Da and 45,000 Da. Lyko et al (2007) suggested that three main molar mass fractions can be distinguished: high MW organic compounds (>5000 Da) mainly composed of proteins and polysaccharides, mid-MW compounds (1000e5000 Da) composed of humic substances and organic matter of low MW (<1000 Da), composed of organic building blocks. Each intensity of MW peak significantly weakened after TSCs treatment, especially the high molecular weight peaks, which was confirmed by the absence of MW peak on 25,000 Da.…”

Section: Fig 4 Effects Of Tscs Dosages On Concentrations Of Differementioning

confidence: 99%

Improvement of wastewater sludge dewatering performance using titanium salt coagulants (TSCs) in combination with magnetic nano-particles: Significance of titanium speciation

et al. 2017

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a b s t r a c tIn this study, the effects of chemical conditioning using titanium salt coagulants (TSCs) of different hydrolysis speciation in combination with magnetic nano-particles on dewatering performance of waste activated sludge were evaluated by means of specific resistance to filtration (SRF) and capillary suction time (CST). The morphological and extracellular polymeric substances (EPS) properties under chemical conditioning were investigated in detail to understand the reaction mechanisms involved. The results showed that the TSC with basicity of 0.5 performed better in improving sludge dewatering performance than other TSCs. Sludge floc formed by TSC 0.5 treatment was characterized by larger floc size and higher floc strength than that conditioned by other TSCs. EPS compression and densification were the major mechanisms of sludge conditioning, and TSC 0.5 had better performance in compressing EPS structure. In addition, reduction of soluble EPS concentration, especially protein-like substances contributed to improvement of sludge filterability under conditioning. Furthermore, addition of Fe 2 O 3 nanoparticles could further improve dewatering performance and decrease compressibility of sludge system by acting as skeleton builders and enhancing floc strength. The sludge particles aggregation efficiency was effectively improved with addition of nano-Fe 2 O 3 . They also were able to bind with protein-like substance in EPS component, which might contribute to promotion of sludge filterability.

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Polymeric compounds in activated sludge supernatant — Characterisation and retention mechanisms at a full-scale municipal membrane bioreactor

Cited by 111 publications

References 24 publications

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

Variations in distribution and composition of extracellular polymeric substances (EPS) of biological sludge under potassium ferrate conditioning: Effects of pH and ferrate dosage

Improvement of wastewater sludge dewatering performance using titanium salt coagulants (TSCs) in combination with magnetic nano-particles: Significance of titanium speciation

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