Influences of extracellular polymeric substances (EPS) on the characteristics of activated sludge under non-steady-state conditions

Yang, Shu-Fang; Li, Xiaoyan

doi:10.1016/j.procbio.2008.09.010

Cited by 243 publications

(82 citation statements)

References 31 publications

(57 reference statements)

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“…Many previous studies have demonstrated that sludge EPS component play an important role in sludge dewatering process (Mikkelsen and Keiding, 2002;Jin et al, 2004;Yang and Li 2009;Poxon and Darby, 1997;Forster, 1971), so the variations in EPS distribution and composition were investigated. Fig.…”

Section: The Influence Of Hydroxyl Aluminum Conditioning With Differementioning

confidence: 99%

Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation

et al. 2016

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a b s t r a c tChemical conditioning is one of the most important processes for improve the performance of sludge dewatering device. Aluminum salt coagulant has been widely used in wastewater and sludge treatment. It is generally accepted that pre-formed speciation of aluminum salt coagulants (ASC) has an important influence on coagulation/flocculation performance. In this study, the interaction mechanisms between sludge particles and aluminum salt coagulants with different speciation of hydroxy aluminum were investigated by characterizing the changes in morphological and EPS properties. It was found that middle polymer state aluminum (Al b ) and high polymer state aluminum (Al c ) performed better than monomer aluminum and oligomeric state aluminum (Al a ) in reduction of specific resistance to filtration (SRF) and compressibility of wastewater sludge due to their higher charge neutralization and formed more compact flocs. Sludge was significantly acidified after addition Al a , while pH was much more stable under Al b and Al c conditioning due to their hydrolysis stability. The size of sludge flocs conditioned with Al b and Al c was small but flocs structure was denser and more compact, and floc strength is higher, while that formed from Al a is relatively large, but floc structure was loose, floc strength is relatively lower. Scanning environmental microscope analysis revealed that sludge flocs conditioned by Al b and Al c (especially PAC 2.5 and Al 13 ) exhibited obvious botryoidal structure, this is because sludge flocs formed by Al b and Al c were more compact and floc strength is high, it was easy generated plentiful tiny channels for water release. In addition, polymeric aluminum salt coagulant (Al b , Al c ) had better performance in compressing extracellular polymeric substances (EPS) structure and removing sticky protein-like substances from soluble EPS fraction, contributing to improvement of sludge filtration performance. Therefore, this study provides a novel solution for improving sludge dewatering property by controlling aluminum speciation.

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Section: The Influence Of Hydroxyl Aluminum Conditioning With Differementioning

confidence: 99%

Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation

et al. 2016

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“…It was found that 1.5 mL (or 0.02 ± 0.01 g S-EPS/L) of S-EPS revealed the best settling compared to a lower or higher concentration of the EPS. An increase in SVI value with EPS concentration greater than 0.02 g/L (4 mg of S-EPS/g SS) was due to bound water increase into the aggregates, which produced highly porous flocs with low density [25]. Therefore, 0.02 g/L S-EPS concentration was used to evaluate the variation of SVI at different SS concentrations.…”

Section: Sludge Settlingmentioning

confidence: 99%

“…This was due to the formation of bigger flocs caused by higher protein content of S-EPS and B-EPS (sample collected at 48 hr) compared to C-EPS. It was widely reported that an increase of EPS concentration would lower the sludge dewaterability [25,28]. Houghton et.…”

Section: Sludge Dewaterabilitymentioning

confidence: 99%

Characterization of Extracellular Polymeric Substances (Eps) Produced by Cloacibacterium normanense Isolated from Wastewater Sludge for Sludge Settling and Dewatering

Klai¹,

Nv²,

Song³

et al. 2016

J Civil Environ Eng

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“…Bioflocculation transforms bacterial cells into sludge flocs, which facilitates biosolids-water separation including sludge sedimentation, compression, and dewatering. Extracellular polymeric substances (EPS, biopolymers that surround the bacterial cells) are believed to play an important role in the formation of sludge flocs [26]. However, the exact effects of EPS on bioflocculation and sludge-water separation are still unclear [27,28].…”

Section: Sludge Qualitymentioning

confidence: 99%

Sludge Dewatering and Mineralization in Sludge Treatment Reed Beds

Brix

2017

Water

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Sludge Treatment Reed Beds (STRBs) are widely used in Northern Europe to dewater and mineralize surplus sludge from activated sludge systems used to treat urban domestic sewage. STRBs are low-technology, energy-efficient, and do not require addition of chemicals. They dewater and stabilize the sludge and produce a final product that can be safely used as a fertilizer for agricultural crops. Long-term sludge reduction takes place in the reed beds due to dewatering and mineralization of the organic matter in the sludge. Although, in theory, a simple technique relying largely on natural processes, experience has shown that it is very important to understand and respect the basic design and operation requirements of STRBs. This paper describes the basic design and operation requirements of STRBs, with special focus on pivotal requirements to respect in order to secure proper functioning. Also, the paper summarizes performance experience concerning final dry matter content, degree of mineralization, emission of greenhouse gases, and degradation of micro-pollutants in STRBs. There are still a number of outstanding issues that are not fully understood, particularly in relation to the importance of the sludge quality for the dewatering in an STRB. Therefore, extreme care should be taken when attempting to extrapolate the use of STRBs to applications and regions outside of their 'normal' and documented area of application.

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Influences of extracellular polymeric substances (EPS) on the characteristics of activated sludge under non-steady-state conditions

Cited by 243 publications

References 31 publications

Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation

Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation

Characterization of Extracellular Polymeric Substances (Eps) Produced by Cloacibacterium normanense Isolated from Wastewater Sludge for Sludge Settling and Dewatering

Sludge Dewatering and Mineralization in Sludge Treatment Reed Beds

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