Advanced sludge treatment affects extracellular polymeric substances to improve activated sludge dewatering

2004 ◽  
Vol 106 (2-3) ◽  
pp. 83-92 ◽  
Author(s):  
E Neyens
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Sludge Dewatering ◽  
Sludge Treatment

Study on the effect of chitosan conditioning on sludge dewatering

2019 ◽  
Vol 79 (3) ◽  
pp. 501-509 ◽  
Author(s):  
Jin Zhang ◽  
Qing Hu ◽  
Jie Lu ◽  
Shuang Lin
Keyword(s):  
Moisture Content ◽  
Extracellular Polymeric Substances ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Organic Polymer ◽  
Sludge Dewatering ◽  
Sludge Treatment ◽  
Residual Sludge ◽  
Sludge Cake ◽  
Polymer Flocculant

Abstract The difficulty of residual sludge dehydration is the major problem in sewage treatment. The reduction of moisture content in sludge can reduce the sludge volume significantly and is conducive to the subsequent disposal of sludge. As an organic polymer flocculant, chitosan (CTS) is widely used in water and waste water treatment. In this study, CTS was used in sludge treatment to improve the sedimentation and dehydration properties of sludge. When treated with CTS, the moisture content of sludge cake decreased from 85.9% to 83.0%, the SV30 decreased to about 1/2, and the sludge volume reduced to 82.9%. Further analysis showed that the zeta potential (ζ-potential) of the sludge changed from negative value to positive value, and the D50 of the sludge was larger than that of the raw sludge. In addition, when the moisture content of the sludge cake was reduced to the lowest, the concentration of extracellular polymeric substances (EPS) and SCOD was the largest and the |ζ| decreased to the lowest. CTS improved the dehydration and sedimentation performance of sludge mainly by factors of electrical neutralization, adsorption bridging and dissolution of EPS.

Extracellular polymeric substances and dewaterability of waste activated sludge during anaerobic digestion

2014 ◽  
Vol 70 (9) ◽  
pp. 1555-1560 ◽  
Author(s):  
Fenxia Ye ◽  
Xinwen Liu ◽  
Ying Li
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Extracellular Polymeric Substance ◽  
Extracellular Polymeric Substances ◽  
Waste Activated Sludge ◽  
Sludge Dewatering ◽  
Capillary Suction ◽  
Relationship Analysis ◽  
The Relationship ◽  
Insight Into

Anaerobic digestion of waste activated sludge was conducted to gain insight into the mechanisms underlying change in sludge dewaterability during its anaerobic digestion. Unexpectedly, the results indicated that sludge dewatering properties measured by capillary suction time only deteriorated after 10 days of anaerobic digestion, after which dewaterability recovered and remained stable. The loosely bound extracellular polymeric substance (LB-EPS) content increased three-fold after 20 days of anaerobic digestion, and did not change significantly during the remaining 30 days. The tightly bound EPS (TB-EPS) content reduced slightly after 20 days of anaerobic digestion, and stabilized during the last 30 days. Polysaccharides (PS) and proteins (PN) content in LB-EPS increased after 10 days of anaerobic digestion. However, PS and PN contents in TB-EPS decreased slightly. The relationship analysis showed that only LB-EPS correlated with dewaterability of the sludge during anaerobic digestion.

Dewaterability of Aerobic Granular Sludge

2011 ◽  
Vol 90-93 ◽  
pp. 2944-2948 ◽  
Author(s):  
Yan Nian Zhou ◽  
Jun Li ◽  
Jing Li ◽  
Su Wei
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Specific Resistance ◽  
Structural Characteristics ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Sludge Treatment ◽  
Distribution Features ◽  
Water Ratio

Dewatering characteristics of aerobic granular sludge, activated sludge and sludge which mixed flocculant was studied. It was shown that the specific resistance of aerobic granular sludge is lower than activated sludge and sludge with mixed flocculant was in the range of 1.07~1.80×109 S2/g, and it increased with the increase of diameters of the granules. The water ratio of aerobic granular sludge by pressure filtrate dehydration was decreased to 83.5~86.1%, activated sludge and sludge which mixed flocculant were 94.2% and 91.4%, respectively. The structural characteristics, distribution features of extracellular polymeric substances and PN/PS values of aerobic granular sludge were important factors of its excellent dewaterability. Aerobic granular sludge technology was regarded as one of the promising biotechnologies in sludge treatment.

The fate and impact of coagulants/flocculants in sludge treatment system

2021 ◽  
Author(s):  
qizi fu ◽  
xuran liu ◽  
yanxin Wu ◽  
Dongbo Wang ◽  
Qiuxiang Xu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Treatment System ◽  
Waste Activated Sludge ◽  
Sludge Dewatering ◽  
High Accumulation ◽  
Sludge Treatment

Coagulants and flocculants have been widely used in various applications, especially in wastewater treatment and sludge dewatering, which result in their high accumulation in waste activated sludge (WAS). In the...

Understanding the evolution of stratified extracellular polymeric substances in full-scale activated sludges in relation to dewaterability

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1282-1294 ◽  
Author(s):  
Weijun Zhang ◽  
Siwei Peng ◽  
Ping Xiao ◽  
Jie He ◽  
Peng Yang ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Full Scale ◽  
Sludge Dewatering ◽  
Dynamic Variation

The dynamic variation in soluble EPS resulted into the fluctuation of activated sludge dewatering behavior in full-scale WWTPs.

scholarly journals Free nitrous acid breaks down extracellular polymeric substances in waste activated sludge

RSC Advances ◽  
2015 ◽  
Vol 5 (54) ◽  
pp. 43312-43318 ◽  
Author(s):  
Tingting Zhang ◽  
Qilin Wang ◽  
Javaid Khan ◽  
Zhiguo Yuan
Keyword(s):  
Activated Sludge ◽  
Nitrous Acid ◽  
Extracellular Polymeric Substances ◽  
Cell Lysis ◽  
Waste Activated Sludge ◽  
Treatment Technology ◽  
Free Nitrous Acid ◽  
Sludge Treatment

The chemical breakdown of EPS components by FNA has been proved to account for the improvement of sludge biodegradability in addition to enhanced cell lysis in FNA-based sludge treatment technology.

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