Using modified biochar as a physical-chemical conditioner for waste activated sludge dewatering

2021 ◽  
Author(s):  
Wenjian Gao ◽  
Lei Song
Keyword(s):  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Sludge Dewatering ◽  
Modified Biochar ◽  
Physical Chemical

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.

Enhancement of Waste Activated Sludge Dewaterability by Potassium Ferrate Pretreatment

2014 ◽  
Vol 1073-1076 ◽  
pp. 937-940 ◽  
Author(s):  
Xiao Rong Kang ◽  
Ya Li Liu
Keyword(s):  
Activated Sludge ◽  
Optimal Dose ◽  
Soluble Proteins ◽  
Waste Activated Sludge ◽  
Potassium Ferrate ◽  
Sludge Dewatering ◽  
Cationic Polyacrylamide ◽  
Floc Structure ◽  
Sludge Dewaterability

Potassium ferrate was used to enhance sludge dewatering and the mechanism was studied. Sludge floc structure was effectively destroyed by potassium ferrate, and the soluble COD, proteins and polysaccharides increased with the increase of potassium ferrate. The optimal dose for sludge disintegration was 100 mg/gSS, and the corresponding maximal SCOD, soluble proteins and polysaccharides concentrations were 2455, 800 and 145 mg/L, respectively. Sludge dewaterability was enhanced significantly with cationic polyacrylamide (C-PAM) application, and the SRF decreased to 0.72×1010m/kg from 50.12×1010m/kg. This study indicated that the potassium ferrate pretreatment was helpful for enhancing sludge dewaterability and reducing the coagulant dose.

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...

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