Effect of acid and surfactant treatment on activated sludge dewatering and settling

Chen, Yinguang; Yang, Haizhen; Gu, Guowei

doi:10.1016/s0043-1354(00)00565-0

Cited by 283 publications

(121 citation statements)

References 11 publications

Supporting

Mentioning

112

Contrasting

Unclassified

Order By: Relevance

“…The presence of negative charge on the surface of particles can produce electronic repulsion and keep stability of a colloidal system. Acidic treatment could not only destroy EPS structure but caused protonation of anionic functional groups of EPS and aggregation of sludge system, consequently resulting in conversion of bound water into free water [23]. Low pH might affect proteins in two ways.…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…However, due to the complex dynamics of sludge matrix it is still challenging to assess the influence played by extracellular organic features on sludge dewaterability [19]. Indeed, some authors report that dewaterability of sludge improves after EPS reduction [20]; on the contrary, some authors [21,22] found that sludge dewaterability initially increases with EPS content but then decreases once EPS content rises over a threshold value, thus rising some controversial in such aspects. Moreover, rheological features (e.g.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Waste activated sludge dewaterability: comparative evaluation of sludge derived from CAS and MBR systems

Capodici

Mannina

Torregrossa

2016

Desalination and Water Treatment

View full text Add to dashboard Cite

Sludge dewatering represents, nowadays, one of the greatest operational cost to wastewater treatment cycle. Physical-chemical and biological parameters are recognized to influence the sludge dewaterability. However, many authors agree in identifying the sludge origin as one of the main aspect involved in sludge dewaterability. Indeed, the sludge origin such as the processes involved in liquid-solid separation, seriously affect the sludge features. In order to elucidate the key factors influencing the dewaterability process, the present work is aimed to investigate the influence of the treatment plant lay-out on sludge dewaterability. The analyzed sludge samples were derived from four conventional activated sludge and two membrane bioreactor wastewater treatment plants. Experimental investigation was focused to highlight difference in sludge dewaterability derived from the application of European Standards adopted for sludge characterization. The achieved results confirmed the complexity of the inter-relationships between many factors affecting the sludge dewaterability.

show abstract

“…The water content of activated sludge can be decreased to approximately 80% with existing mechanical dewatering technologies. To this end, various methods have been proposed to improve sludge dewaterability, such as the addition of acids and surfactants, Fenton's reagent pre-treatment, fungal treatment, ultrasonication, and microwave irradiation (Chen et al, 2001;Eskicioglu et al, 2007;Fakhru'l-Razi and Molla, 2007;Tony et al, 2008;Feng et al, 2009a;2009b;Yu et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

“…Chemical conditioning is a tactic that improves mechanical dewatering, flocculating the sludge with conditioners, such as calcium oxide, ferric chloride, and polyacrylamide (Chen et al, 2001). Also, thermal and thermochemical processes and chemical oxidation using hydrogen peroxide can enhance cake dewaterability in two ways: (i) they degrade extracellular polymeric substances (EPS) proteins and polysaccharides reducing the water retention properties; and (ii) they promote flocculation which reduces the amount of fine flocs (Neyens et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved waste-activated sludge dewatering using sludge/oil emulsion, ultrasonic and microwave technologies

Kim¹,

Kim²,

Chung

2014

WSA

View full text Add to dashboard Cite

Conventional dewatering technologies, such as centrifuges, belt filter presses, and rotary vacuum filters, are not effective methods for treating sewage sludge with high water content. This study evaluated the field-scale feasibility of new technologies that use emulsion, ultrasonication, and microwaves to dewater sludge. Emulsion technology lowered the water content in sludge to 60%, but the overall process was too complex to incorporate into the design of commercial plants due to the requirement for oil-and methanol-recovery facilities. Ultrasonication had low dewatering and energy efficiency with long irradiation times, indicating that it would be difficult to implement in a field plant. The water content of sludge was reduced to 60% within 120 s using microwaves, but dewatering efficiency depended on the thickness and volume of the sludge. In a pilot-scale test, the average energy consumption was 0.54 kWh/kg of water removed, and the final water content of the sludge cake reached 60% within 30 min.

show abstract

Effect of acid and surfactant treatment on activated sludge dewatering and settling

Cited by 283 publications

References 11 publications

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

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

Waste activated sludge dewaterability: comparative evaluation of sludge derived from CAS and MBR systems

Improved waste-activated sludge dewatering using sludge/oil emulsion, ultrasonic and microwave technologies

Contact Info

Product

Resources

About