Experimental analysis of centrifugal dewatering process of polyelectrolyte flocculated waste activated sludge

Chu, Chien‐Ming; Lee, D.J

doi:10.1016/s0043-1354(00)00539-x

Cited by 32 publications

(23 citation statements)

References 10 publications

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“…Chu and Lee [50] experimentally investigated the centrifugal separation of moisture from activated sludge subject to cationic polyelectrolyte flocculation. Not as suggested in conventional centrifugal-filtration models, the most significant moisture-removal stages included filtrate to flow through a wet cake.…”

Section: Dewater Characters and Devices Of Sludgementioning

confidence: 99%

A review on the dewaterability of bio-sludge and ultrasound pretreatment

Xia¹,

Han²,

Luo³

et al. 2004

Ultrasonics Sonochemistry

156

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Bio-sludge, which contains large quantities of water, biomass and extracellular polymeric substances (EPS), is difficult to be dewatered as a "super-compactable" sludge [Water Res. 35 (5) (2001) 1358]. Reported water content in bio-sludge was commonly about 80-90% wt after dewatering process. The EPS and the form of water in sludge influences the structure of sludge. Adding cationic fluctuations can change the form of water in sludge and increase the velocity of dewatering process, but has little influence on the final water content. According to Bien's work [Water Sci. Technol. 36 (4) (1997) 287], a combination of ultrasound or other method could agglomerate the sludge, improve the activities of biomass [Ultrasonics 38 (2000) 711; Ultrasonics 40 (2002) 25], enhance anaerobic process [Water Sci. Technol. 36 (11) (1997) 155; Water Sci. Technol. 36 (11) (1997) 121; Water Res. 35 (8) (2001) 2003; Water Sci. Technol. 36 (12) (1997) 117] and decrease over 10% final water content of sludge. The mechanisms of ultrasonic influence on sludge are not very clear, but the application of ultrasound to industrial process is relatively easy and possible.

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Section: Dewater Characters and Devices Of Sludgementioning

confidence: 99%

A review on the dewaterability of bio-sludge and ultrasound pretreatment

Xia¹,

Han²,

Luo³

et al. 2004

Ultrasonics Sonochemistry

156

View full text Add to dashboard Cite

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“…In addition, as plenty of charges in the floc interior were inaccessible, the disintegration of flocs by enzyme treatment could cause more exposure of surfaces and more negatively charged functional groups; thus, simultaneous addition of CaCl 2 contributed to higher increase of zeta potential. The increase of zeta potential was beneficial to destroy sludge particle stability; thus, sludge particles congregated with each other and formed large flocs to settle, leading to an improvement in bioflocculation [34], which supported the decrease of filtrate turbidity in Fig. 3.…”

Section: Zeta Potentialmentioning

confidence: 54%

Effect of Calcium Ions on Dewaterability of Enzymatic-Enhanced Anaerobic Digestion Sludge

Luo

Yang

et al. 2015

Appl Biochem Biotechnol

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Waste-activated sludge (WAS) solubilized remarkably after enzymatic-enhanced anaerobic digestion, but its dewaterability was deteriorated. In this study, a novel method was performed to improve the dewaterability of enzymatic-enhanced anaerobic digestion sludge by adding CaCl2 (0.01~1.00 g/g total sludge). The capillary suction time (CST), moisture content, and filtrate turbidity were employed to characterize the dewaterability of WAS, and the possible mechanisms involved were clarified. The results showed the dewaterability did not worsen when CaCl2 was added before sludge digestion, and the CST, moisture content, and filtrate turbidity were notably reduced with the increase of CaCl2 dosage. It also shown that calcium ions played an important role in the bioflocculation of digested sludge by neutralizing negative charges on the surface of sludge. In addition, soluble protein initially lowered a little and then observably improved with the addition of CaCl2, while soluble carbohydrate was reduced sharply first and then bounced back afterwards. The interactions between calcium ions and the biopolymer further enhanced the dewatering of sludge through bridging of colloidal particles together.

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“…Moreover, the drag force acting on the fluid passing through solid volume dx can be stated in the following form: [29][30][31] …”

Section: Unified Analysismentioning

confidence: 99%

Unified Analysis of Dewatering and Drying of Sludge Cake

Hsu

Mujumdar

et al. 2010

Drying Technology

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To remove water from a suspension one needs to break down the binding energy between the adjacent water and the solid surface and to convey this water out of the suspension system. Using the binding energy between water and solids and the disrupting energy provided by mechanical and thermal means, this work presents a unified analysis on the dewatering of wet materials using binding energy as a clarification index. The binding energy versus residual water content plot for a wastewater sludge estimated the extent of dewatering each stage and the corresponding energy requirement.

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Experimental analysis of centrifugal dewatering process of polyelectrolyte flocculated waste activated sludge

Cited by 32 publications

References 10 publications

A review on the dewaterability of bio-sludge and ultrasound pretreatment

A review on the dewaterability of bio-sludge and ultrasound pretreatment

Effect of Calcium Ions on Dewaterability of Enzymatic-Enhanced Anaerobic Digestion Sludge

Unified Analysis of Dewatering and Drying of Sludge Cake

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