Effects of ultrasonic disintegration on sludge microbial activity and dewaterability

Ultrasonic treatment can disintegrate sludge, enhance microbial activity and improve sludge dewaterability at different energy inputs. To find their relationship, the three phenomena during ultrasonic treatment were investigated synchronously, and an experimental model was established to describe th...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-01, Vol.161 (2), p.1421-1426
Main Authors: Huan, Li, Yiying, Jin, Mahar, Rasool Bux, Zhiyu, Wang, Yongfeng, Nie
Format: Article
Language:English
Subjects:
Anaerobiosis
Applied sciences
Biodegradation, Environmental
Bioreactors
Chemistry Techniques, Analytical - methods
Chlorides
Dewatering
Disintegration
Exact sciences and technology
Ferric Compounds - chemistry
General purification processes
General treatment and storage processes
Industrial Waste
Microbial activity
Other industrial wastes. Sewage sludge
Pollution
Refuse Disposal - methods
Sewage
Sonication
Time Factors
Ultrasonic treatment
Ultrasonics
Waste activated sludge
Waste Disposal, Fluid - methods
Wastes
Wastewaters
Water Purification - methods
Water treatment and pollution
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Summary:Ultrasonic treatment can disintegrate sludge, enhance microbial activity and improve sludge dewaterability at different energy inputs. To find their relationship, the three phenomena during ultrasonic treatment were investigated synchronously, and an experimental model was established to describe the process of ultrasonic sludge disintegration. Analysis results showed that the changes of sludge microbial activity and dewaterability were dependent on sludge disintegration degree during ultrasonic treatment. When sludge disintegration degree was lower than 20%, sludge flocs were disintegrated into micro-floc aggregates and the microbial activity increased over 20%. When sludge disintegration degree was over 40%, most cells were destroyed at different degree, and sludge activity decreased drastically. Only when sludge disintegration degree was 2–5%, sludge dewaterability was improved with the conditioning of FeCl 3. It was also found that the sonication with low density and long duration was more efficient than sonication with high density and short duration at the same energy input for sludge disintegration, and a transmutative power function model can be used to describe the process of ultrasonic disintegration.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.04.113