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Improvement of sludge anaerobic degradability by combined electro-flotation and electro-oxidation treatment

Paper ID Volume ID Publish Year Pages File Format Full-Text
2992 147 2014 5 PDF Available
Title
Improvement of sludge anaerobic degradability by combined electro-flotation and electro-oxidation treatment
Abstract

•Combined electro-flotation and oxidation pretreatment for sludge biodegradability.•IrO2/Ti anode oxidation shows high efficiency in enhancing degradability of sludge.•The operating conditions for electro-flotation and electro-oxidation are optimized.

Recently, bioenergy recovery from sludge biomass has attracted increasing attention due to the high demand for renewable energy resources. In order to enhance methane production from sludge biomass, electrochemical treatment can be used as a novel and efficient pretreatment for the hydrolysis of sludge biomass. In this study, a combined electro-flotation and electro-oxidation pretreatment was employed to improve the anaerobic degradability of sludge biomass. Electro-flotation was efficient in separating flocs in the mixed liquor and led to a sludge volume reduction greater than 60% after 10 min of operation at a current density of 4.72 mA cm−2. Electro-oxidation using IrO2/Ti anode was performed to improve the anaerobic degradability of sludge and resulted in a 30% increase in COD solubilization after 30 min of operation at current density of 9.45 mA cm−2. The factors affecting electro-oxidation, i.e. the gap width between anode and cathode, current density and applied voltage, were investigated to optimize the operating conditions. A biochemical methane potential assay demonstrated that the anaerobic biodegradability of sludge was enhanced by combined electro-flotation and electro-oxidation pretreatment.

Keywords
Electro-flotation; Electro-oxidation; Biogas; Biodegradation; Cell disruption; Process integration
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Improvement of sludge anaerobic degradability by combined electro-flotation and electro-oxidation treatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 90, 15 September 2014, Pages 44–48
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us