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Enhanced biomethane production via hydrodynamic cavitation pretreatment and co-digestion of brown and DAF sludge
Date
2025-05-01
Abstract
This study introduces a co-digestion and vortex-based hydrodynamic cavitation (HC) pretreatment of brown and dissolved air flotation (DAF)
sludge derived from dairy processing waste streams to enhance biomethane potential (BMP). Co-digestion experiments were carried out for
varying ratios of brown-to-DAF sludge (1:1, 2%; 3:1, 4%). The BMP tests, conducted at 39 °C using a 15-reactor system with a 400 mL reaction
volume and overhead stirrers, demonstrated that HC treatment elevated soluble chemical oxygen demand (sCOD) of brown and DAF sludges
by over 34% after 80 passes through HC device. Combining DAF with brown sludge improved methane yields and reduced the time to reach
peak BMP. Loading 2% volatile solids (VS) with a 1:1 ratio resulted in methane production exceeding 90% of theoretical BMP, surpassing individual
brown and DAF sludge BMPs (73 and 84%, respectively). Maximum VS removal surpassed 85%, achieving a peak methane yield of over
717 mL/g-VS. These findings offer insights into addressing effluent treatment challenges and highlight the potential of co-digestion for
enhanced waste valorisation.
Supervisor
Description
Publisher
IWA publishing
Citation
Water Science & Technology 91 (9), 1032
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Files
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Islam_2025_Enhanced.pdf
Adobe PDF, 615.64 KB
Keywords
Funding code
Funding Information
Sustainable Development Goals
External Link
Type
Article
Rights
http://creativecommons.org/licenses/by-nc-sa/4.0/