Effects of microwave and alkali induced pretreatment on sludge solubilization and subsequent aerobic digestion
Resource
BIORESOURCE TECHNOLOGY, 102(17), 7633-7640
Journal
Bioresource Technology
Pages
7633-7640
Date Issued
2011
Date
2011
Author(s)
Abstract
Individual and combined effects of microwave (MW) and alkali pretreatments on sludge disintegration and subsequent aerobic digestion of waste activated sludge (WAS) were studied. Pretreatments with MW (600 W-85°C-2 min), conventional heating (520. W-80°C-12. min) and alkali (1.5. g NaOH/L - pH 12-30. min) achieved 8.5%, 7% and 18% COD solubilization, respectively. However, combined MW-alkali pretreatment synergistically enhanced sludge solubilization and achieved 46% COD solubilization, 20% greater than the additive value of MW alone and alkali alone (8.5 + 18% = 26.5%). Moreover, the results of the batch aerobic digestion study on MW-alkali pretreated sludge showed 93% and 63% reductions in SCOD and VSS concentrations, respectively, at 16. days of SRT. The VSS reduction was 20% higher than that of WAS without pretreatment. © 2011 Elsevier Ltd.
SDGs
Other Subjects
Batch aerobic digestion; Combined effect; Conventional heating; Pre-Treatment; Pre-treatments; Pretreatment process; Sludge disintegration; Sludge solubilization; Synergistic effect; Waste activated sludges; Digestive system; Solubility; Sludge digestion; alkali; activated carbon; chemical oxygen demand; concentration (composition); heating; microwave radiation; oxic conditions; pollutant removal; solubilization; synergism; waste treatment; aerobic digestion; article; bioreactor; energy consumption; heating; microwave radiation; pH; priority journal; sludge; sludge digestion; sludge solubilization; sludge treatment; temperature; waste activated sludge; Aerobiosis; Alkalies; Microwaves; Sewage; Solubility; Temperature
Type
journal article
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