Chang, Chia-JungChia-JungChangTyagi, Vinay KumarVinay KumarTyagiSHANG-LIEN LO2012-10-162018-06-282012-10-162018-06-282011http://ntur.lib.ntu.edu.tw//handle/246246/242676Individual 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.en-US[SDGs]SDG7Batch 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; Temperaturejournal article10.1016/j.biortech.2011.05.031http://ntur.lib.ntu.edu.tw/bitstream/246246/242676/-1/39.pdf