Enhancement of Batch Waste Activated Sludge Digestion by Microwave Pretreatment
Authors: Eskicioglu, Cigdem; Kennedy, Kevin J; Droste, Ronald L
Source: Water Environment Research, Volume 79, Number 11, October 2007 , pp. 2304-2317(14)
Publisher: Water Environment Federation
Abstract:Batch anaerobic digesters were used to stabilize microwave (MW)-irradiated waste activated sludge (WAS). A low temperature range (50–96 °C) MW irradiation was applied. Effects of pretreatment temperature (T) and intensity (I), concentration (C) and percentage of sludge pretreated (PT) were investigated in a multilevel factorial statistical design containing 54 mesophilic batch reactors by monitoring cumulative biogas production (CBP). Variance analysis (ANOVA) determined that the most important factors affecting WAS solubilization were temperature, intensity, and sludge concentration. Improvements in CBP from WAS were significantly affected by sludge percentage pretreated, temperature, and concentration. Pretreatment resulted in 3.6 ± 0.6 and 3.2 ± 0.1 fold increases in soluble to total chemical oxygen demand (SCOD/TCOD) at high and low sludge concentrations, respectively. WAS, microwaved to 96 °C, produced the greatest improvement in CBP with 15 ± 0.5 and 20 ± 0.3% increases over controls after 19 d of digestion at low and high WAS concentrations. Dewaterability of microwaved sludge was enhanced after anaerobic digestion.
Document Type: Research Article
Publication date: October 1, 2007
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