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• W4297361071 endingPage "102923" @default.
• W4297361071 startingPage "102923" @default.
• W4297361071 abstract "Anaerobic digestion (AD) of sewage sludge is associated with lowered carbon conversion efficiency due to the recalcitrance of microbial cells in the Waste Activated Sludge (WAS) from the aeration basins with 50 % of the dry weight still being present after AD. The effect of Advanced Wet Oxidation & Steam Explosion (AWOEx) pretreatment on the methane yield at variable temperatures (165–200 °C), residence time (15–45 min) and oxygen dosage (1%–10% based on VS concentration) was tested in this study. Central composite design (JMP® Pro) was used to design 19 runs of AWOEx pretreatment of dewatered digested sewage sludge (DADSS) at different operating conditions. After pretreatment the DADSS was fed to 19 bioreactors operated in semi-continues mode at 37 °C. The highest average methane yields of 183 mL/g VS and 170 mL/g VS were found for the bioreactors receiving DADSS pretreated at 165 °C with a retention time of 15 min and 10 % O2 (Condition 1), and, 182.5 °C with a retention time of 15 min and 5.5 % O2 (Condition 2). This corresponds to an increase in the methane production of 156.2 % and 140.5 % compared to the methane production from the DADSS without pretreatment. Plotting the results using the response surface model showed that temperature and O2 dosage had a significant effect on the methane yield while residence time was of lower importance. Importantly, thermic treatment without oxygen showed far lower methane yields of 114.5 mL/gVS and 120.26 mL/gVS, respectively of the two best conditions described above. Through this two-step AD process, we were able to achieve a net 94% improved methane yield compared to conventional AD of sewage sludge by implementing a second AWOEx pretreatment step (followed by secondary AD) with 26.9% decreased organics content, further reducing the cost of the final disposal of the treated sewage sludge." @default.
• W4297361071 created "2022-09-28" @default.
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• W4297361071 date "2022-11-01" @default.
• W4297361071 modified "2023-10-14" @default.
• W4297361071 title "Enhancing methane production of anaerobic digested sewage sludge by advanced wet oxidation & steam explosion pretreatment" @default.
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• W4297361071 doi "https://doi.org/10.1016/j.eti.2022.102923" @default.
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