| Title | Improved valorization of sewage sludge in the circular economy by anaerobic digestion: Impact of an innovative pretreatment technology |
|---|---|
| ID_Doc | 5590 |
| Authors | Dutta, N; Giduthuri, AT; Khan, MU; Garrison, R; Ahring, BK |
| Title | Improved valorization of sewage sludge in the circular economy by anaerobic digestion: Impact of an innovative pretreatment technology |
| Year | 2022 |
| Published | |
| Abstract | Anaerobic digestion (AD) of sewage sludge shows low carbon conversion efficiency (CCE) due to the poor biodegradability of sewage sludge. The lack of digestibility is specifically linked to the waste-activated sludge (WAS) making up the majority of sewage sludge along with a smaller portion of primary sludge, depending on the wastewater treatment plant configuration. In this study, we examine the Advanced Wet Oxidation & Steam Explosion process (AWOEx) for improving the CCE of digested sewage sludge (DSS) by thermophilic AD. The effect of the pretreatment temperature in the range between 160 and 185 degrees C at a fixed residence time of 20 min with and without oxygen added at a dosage of 5 % of the organics present was tested. Methane yield improved by 97.92 % to 183.91 +/- 4.93 mL/g vS over the untreated DSS (control), whose methane yield was 92.92 +/- 9.07 mL/g vS We have demonstrated for the first time that 84 % of the organics in sewage sludge can successfully be transformed into biogas following AWOEx pretreatment, which can contribute significantly to the circular economy instead of greenhouse gas emissions from landfilling. |
| http://manuscript.elsevier.com/S0956053X22004809/pdf/S0956053X22004809.pdf |
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