| 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 |
|
| DOI |
10.1016/j.wasman.2022.09.035 |
| 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. |
| Author Keywords |
Enhanced anaerobic digestion; Sewage sludge pretreatment; Advanced wet -oxidation and steam explosion; Thermophilic anaerobic digestion; Optimization of pretreatment |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000874643800002 |
| WoS Category |
Engineering, Environmental; Environmental Sciences |
| Research Area |
Engineering; Environmental Sciences & Ecology |
| PDF |
http://manuscript.elsevier.com/S0956053X22004809/pdf/S0956053X22004809.pdf
|