Enhancing methane production of anaerobic digested sewage sludge by advanced wet oxidation &amp; steam explosion pretreatment

Dutta, Nalok; Garrison, Richard; Usman, Muhammad; Ahring, Birgitte Kiaer

doi:10.1016/j.eti.2022.102923

Enhancing methane production of anaerobic digested sewage sludge by advanced wet oxidation & steam explosion pretreatment

Journal Article · Tue Sep 27 00:00:00 EDT 2022 · Environmental Technology & Innovation

DOI:https://doi.org/10.1016/j.eti.2022.102923· OSTI ID:2386939

Dutta, Nalok ^[1]; Garrison, Richard ^[2]; ^[3]; Ahring, Birgitte Kiaer ^[4]

Washington State University, Richland, WA (United States); Washington State University
Clean-Vantage, Richland, WA (United States)
Washington State University, Richland, WA (United States)
Washington State University, Richland, WA (United States); Washington State University, Pullman, WA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Washington State University, Pullman, WA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO)

Grant/Contract Number:: EE0008933

OSTI ID:: 2386939

Journal Information:: Environmental Technology & Innovation, Journal Name: Environmental Technology & Innovation Vol. 28; ISSN 2352-1864

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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