Ozonation of sewage sludge prior to anaerobic digestion led to Methanosaeta dominated biomethanation

Date

2021-01-01

Author

Tuncay, Sera
Akcakaya, Merve
İçgen, Bülent

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Anaerobic digestion (AD) of sewage sludge is commonly employed for sludge stabilization and energy generation at wastewater treatment plants. Of pretreatment techniques used to accelerate rate-limiting hydrolysis step in AD, economically feasible ozonation is prevalent and permits sludge reduction via oxidation. The stability of AD process during ozonation is crucial for successful energy recovery and needs optimal dosage that encourages methanogenic consortium efficient in methane production. This study, therefore, aimed at investigating the impact of 0.03, 0.06 and 0.09 g O3/g TSS ozone doses on the productivity of mesophilic semi-batch lab-scale 5 L AD operated at a hydraulic retention time of 15 d with organic loading rates of 1.45–1.80 g VS/L.d and on its methanogenic consortium. Measurements of biogas, methane and quantification of methanogenic consortium were done by water displacement, gas chromatography, and fluorescence in situ hybridization techniques, respectively. Although all applied ozone doses improved sludge characteristics, the highest average daily removal efficiencies with 35% COD, 32% TS, 42% VS, 60% TSS and 69% VSS were achieved through ozonation with 0.06 g O3/g TSS ozone dose. The same ozone dose also yielded 48% more methane in the biogas recovered and this biomethanation was correlated to the abundance of acetotrophic Methanosaeta species.

Subject Keywords

Anaerobic digesters, Biomethanation, Methanosaeta, Ozone pretreatment

URI

https://hdl.handle.net/11511/94945

Journal

Fuel

DOI

https://doi.org/10.1016/j.fuel.2021.122690

Collections

Department of Environmental Engineering, Article

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Two-stage anaerobic digestion of ozonated sewage sludge predominantly took over by acetotrophic methanogens with increased biogas and methane production Akcakaya, Merve; Tuncay, Sera; İçgen, Bülent (2022-06-01) Ozonation of sewage sludge prior to single-stage anaerobic digestion (SAD) has been reported to increase biogas and/or methane production. However, no studies have evaluated the impact of ozone pre-treatment on two-stage anaerobic digestion (TAD) of sewage sludge over the production of these renewable fuels. Present study, therefore, aimed at investigating the impact of 0.06 g O3/g TSS ozone-pretreated sewage sludge on the productivity of mesophilic semi-batch lab-scale TAD and on its methanogenic consortiu...

Citation Formats

S. Tuncay, M. Akcakaya, and B. İçgen, “Ozonation of sewage sludge prior to anaerobic digestion led to Methanosaeta dominated biomethanation,” Fuel, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/94945.