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Nanoferrosonication: A novel strategy for intensifying the methanogenic process in sewage sludge
- Lizama, Alfredo Córdova, Figueiras, Cristian Carrera, Gaviria, Liliana Alzate, Pedreguera, Alejandro Zepeda, Ruiz Espinoza, Juan Enrique
- Bioresource technology 2019 v.276 pp. 318-324
- anaerobic digestion, biogas, iron, methane, methanogens, nanoparticles, sewage sludge, ultrasonics
- In this work, the effect of coupling ultrasonic pretreatment with dosing of zero-valent iron nanoparticles (nanoferrosonication, “NFS”) to improve the anaerobic digestion of sewage sludge was studied. Biochemical methane potential tests were conducted at 15,000 and 25,000 kJ/kgTS and their combinations with 2 and 7 mgFe0/gVS. The biogas yield increased from 106 (control) to 143 (25,000 kJ/kgTS) and 308 mL/gVS with NFS (7 mgFe0/gVS + 15,000 kJ/kgTS). The methane content increased from 55.6 to 66%, and the maximum VS removal was 11.5% at 7 mgFe0/gVS + 15,000 kJ/kgTS. The results demonstrated that NFS was effective in intensifying the process.