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/kg and their combinations with 2 and 7 mgFe/g. The biogas yield increased from 106 (control) to 143 (25,000 kJ/kg) and 308 mL/g with NFS (7 mgFe/g + 15,000 kJ/kg). The methane content increased from 55.6 to 66%, and the maximum VS removal was 11.5% at 7 mgFe/g + 15,000 kJ/kg. The results demonstrated that NFS was effective in intensifying the process.
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| http://dx.doi.org/10.1016/j.biortech.2019.01.021 | DOI Listing |
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