Enhanced methane production from waste activated sludge by combining calcium peroxide with ultrasonic: Performance, mechanism, and implication

Publication Type:
Journal Article
Citation:
Bioresource Technology, 2019, pp. 108 - 116
Issue Date:
2019-05-01
Filename Description Size
Enhanced.pdfPublished Version1.85 MB
Adobe PDF
Full metadata record
© 2019 Elsevier Ltd This study reported a novel and high-efficient pretreatment method for anaerobic digestion, i.e., combining calcium peroxide (CaO 2 ) with ultrasonic (US), by which not only the methane production was remarkably improved but also the removal of refractory organic contaminants was enhanced. Experimental results showed the optimum condition for methane production was achieved at 0.1 g CaO 2 /g VSS combined with US (1 W/ml, 10 min). Under this condition, the maximal methane yield of 211.90 ± 2.6 L CH 4 /kg VSS was obtained after 36 d of anaerobic digestion, which was respectively 1.36-fold, 1.19-fold and 1.26-fold of that from the control, solo US (1 W/ml, 10 min) and solo CaO 2 (0.1 g/g VSS). Mechanism investigations revealed that CaO 2 + US not only improved the disintegration of waste activated sludge (WAS) but also increased the proportion of biodegradable organic matters. Moreover, the total frequency of recalcitrant contaminants contained in WAS decreased significantly when CaO 2 + US was applied.
Please use this identifier to cite or link to this item: