Journal
BIORESOURCE TECHNOLOGY
Volume 279, Issue -, Pages 108-116Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.01.115
Keywords
Anaerobic digestion; Calcium peroxide; Methane production; Ultrasonic; Waste activated sludge
Funding
- National Natural Science Foundation of China, China [51508178, 51779089, 51521006]
- Natural Science Funds of Hunan Province for Distinguished Young Scholar [2018JJ1002]
- Planned Science and Technology Project of Hunan Province, China [2017WK2091]
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This study reported a novel and high-efficient pretreatment method for anaerobic digestion, i.e., combining calcium peroxide (CaO2) 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 CaO2/g VSS combined with US (1 W/ml, 10 min). Under this condition, the maximal methane yield of 211.90 +/- 2.6 L CH4/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 CaO2 (0.1 g/g VSS). Mechanism investigations revealed that CaO2 + 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 CaO2 + US was applied.
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