Journal
BIORESOURCE TECHNOLOGY
Volume 368, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.128351
Keywords
Micro -aeration strategy; Co -digestion; Kinetic model; Sequencing batch reactor; Daily methane yield
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This study investigated the effects of different micro-aeration (MA) strategies on anaerobic digestion (AD) of poultry litter and wheat straw. Daily MA during batch AD of wheat straw resulted in the highest increase (16.5%) in cumulative methane yield compared to the control. Daily MA during co-digestion of wheat straw and poultry litter further improved the methane yield by 15.1%. The results support the feasibility of applying micro-aeration in the AD of agricultural wastes.
In this study, different micro-aeration (MA) strategies for anaerobic digestion (AD) of poultry litter (PL) and wheat straw (WS) were examined. MA at different stages (pretreatment, middle, pretreatment plus middle, and daily) in batch AD of WS showed that daily MA had the highest increase (16.5 %) of the cumulative methane yield (CMY) compared to the control. Batch co-digestion (Co-AD) of WS and PL with daily MA obtained a fur-therly improved (15.1 %) CMY of 225.44 N mL CH4/g vS added. The modified Gompertz model and Cone model were good in fitting the methane yield kinetics of MA engaged AD process (R2 greater than 0.99). Daily MA shortened the lag phase of Co-AD by 3.4 %. The sequencing batch reactor for the Co-AD of WS and PL showed an increased (21.5 %) daily methane yield when 0.5-h/d MA was employed. The results provided support for the application of micro-aeration in the AD of agricultural wastes.
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