Intermittent aeration to reduce gaseous emission and advance humification in food waste digestate composting: Performance and mechanisms

The dominant role of bacterial community and network characteristics drive the humification process and greenhouse gas emissions during plant residues composting under different aeration rates

“…4A,4B,4C). Similar results were widely reported and could be due to the bacterial succession driven by temperature shift (Qi et al, 2022;Cheng et al, 2023). Compared with T1, T2 and T3 had signi cantly higher α-diversity indices (Fig.…”

“…The pH in all treatments slightly declined to 8.3-8.6 on day 30, with the lowest pH in T1. Such expectation could be related to the production of organic acid induced by lower aeration intensity (Cheng et al, 2023). The EC value increased in the rst 10 days and then declined until day 30 and nally stabilized (Fig.…”

“…This could be related to signi cant higher level of O 2 in T3 in the thermophilic composting stage. Cheng et al (2023) showed that aeration pattern (intermittent or continuous aeration) could affect the succession of bacterial structure by adjusting the oxygen contents in composting mixtures. However, as composting prolonged, bacterial structure were more even, since the composting samples from different treatments in the same stage tended to group together.…”

“…Shen et al (2011) demonstrated that intermittent-aeration signi cantly increased CH 4 and N 2 O emissions during chicken manure composting. Cheng et al (2023) found that compared with other on/off ratios, intermittent aeration with the ratio of 1:1 had more advantages in reducing organic mineralization and emission of nitrous oxide and ammonia during food waste digestate composting. Zhang et al (2020) found that aeration rate of 0.4 L kg DM/min accelerate composting maturity signi cantly, while lower rate of 0.2 L kg DM/min resulted in much lower gaseous emission during livestock manure composting.…”

“…Aeration control is considered as the key factor in uencing the biodegradation of organic matter and GHG emission during composting process (Cheng et al, 2023;Zeng et al, 2022). Both the effects of aeration patterns (continuous or intermittent) and intensities on composting process have been widely evaluated, particularly for the composting of animal manures and food wastes (Shen et al, 2011;Cheng et al, 2023;Zhang et al, 2020). Shen et al (2011) demonstrated that intermittent-aeration signi cantly increased CH 4 and N 2 O emissions during chicken manure composting.…”