Regulating aeration intensity to simultaneously improve humification and mitigate gaseous emissions in food waste digestate composting: Performance and bacterial dynamics

This study assessed the impact of aeration intensity on food waste digestate composting to simultaneously govern organic humification and gaseous emissions. Results show that an augment in the aeration intensity from 0.1 to 0.4 L·kg−1 DM·min−1 provided more oxygen to facilitate organic consumption a...

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Bibliographic Details
Published in:The Science of the total environment 2023-09, Vol.889, p.164239-164239, Article 164239
Main Authors: Zhang, Lanxia, Gao, Xingzu, Shi, Tong, Xu, Zhicheng, Li, Guoxue, Luo, Wenhai
Format: Article
Language:English
Subjects:
Aeration intensity
Composting
Food
Food waste digestate
Gaseous emissions
Gases
Humification
Refuse Disposal
Soil
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Summary:This study assessed the impact of aeration intensity on food waste digestate composting to simultaneously govern organic humification and gaseous emissions. Results show that an augment in the aeration intensity from 0.1 to 0.4 L·kg−1 DM·min−1 provided more oxygen to facilitate organic consumption and thus temperature increase, but slightly restrained organic humification (e.g. less humus content and higher E4/E6 ratio) and substrate maturity (i.e. lower germination index). Furthermore, increasing aeration intensity inhibited the proliferation of the genera Tepidimicrobium and Caldicoprobacter to alleviate methane emission and enriched the genus Atopobium to boost hydrogen sulphide production. More importantly, increasing aeration intensity limited the growth of the genus Acinetobacter for nitrite/nitrogen respiration, but strengthened aerodynamics to blow out nitrous oxide and ammonia produced inside piles. Principal component analysis comprehensively indicated that a low aeration intensity of 0.1 L·kg−1DM·min−1 facilitated precursors synthesis toward humus and simultaneously mitigated gaseous emissions to improve food waste digestate composting. [Display omitted] •Aeration intensity of 0.1 L·kg−1DM·min−1 favored humification and gas reduction.•Increasing aeration intensity enhanced organic consumption to restrain humification.•High aeration intensity restrained the growth of methanogens to reduce CH4 emission.•Aeration intensity increase enriched the genus Atopobium to boost H2S emission.•This also reduced bacterial functions for N cycle but enforced N2O & NH3 emissions.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2023.164239