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

被引：21

作者：

Cheng, Jingwen ^{[1
]}

Gao, Xingzu ^{[1
]}

Yan, Zhaowei ^{[1
]}

Li, Guoxue ^{[1
,3
]}

Luo, Wenhai ^{[1
,2
]}

Xu, Zhicheng ^{[1
,2
]}

机构：

[1] China Agr Univ, Coll Resources & Environm Sci, Beijing Key Lab Farmland Soil Pollut Prevent & Rem, Beijing 100193, Peoples R China

[2] China Agr Univ, Organ Recycling Inst Suzhou, Wuzhong Dist, Suzhou 215128, Peoples R China

[3] China Agr Univ, Sanya Inst, Sanya 572025, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2023年 / 371卷

关键词：

Food waste digestate; Intermittent aeration; Gaseous emission; Humification; Bacterial community; ANAEROBIC-DIGESTION; SLUDGE; MANURE; CONSUMPTION; DEGRADATION;

D O I：

10.1016/j.biortech.2023.128644

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

This study investigated the performance and mechanisms of intermittent aeration to regulate gaseous emission and humification during food waste digestate composting. In addition to continuous aeration, three intermittent aeration regimes were conducted with the on-off interval ratio at 3:1, 2:1, and 1:1 within each 30 min, respectively. Results showed that intermittent aeration regimes reduced gaseous emission and enhanced humi-fication during composting. In particular, intermittent aeration with the on/off ratio of 1:1 was more effective to reduce organic mineralization than other regimes, which alleviated the emission of nitrous oxide and ammonia by 63.1% and 75.7% in comparison with continuous aeration, respectively. In addition, this aeration regime also enhanced the content of humic acid by 24.1%. Further analysis demonstrated that prolonging aeration-off in-tervals could enrich facultative bacteria (e.g. Atopobium and Clostridium) from digestate and inhibit the prolif-eration of several aerobic bacteria (e.g. Caldicoprobacter and Marinimicrobium) to retard organic mineralization for humification.

引用

页数：10

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