Industrial-scale food waste composting: Effects of aeration frequencies on oxygen consumption, enzymatic activities and bacterial community succession. Issue 6 (January 2021)

• Record Type: Journal Article
• Authors: Zhang, Shuchi; Wang, Jingli; Chen, Xu; Gui, Jiaxi; Sun, Yue; Wu, Donglei
• Is Part Of: Bioscience reports. Volume 30:Issue 6(2010)
• Publication Date: 2021-01
• Subjects: Aeration frequency -- Food waste composting -- Oxygen supply -- Enzymatic activity -- Bacterial community; Molecular biology -- Periodicals; Cytology -- Periodicals; 572.8
• DOI: 10.1016/j.biortech.2020.124357
• Languages: English
• ISSNs: 0144-8463

Abstract

Graphical abstract: Highlights: Adjusting aeration strategies could effectively improve composting maturity. Cellulase, sucrase and phosphatase were the main enzymes affecting composting. Moderate aeration could increase the abundance of mesophiles in mesophilic period. Abstract: Industrial-scale composting of food waste (FW) was performed at different aeration frequencies (C_5_25: 5 min aeration + 25 min interval, C_10_20: 10 min aeration + 20 min interval, C_15_15: 15 min aeration + 15 min interval and CK: stuffiness) to ascertain the optimal aeration frequency to accomplish polymerization and humification of compost. The tested aeration frequencies affected the oxygen uptake rate, oxygen spatial distribution, and ultimately influenced the humification of compost. Extensive aeration was not beneficial to accumulate nitrogen and phosphorus during composting. Aeration frequency influenced the succession of bacterial community primarily through affecting O2 concentration and the release of various enzymes by these bacteria. Regulating O2 concentration by adjusting aeration strategies may provide guidance for accelerating maturity of composting. Considering various factors, this paper recommends the scheme of heating period (C_5_25), thermophilic period (C_15_15) and psychrophilic period (no aeration).