Journal
BIORESOURCE TECHNOLOGY
Volume 320, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.actatropica.2020.124357
Keywords
Aeration frequency; Food waste composting; Oxygen supply; Enzymatic activity; Bacterial community
Funding
- National Key Research and Development Project [2018YFD1100601-03]
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This study investigated the impact of different aeration frequencies on industrial-scale composting of food waste, finding that aeration frequency influences oxygen uptake rate, spatial distribution, bacterial community succession, and compost maturity acceleration by adjusting aeration strategies.
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 O-2 concentration and the release of various enzymes by these bacteria. Regulating O-2 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).
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