Aeration rate improves the compost quality of food waste and promotes the decomposition of toxic materials in leachate by changing the bacterial community. (November 2021)

• Record Type: Journal Article
• Authors: Wang, Yumei; Tang, Ya; Li, Mengyao; Yuan, Zengwei
• Is Part Of: Bioresource technology. Volume 340(2021)
• Publication Date: 2021-11
• Subjects: Aeration rate -- Bacterial community -- Food waste -- Composting -- Leachate treatment; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125716
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Higher ventilation increased germination index of diluted leachate. The characterization of aeration-shaped bacterial communities was investigated. NH4 +, NO3 − contents and pH affected the key aeration-shaped bacteria most. Aeration rate of 3.25 L kg −1 DM initial min −1 was recommended. Abstract: The effect of aeration rates on maturity, leachate and bacterial community succession during a pilot-scale food waste composting were evaluated. Out of the four aeration rates (0.44, 3.25, 6.50 and 11.65 L kg −1 DM initial min −1 for T1, T2, T3 and T4, respectively) that were conducted, results found T2 to be the recommended ventilation rate considering the quality of compost and the leachate utilization. Higher ventilation increased germination index of diluted leachate. The abundance of Proteobacteria in mesophilic stage (35.5%) and Actinobacteria in cooling stage (30.6%) in T4 were higher than in other groups (7.9%–17.5%), suggesting the formation of a select community categorized by the capacity of degrading the organic matter and promoting maturity. The key bacteria of aeration-shaped bacterial communities such as Sporosarcina, Pseudomonas and Thermobifida were identified and they could be manipulated by increasing NH4 +, NO3 − contents and pH in the initial stage of composting.