Malodorous gases production from food wastes decomposition by indigenous microorganisms

Zhang, Yuna; Liang, Zhishu; Tang, Changcheng; Liao, Wen Ting; Yu, Yun; Li, Guiying; Yang, Yan; An, Taicheng

doi:10.1016/j.scitotenv.2020.137175

Cited by 47 publications

(9 citation statements)

References 67 publications

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“…By dividing the decomposition of vegetable wastes into an initial stage (days 1–30) and a later stage (days 45–60) based on a method described in previous studies, , we found that the ARG absolute abundance also increased during the initial stage of decomposition and then decreased. This may have been because abundant nutrients in the initial stage increased the diversity and richness of the potential hosts (bacterial community) of ARGs (Table S4), increasing their abundance.…”

Section: Resultsmentioning

confidence: 66%

How Does Vegetable Waste Decomposition Influence the Antibiotic Resistome and the Human Bacterial Pathogen Structure in Leachates?

Liang

Liao

et al. 2021

ACS EST Water

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Understanding how antibiotic-resistance genes (ARGs) and pathogens in household waste leachates contribute to acquiring antibiotic resistance is profoundly significant. Leachates can impair water quality and harm the environment and human health. This study explored co-occurrence and accumulation of pathogens and ARGs in leachates during decomposition of vegetable wastes. Watercress leachates had more average ARG numbers and abundance. ARG abundances were 2.17 × 10 7 copies/mL for pepper, 1.27 × 10 7 copies/mL for watercress, and 4.93 × 10 5 copies/mL for onion. Vegetable decomposition enriched ARGs first and then decreased. Genes conferring resistance to multidrug, aminoglycosides, and β-lactam were the dominant ARGs; the main mechanism was antibiotic deactivation. Preferential co-occurrence patterns were observed across ARG types, indicating coeffects of antibiotic selection pressure and coresistance when shaping the antibiotic resistome. The pathogenic community varied significantly during vegetable decomposition. ARG levels positively correlated with the dominant Enterococcus but negatively correlated with Bartonella and Bacteroides. Functional genes shared by all waste leachates were mainly linked to carbohydrate (9.2%) and amino acid transport and metabolism (8.2%). ARGs were positively associated with defensive virulence factors and autoinducers. The quorum sensing system regulated ARG levels by balancing signal molecule synthesis and degradation gene expression. These findings provide insights into the mechanism underlining vegetable waste decomposition regarding occurrence and spread of ARGs in leachates.

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Section: Resultsmentioning

confidence: 66%

How Does Vegetable Waste Decomposition Influence the Antibiotic Resistome and the Human Bacterial Pathogen Structure in Leachates?

Liang

Liao

et al. 2021

ACS EST Water

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“…All three composts were composed of a significant amount of carbohydrates, which could account for the dominance of Lactobacillus. Lactobacillus and Peptoniphilus were also shown to be associated with the production of malodorous gases (dimethyl disulfide) in food waste composts (Zhang et al, 2020). In real food waste treatment, decreasing their abundance might aid in the reduction of odors in composting, which would be particularly helpful in the household environment.…”

Section: Discussionmentioning

confidence: 99%

Identification of Microbial Flora and Isolation of Functional Strains Related to the Degradation of Domestic Waste

Huang¹,

Liu²,

Zong³

2022

Preprint

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A large amount of food waste is currently generated due to rapid global population growth, which results in environmental pollution and economical burdens for waste disposal. Composting is one of the most environmentally friendly and cost-effective methods for food waste treatment. This study aims to give insight into microbial community structure and functional strains of household food waste compost, which might optimize the composting process and help increase food waste treatment efficiency. The microbial community is characterized via 16S rRNA sequencing. The dominant microbes are assigned to the three phyla of Firmicutes, Proteobacteria and Bacteroidetes, and the main fungi are assigned to the phylum of Ascomycota. We isolated some functional microbes from the compost microbiota, including Alcaligenes faecalis, Paenochrobactrum glaciei, Lysinibacillus fusiformis, and Proteus terrae. Moreover, we detected lipase and cellulase activities in the compost liquid. However, the measured lipase and cellulase activity is low, and further enhancement of the lipase activity in the food waste compost might increase waste treatment ability. Therefore, we isolated a cellulase and lipase harboring Bacillus cereus strain from municipal a wastewater treatment plant. The B. cereus strain have high-level lipase activity, which could be used for food waste treatment in the future.

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“…Although information on the relationship between VOC emission and microbial flora is extremely limited, several bacteria are reported to affect emission of VOCs. For example, volatile organic sulfur compounds (VOSCs) such as DMDS and DMTS are positively correlated with the presence of microorganisms including Lactobacillus and Leuconostoc (Zhang et al 2020). Another study showed that Bacillus and Actinomycetes might produce VOSCs during decomposition (Mayrhofer et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Deodorize with Bugs: Inoculation with black soldier fly larvae alters the microbiome and volatile organic compound profile of decomposing food waste

Michishita

Shimoda

Furukawa

et al. 2022

Preprint

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The black soldier fly (BSF; Hermetia illucens) is used in sustainable processing of many types of organic waste. However, organic waste being decomposed by BSF produces strong odors, hindering more widespread application. The odor components and how they are produced have yet to be characterized. We found that digestion of food waste by BSF significantly alters the microbial flora, based on metagenomic analyses, and the odor components generated, as shown by thermal desorption gas chromatography mass spectrometry analysis. Inoculation with BSF significantly decreased production of volatile organic sulfur compounds (dimethyl disulfide and dimethyl trisulfide), which are known to be released during methionine and cysteine metabolism by Lactobacillus and Enterococcus bacteria. BSF inoculation significantly changed the abundance of Lactobacillus and Enterococcus and decreased microbial diversity overall. These findings may help in optimizing use of BSF for deodorization of composting food waste.

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Malodorous gases production from food wastes decomposition by indigenous microorganisms

Cited by 47 publications

References 67 publications

How Does Vegetable Waste Decomposition Influence the Antibiotic Resistome and the Human Bacterial Pathogen Structure in Leachates?

How Does Vegetable Waste Decomposition Influence the Antibiotic Resistome and the Human Bacterial Pathogen Structure in Leachates?

Identification of Microbial Flora and Isolation of Functional Strains Related to the Degradation of Domestic Waste

Deodorize with Bugs: Inoculation with black soldier fly larvae alters the microbiome and volatile organic compound profile of decomposing food waste

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