Abstract
In this work, the impact of exogenous aerobic bacteria mixture (EABM) on municipal solid waste (MSW) is well evaluated in the following aspects: biogas production, leachate analysis, organic waste degradation, EABM population, and the composition of microbial communities. The study was designed and performed as follows: the control bioreactor (R1) was filled up with MSW and the culture medium of EABM and the experimental bioreactor (R2) was filled up with MSW and EABM. The data suggests that the composition of microbial communities (bacterial and methanogenic) in R1 and R2 were similar at day 0, while the addition of EABM in R2 led to a differential abundance of Bacillus cereus, Bacillus subtilis, Staphylococcus saprophyticus, Staphlyoccus xylosus, and Pantoea agglomerans in two bioreactors. The population of exogenous aerobic bacteria in R2 greatly increased during hydrolysis and acidogenesis stages, and subsequently increased the degradation of volatile solid (VS), protein, lipid, and lignin by 59.25%, 25.68%, 60.47%, and 197.62%, respectively, compared to R1. The duration of hydrolysis and acidogenesis in R2 was 33.33% shorter than that in R1. At the end of the study, the accumulative methane yield in R2 (494.4 L) was almost three times more than that in R1 (187.4 L). In addition, the abundance of acetoclasic methanogens increased at acetogenesis and methanogenesis stages in both bioreactors, which indicates that acetoclasic methanogens (especially Methanoseata) could contribute to methane production. This study demonstrates that EABM can accelerate organic waste degradation to promote MSW biodegradation and methane production. Moreover, the operational parameters helped EABM to generate 20.85% more in accumulative methane yield. With a better understanding of how EABM affects MSW and the composition of bacterial community, this study offers a potential practical approach to MSW disposal and cleaner energy generation worldwide.
Highlights
With increasing global urbanization and industrialization, municipal solid waste (MSW) is a growing problem worldwide due to its impact on human health and the environment [1]
Some studies indicate that physical and chemical treatments could influence biodegradation and methane production of MSW [11,12,13], while others suggest that bacteria plays a crucial role in MSW biodegradation [14]
The study observed that organic waste degradation and methane production increase when exogenous aerobic bacteria mixture (EABM) codigest with MSW
Summary
With increasing global urbanization and industrialization, municipal solid waste (MSW) is a growing problem worldwide due to its impact on human health and the environment [1]. The study observed that organic waste degradation and methane production increase when EABM codigest with MSW. The aim of this research is to study the impact of EABM on sustainable methane production associated with MSW biodegradation. For this purpose, the interaction of EABM and organic waste will first be presented by connecting the data of EABM reproduction, organic waste degradation, and biogas production (methane, carbon dioxide, and oxygen concentration). This study presents conclusive data that EABM promotes methane production by accelerating organic waste degradation, and outlines the operational parameters for EABM in MSW and the effects of EABM on microbial community. This research presents new insight about EABM, which may help advance the development of an applicable approach for MSW biodegradation and cleaner energy generation at landfills
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