Effects of organic loading rates on microbial communities and biogas production from water hyacinth: a case of mono‐ and co‐digestion

Abstract

Background Anaerobic digestion is a microbial driven process, which results in biogas production. Although important, the relative abundance of microbial communities can be affected by disturbances such as feeding rates. In this study, the effects of irregular organic loading rates on anaerobic digestion of water hyacinth (mono‐ and co‐digestion) as well as on bacterial and archaeal communities were investigated. The process was conducted at different feeding stages during which the process stability, biogas production, composition and microbial community structure were monitored. Results Bacterial communities were more influenced by irregular organic loading rates in comparison with archaeal communities. Although microbial community shifts were observed in both mono‐ and co‐digestion, the shift was more prevalent in co‐digestion. Moreover, process stability was evidenced in some stages of mono‐digestion, where the FOS/TAC ratio was within the optimal range. However, for co‐digestion, the low FOS/TAC ratio showed process instability. Conclusion Overall, irregularity in organic loading rates affected the microbial community composition as well as their CH4 production. © 2018 Society of Chemical Industry

Leachate recirculation effects on solid‐state anaerobic digestion of Pennisetum hybrid and microbial community analysis

“…At the phylum level, Bacteroidetes, Firmicutes, Proteobacteria and Synergistetes were the most predominant phyla in each LBR test sample, accounting for 89.70–98.76% abundance. The predominant phylum in this study is similar to that in mono‐digestion of water hyacinth, a common aquatic plant biomass . Previous studies also have shown that Bacteroidetes play an important role in degrading polysaccharides of plant biomass, and Firmicutes are accepted as being cellulose‐degrading bacteria in AD .…”

“…The predominant phylum in this study is similar to that in mono-digestion of water hyacinth, a common aquatic plant biomass. 34 Previous studies also have shown that Bacteroidetes play an important role in degrading polysaccharides of plant biomass, 35,36 and Firmicutes are accepted as being cellulose-degrading bacteria in AD. 37 Initial degradation of organic matter has been recorded to involve Proteobacteria, with many of them utilizing glucose and VFAs.…”

Applying PICRUSt and 16S rRNA functional characterisation to predicting co-digestion strategies of various animal manures for biogas production

“…The OTU table generated was exported to the R-studio for further statistical analyses. R packages: vegan, ape, labdsv and ggplot were installed and used for statistical analyses and plotting 50 .…”

Whole genome sequence of Serratia marcescens 39_H1, a potential hydrolytic and acidogenic strain

“…Bacterial strain 39_H1 was isolated from previously running digesters of Nkuna et al [ 11 ] that had water hyacinth and cow dung as feedstocks. One milliliter of digestate sample was serially diluted under aseptic conditions up to 10 −6 dilution and 0.1 ml of each dilution was spread plated on nutrient agar and incubated for 24 h at 28 ± 2 °C.…”