Abstract
The undesired sulfur cycle derived by microbial population can ultimately causes the serious problems of sewerage systems. However, the microbial community characters under dynamic environment factors in actual sewerage system is still not enough. This current study aimed to character the distributions and compositions of microbial communities that participate in the sulfur cycle under the dynamic environmental conditions in a local sewerage system. To accomplish this, microbial community compositions were assessed using 454 high-throughput sequencing (16S rDNA) combined with dsrB gene-based denaturing gradient gel electrophoresis. The results indicated that a higher diversity of microbial species was present at locations in sewers with high concentrations of H2S. Actinobacteria and Proteobacteria were dominant in the sewerage system, while Actinobacteria alone were dominant in regions with high concentrations of H2S. Specifically, the unique operational taxonomic units could aid to characterize the distinct microbial communities within a sewerage manhole. The proportion of sulfate-reducing bacteria, each sulfur-oxidizing bacteria (SOB) were strongly correlated with the liquid parameters (DO, ORP, COD, Sulfide, NH3-N), while the Mycobacterium and Acidophilic SOB (M&A) was strongly correlated with gaseous factors within the sewer, such as H2S, CH4, and CO. Identifying the distributions and proportions of critical microbial communities within sewerage systems could provide insights into how the microbial sulfur cycle is affected by the dynamic environmental conditions that exist in sewers and might be useful for explaining the potential sewerage problems.
Highlights
Sewerage system undertakes a significant role in the collection and transportation of wastewater in urban city
The results showed that the sulfate-reducing bacteria (SRB) microbial diversity in each sample mainly distributed between 1.0 and 1.6, which was a relatively concentrated in microbial-diversity fingerprints (Figures 3A,B; Supplementary Figure S1)
Location E was selected as a representative high hydrogen sulfide exposure (HHSE) site, while location A was selected as a representative low hydrogen sulfide exposure (LHSE) site
Summary
Sewerage system undertakes a significant role in the collection and transportation of wastewater in urban city. Complex microbial biochemical processes occur in sewerage pipes as the specific environment and abundant nutrient in wastewater. These microbes produce some negative effects, undesirable biochemical sulfur processes that can cause serious problems of sewerage. Biogenic sulfuric acid can react with concrete, causing serious corrosion that could eventually result in the structural failure of the sewerage system (Zhang et al, 2008). As microbial populations play a vital role in processing sulfur in sewerage systems, the characteristics of functional bacteria will determine the dynamic biochemical processes presented in the system. Gaining an understanding of the distinct bacterial populations related sulfur process in sewerage systems can aid odor control and help mitigate problems with sewerage system corrosion
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