Performance and microbial community analysis of a microaerophilic sulfate and nitrate co-reduction system
Journal
Chemical Engineering Journal
Journal Volume
330
Pages
63-70
Date Issued
2017
Author(s)
Abstract
The succession of complex internal sulfur cycles and sulfide-oxidizing bacteria community has been observed during wastewater treatment under microaerophilic conditions or denitrifying conditions. However, research on the microbial community involved in sulfur cycles under microaerophilic denitrifying conditions is scarce. In this study we characterized the dominant bacteria and microbial community structure stimulated by microaerophilic conditions in a sulfate and nitrate co-reduction system. Full denitrification was accomplished and the sulfate removal efficiency ranged from 79.93% to 96.81% for all the tested scenarios, with the degree of sulfate reduction slightly decreased with higher O 2 feeding rate. The proportion of S 0 to influent SO 4 2? was much greater at microaerophilic stages (27.5–69.2%) versus the anaerobic stage (11.1%). The peak S 0 recovery (69.2%) was achieved at O 2 ?=?4.0?mL/min. Illumina sequencing technology was used to characterize the bacterial community and the results indicated that Bacteroidetes, Firmicutes, Proteobacteria, Spirochaetae and Synergistetes members were dominant in microbial communities, however the variation of these dominant members across all the operating conditions did not well respond to reactor performance. Further analysis revealed that the structure of the microbial community, including community richness and evenness, might better respond to reactor performance, which deserves more research in future. ? 2017
Subjects
Bacterial community structure
Microaerophilic
Sulfate and nitrate co-reduction
Sulfide oxidation
SDGs
Type
journal article