AI Article Synopsis
- The study examines how high salt levels impact freshwater Anammox bacteria, particularly focusing on their responses to different salts like NaCl, KCl, and NaSO.
- The research found that each salt has a distinct level of inhibitory effect, with varying concentrations leading to 50% inhibition of bacterial activity.
- It was also revealed that salinity affects the transport of crucial compounds like ammonium and nitrite, with both ionic stress and the specific types of ions playing significant roles in the impairment of bacterial function.
Article Abstract
The biggest challenge to apply Anammox to treat wastewater with elevated salt content is the inhibitory effect of salinity on freshwater Anammox bacteria (FAB). Most of the research into salinity inhibition has focused on the osmotic pressure effect, while the inhibitory effect and its mechanisms induced by ion composition are poorly understood. In this study, the individual and combined effect of NaCl, KCl and NaSO on FAB (>99% belonging to Ca. Brocadia genera) were systematically investigated by batch tests. The corresponding responses of mRNA abundance of three functional genes (including nitrite reductase gene (nirS), hydrazine synthase gene (hzsB) and hydrazine dehydrogenase gene (hdh)) under different salt conditions were analyzed. The results indicated that NaCl, KCl and NaSO have different inhibition effects, with the 50% inhibition at 0.106, 0.096 and 0.063 M, respectively. The combined inhibition of NaCl+KCl and NaCl+NaSO on FAB were both synergistic; while the combined inhibition of NaCl+KCl+NaSO was additive. The responses of mRNA (of genes: nirS, hzsB and hdh) suggested NaCl inhibited the transport of ammonium; NaSO inhibited both nitrite and ammonium transport; high salinity inhibited functional enzyme activity. These results suggest both ionic stress and ion composition contributed to the observed inhibition.
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| http://dx.doi.org/10.1016/j.watres.2020.116432 | DOI Listing |
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