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Updated: Sep 15, 2025

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Enhanced autotrophic denitrification under salinity stress by bioaugmentation of Sulfurimonas: performance
Liang Cui1, Shasha Wang1, Xiaxing Cao1
1State Key Laboratory Breeding Base of Marine Genetic Resources, Third Institute of Oceanography, MNR, Xiamen, PR China.
Abstract:
Sulfur autotrophic denitrification (SADN) is a promising nitrogen removal process for industrial wastewater treatment, but elevated salinity is a common inhibitory factor that affects SADN performance. In this study, the sequencing batch biofilm reactor (SBBR) was enhanced with isolated salt-tolerant Sulfurimonas strains. Results showed that bioaugmentation improved the reactor's denitrification efficiency from 70.21 % to 98.79 %. As salinity increased from 1 % to 4 %, nitrogen removal efficiency experienced short fluctuations and quickly stabilized above 98.50 %. The abundance of Sulfurimonas increased from 13.06 % to 26.14 % with increasing salinity, becoming the most dominant taxon at high salinity. This genus maintained the highest abundance during sulfur disproportionation within the entire reactor. Network analysis indicated that Sulfurimonas primarily exhibited competitive relationships with other microbial groups. Additionally, there was a notable increase in gene abundance associated with denitrification and dissimilatory nitrate reduction. Overall, this study offers an efficient alternative method for nitrate removal in carbon-limited, high-salinity wastewater.
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