Effects of salinity on nitrite and elemental sulfur accumulation in a double short-cut sulfur autotrophic denitrification process

Double short-cut sulfur autotrophic denitrification (DSSADN) coupled with Anammox is of great significance in the low-carbon treatment of nitrogen-containing wastewater. In order to achieve high salinity autotrophic nitrogen removal, the effects of different salinities on the accumulation characteristics of NO2--N and S-0 and microorganisms in DSSADN process were studied. The results showed that the effect of salinity on the DSSADN process could be categorized into the stimulation, stable, and inhibition. When the salinity gradually increased to 2.5 %, the highest NO2--N production rate (NiPR) and S-0 production rate ((SPR)-P-0) of DSSADN were 0.54 kg/(m(3)center dot d) and 1.1 kg/(m(3)center dot d) respectively. NiPR and (SPR)-P-0 gradually decreased as the salinity increased to more than 3 %. However, salinity had a relatively low impact on nitrite accumulation efficiency and S-0 accumulation efficiency, which were 80 % and 81.5 %, respectively, when the salinity reached 5 %. Salinity has a great influence on the structure and abundance of microbial communities in the system.

Automated summary

Double short-cut sulfur autotrophic denitrification (DSSADN) coupled with Anammox is important for low-carbon treatment of nitrogen-containing wastewater. The effects of different salinities on the accumulation characteristics of NO2--N and S-0 and microorganisms in DSSADN process were studied. Salinity had a significant impact on the DSSADN process and microbial communities in the system.