Nitrogen removal from low C/N wastewater in a novel Sharon&DSR (denitrifying sulfide removal) reactor

作者：Guo, Hongliang; He, Tongyuan; Chang, Jo-Shu; Liu, Peng; Lee, Duu-Jong^*

来源：Bioresource Technology, 2022, 362: 127789.

DOI：10.1016/j.biortech.2022.127789

• Sharon reaction
• Denitrifying sulfide removal
• Nitrite
• C/N ratio

Denitrification reactions commonly remove nitrate and other reactive nitrogen (Nr) from wastewater. The C/N ratio indicates the sufficiency of organic carbons to drive heterotrophic denitrification; a low C/N ratio frequently leads to poor denitrification performance in wastewater treatment. This study proposed and tested a novel Sharon & DSR (denitrifying sulfide removal) process, with nitrite generated by the Sharon reactions and sulfide from sulfur-reducing reactions for promoting the following nitrite-based denitrification and denitrifying sulfide removal (DSR) process. The present reactor can remove nitrate at an efficiency of 97.7 %-93.5 % at an influent C/N ratio of 0.646-0.737 over a 96-d continuous-flow test. The microbial community study reveals the functional strains corresponding to individual groups of critical reactions. The stoichiometry analysis reveals the potential to apply the nitrite-based DSR process for Nr removal from ultra-low C/N (< 0.64) wastewaters, experimentally demonstrated in the present study with a C/N ratio of 0.16-0.39.

• 单位
  东北林业大学