Journal
BIORESOURCE TECHNOLOGY
Volume 362, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127789
Keywords
Sharon reaction; Denitrifying sulfide removal; Nitrite; C/N ratio
Funding
- Fundamental Research Funds for the Central Universities [2572021BA01]
- China Postdoctoral Science Foundation [2019M661238]
- Hei Long Jiang Postdoctoral Foundation [Z19109]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2018137]
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This study proposed and tested a novel process for wastewater treatment, which utilizes nitrite generated by Sharon reactions and sulfide from sulfur-reducing reactions to promote denitrification and denitrifying sulfide removal. The results showed that this process efficiently removes nitrate under different C/N ratios, and the functional strains corresponding to critical reactions were identified.
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.
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