Nitrogen removal from low C/N wastewater in a novel Sharon&DSR (denitrifying sulfide removal) reactor. (October 2022)

• Record Type: Journal Article
• Authors: Guo, Hongliang; He, Tongyuan; Chang, Jo-Shu; Liu, Peng; Lee, Duu-Jong
• Is Part Of: Bioresource technology. Volume 362(2022)
• Publication Date: 2022-10
• Subjects: Sharon reaction -- Denitrifying sulfide removal -- Nitrite -- C/N ratio; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127789
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: A novel Sharon&DSR process was proposed and tested. Nitrite from Sharon and sulfide from SR promote nitrite-based denitrification. This reactor removes > 93.5 % fed nitrate at an influent C/N ratio of 0.646–0.737. The nitrite-based DSR process removes Nr from ultra-low C/N (0.16–0.39). Abstract: 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.