Alkalinity regulation in a sulfur autotrophic denitrifying filter substantially reduced total dissolved solids and sulfate in effluent. (March 2022)

• Record Type: Journal Article
• Authors: Pan, Hui; Cui, Min-Hua; Zhang, Chao; Liu, Lan-Ying; Li, Jing; Jiang, Qian; Zhang, Xue-Dong; Zheng, Zhi-Yong; Zhang, Yan; Liu, He
• Is Part Of: Bioresource technology. Volume 348(2022)
• Publication Date: 2022-03
• Subjects: Alkalinity regulation -- Electron utilization efficiency -- Microbial community -- Sulfate and total dissolved solids -- Sulfur autotrophic denitrification filter; 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.2022.126751
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: SL-SAD and S-SAD achieved comparable denitrification performance. TDS and sulfate in the S-SAD effluent were reduced by a third. Thiobacilhus and Thermomonas were significantly enriched in S-SAD. S-SAD was adjustable in operation and efficient in electron utilization. Abstract: Sulfur autotrophic denitrification (SAD) filters are considered a promising technology due to their stable and excellent performance in nitrogen removal, affordable costs, and operational advantages. In this work, a novel operational strategy that employed sodium bicarbonate as an alkalinity source in the autotrophic denitrification filter (S-SAD) was established. With the sufficient supply of alkalinity, the S-SAD reached an excellent denitrification performance (98.01%±0.43%) with a nitrate concentration of 10 mg/L in influent and hydraulic retention time of 3 hrs. The total dissolved solids increment and sulfate concentration in effluent were significantly reduced by one-third, compared with that of the traditional SAD process under the same conditions. The analysis of microbial community indicated that Thiobacilhus, typical species with the functions of simultaneous sulfur oxidation and denitrification, was evidently enriched in the S-SAD. Thus, this present work demonstrated a feasible, relatively cost-effective and environmentally friendly approach to operate SAD towards further application.