Optimization of Calcium-Modified Siderite-Driven Sulfur Autotrophic Denitrification Systems

Microbial community analysis showed that the significant increase in biomass and the functional synergistic enrichment of Thiobacillus, Sulfurimonas and Ferritrophicum were the core driving factors for enhancing the removal efficiency of nitrogen and phosphorus. The Fe2 +/S0 synergistic electron donor mechanism significantly up-regulated the expression levels of denitrification functional genes (Narg, Nirk) and sulfur oxidation genes (SQR)