Abstract
Nitrate or nitrite may be utilized as solitary electron acceptors for biological sulfide oxidation. In the presence of a limited sulfide concentration (360 mg S/L), the effect of multiple nitrogen (N) sources on the synchronized sulfur and nitrogen removal process was investigated based on the reactants biotransformation, product generation and bacterial genera analysis. Upon gradual transition from nitrate to nitrite, sulfide and nitrogen elimination percentages dropped from 99.46 ± 1.11% and 96.41 ± 1.30% to 71.57 ± 1.33% and 12.31 ± 6.80%, respectively. Synchronously, the elemental sulfur conversion percentage increased from 58.94 ± 1.21% to 90.49 ± 2.64%. A simulation model was established to investigate the contribution of reduced nitrate and nitrite towards sulfur- products separately. According to Pearson correlations, no significant relationship was observed amongst community richness/diversity and influent nitrogen source; while Principal component analysis (PCA) suggested that each phase formed a distinct group. Sulfurovum and Sulfurimonas were the dominant genera in all phases.
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