Work

The Application of Sn2− in Autotrophic Denitrification Process for Advanced Nitrogen Removal in Wastewater Treatment

Year: 2025

Type: article

Abstract: This study presents a cost-effective and feasible technique for the deep denitrification of wastewater, based on sulfur autotrophic denitrification mediated by polysulfides (Sn2−). Various polysulfides were used as electron donors in an aerobic/anoxic sequencing batch reactor (SBR) to simulate nitrification and denitrification processes. The performance of different polysulfide species and their respective dosages were evaluated to determine the optimal conditions for nitrogen removal. Under optimal nitrogen removal conditions with a dosing of 19.2 mg S/L from Na2S3, the system was operated continuously for 38 days, with low sludge production during the process. During stable operation, the system achieved an average removal of 7.3 mg/L of NO3−-N, corresponding to a removal efficiency of 23.1%. No significant accumulation of NO2−-N was observed in the effluent, and the average utilization efficiency of Na2S3 reached 83.7%. Continuous dosing of Na2S3 promoted the enrichment of sulfur autotrophic denitrification-related microorganisms within the system.

Source: Separations

DOI: 10.3390/separations12060157

Authors: Yingxue Sun, Xiaolei Zhang, Chenli Ye, Ziying He, Hongjie Wang, Ji Li

Institutions: Harbin Institute of Technology, State Key Laboratory of Urban Water Resources and Water Environment

Language: English

Topic: Wastewater Treatment and Nitrogen Removal

Subfield: Pollution

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: gold

Estimated APC paid: $3,137