Vanadium Stress-Driven Microbial Acclimation Enhances Biological Denitrification in Recycling of Vanadium-Containing Industrial Wastewater
Yihuan She, Yimin Zhang, Qiushi Zheng, Zhenlei Cai, Yue Wang, Nannan Xue
TL;DR
A new method using vanadium-stressed bacteria improves wastewater treatment by removing ammonia and recovering vanadium, supporting sustainable mining.
Contribution
A bioaugmentation strategy using vanadium-acclimated Pseudomonas sp. S.P-1 achieves high ammonia removal and vanadium recovery.
Findings
Pseudomonas sp. S.P-1 achieved >99.25% ammonia removal under optimized conditions.
Vanadium stress enhanced microbial biosorption and metabolic activity for ammonia conversion.
The process enabled simultaneous pollution control and vanadium recovery with 89.2% efficiency.
Abstract
Recirculation in vanadium mining enhances resource efficiency but risks ammonia nitrogen (NH3-N) accumulation, severely compromising leaching yields. To address this bottleneck, we developed a bioaugmentation strategy using Pseudomonas sp. S.P-1 acclimated to vanadium stress. Under optimized conditions (sodium citrate as a carbon source, C/N = 5, 5% inoculum, and pH = 8), the strain achieved exceptional NH3-N (2000 mg·L−1) removal (>99.25% within 16 days; residual NH4+ < 15 mg·L−1), 12.7% higher than the original bacteria. Mechanistic studies revealed that vanadium exposure triggered dual adaptive responses: enhanced biosorption via the stimulated synthesis of extracellular polymeric substances (EPS) enriched with negatively charged functional groups (C=O, -COOH-, and C-N), improving NH4+ adsorption capacity, and metabolic activation via an elevated transmembrane electrochemical…
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Taxonomy
TopicsVanadium and Halogenation Chemistry · Advanced Nanomaterials in Catalysis · Polyoxometalates: Synthesis and Applications