Operational Regulation of Algal-Bacterial Granular Sludge for Nitrogen Removal Pathway Reconfiguration and N(2)O Mitigation.

Operational regulation of algal-bacterial granular sludge increased nitrogen removal efficiency from 24.0% to 73.7% by reconfiguring nitrogen transformation pathways in wastewater treatment.

• Why it matters: Efficient nitrogen removal and N2O mitigation are critical for sustainable wastewater management, yet understanding how operational factors influence these processes remains limited.
• What they did: The study adjusted C/N ratio, illumination, and aeration in ABGS cultivated under low shear, analyzing their effects on nitrogen pathways and N2O emissions through systematic experiments.
• The result: Pathway reconfiguration enhanced nitrogen removal and reduced N2O emissions to 0.10%, demonstrating potential for nutrient recovery and environmental benefits, though resource inputs require careful balancing.