Extending reaction duration has minor influence on nitrite production in partial-denitrification process

Area of Science:

• Environmental Science
• Microbiology
• Wastewater Treatment

Background:

• Partial denitrification (PD) is crucial for generating nitrite required in anammox processes.
• The impact of prolonged reaction times on PD performance remains largely uninvestigated.

Purpose of the Study:

• To assess the effect of extended reaction times on nitrite production during partial denitrification.
• To evaluate the robustness of PD under organic loading shocks.

Main Methods:

• Three sequencing batch reactors were utilized to conduct partial denitrification experiments.
• Nitrite production, pH, alkalinity, and microbial community composition were monitored under varying reaction times and organic loads.

Main Results:

• Effluent nitrite concentrations remained stable despite reaction times extending up to four times longer than control.
• Partial denitrification demonstrated recovery capabilities following high organic loading events.
• Microbial analysis showed a slight decrease in Thauera abundance but maintained its predominance.

Conclusions:

• Extended reaction times have a minimal impact on partial denitrification performance.
• Partial denitrification exhibits robustness and significant technological advantages for supplying nitrite to anammox systems.