Rapidly startup of partial nitrification in sequencing batch reactor and microbiological analysis

AbstractBoth temperature and dissolved oxygen (DO) have impact on partial nitrification. Through experiment and analysis in this study, the collaborative effect of temperature and DO on partial nitrification can be expressed as (temperature increases 1°C)/(DO decreases 0.1 mg L−1) = 4.28. However, increasing temperature for wastewater treatment plant is scarcely possible. With room temperature (19–22°C), 140 cycles experiments were conducted in sequencing batch reactor (SBR). Results showed that DO concentration of 0.2–0.8 mg L−1 is suitable for rapidly startup of partial nitrification. No visible difference between 0.2 and 0.5 mg L−1 and 0.5–0.8 mg L−1 on rapidly startup of partial nitrification was existent. Microbiological analysis showed that system mainly contained 10 groups, β-Proteobacteria, uncultured bacterium, and Bacteroidetes were three dominant populations whose percentage were 32.5, 28.75, and 17.5%, respectively. Compared to the percentage of nitrite-oxidizing bacteria (NOB), ammonium-oxidi...