ZHAOKe-xin,WANGYi,LIBin-juan,et al.Effect of Potassium Chlorate on Two-stage Partial Nitritation/Anammox for Treating Low Ammonia Nitrogen Wastewater[J].China Water & Wastewater,2024,40(9):20-25.
Effect of Potassium Chlorate on Two-stage Partial Nitritation/Anammox for Treating Low Ammonia Nitrogen Wastewater
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第9期
Page:
20-25
Column:
Date of publication:
2024-05-01
- Abstract:
- In order to investigate the effect of potassium chlorate (KClO3) addition on the treatment of low ammonia nitrogen wastewater in a two-stage partial nitritation/anammox (PN/A) biofilm reactor, the PN at low ammonia nitrogen concentration was firstly established and maintained under different conditions. Finally, the temperature was lowered under the condition of KClO3 addition and the PN effluent was coupled as anammox influent. The results showed that the stable operation of PN reactor could be achieved successfully by adding 1 mmol/L KClO3 continuously under the conditions of influent NH4+-N of 60 mg/L, nitrogen load of 1.44 kgN/(m3·d), temperature of 20 ℃ and aeration rate of 90 mL/min. The nitrite accumulation rate was as high as 88.72%, and the ratio of NO2--N to NH4+-N in effluent was kept between 1.0 and 1.32, which could meet the influent nitrogen substrate requirements of the anammox reactor. This could be ascribed to that the abundance of AOB-dominant bacteria in biofilm and activated sludge in the main functional area of the PN reactor were 7.70% and 9.60% respectively, while the abundance of NOB-dominant bacteria were 1.07% and 0.79% respectively, leading the ratios of AUR to NUR were 4.52 and 8.61 respectively. After the PN effluent entered the anammox reactor, the nitrogen removal load decreased from 0.85 kgN/(m3·d) to 0.07 kgN/(m3·d), which indicated that the PN effluent with KClO3 addition had a destructive effect on the subsequent anammox reaction. Therefore, KClO3 is not suitable to inhibit NOB in PN/A process.
Last Update:
2024-05-01