XU Hao,LI Jie,LUO Fan,et al.Effect of Different C/N Ratios on Partial Nitrification of Low Ammonia Nitrogen Wastewater[J].China Water & Wastewater,2021,37(11 11):24-27.
Effect of Different C/N Ratios on Partial Nitrification of Low Ammonia Nitrogen Wastewater
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
11 11
Page:
24-27
Column:
Date of publication:
2021-06-01
- Keywords:
- low ammonia nitrogen wastewater; partial nitrification; carbon source; C/N ratio; ammoniaoxidizing bacteria (AOB)
- Abstract:
- To investigate the effect of carbon source on partial nitrification, a stable partial nitrification system was successfully established in a sequencing batch reactor (SBR) with water temperature of (30±1) ℃, pH of 7.8-8.2 and DO of 0.5-1.0 mg/L, effects of different C/N ratios on the partial nitrification system were explored, and the variation of microbial species in the partial nitrification system under different conditions were quantitatively analyzed. Increasing COD in the raw water would lead to a more obvious impact on the partial nitrification performance, and ammonia nitrogen removal efficiency and nitrite accumulation rate showed decreasing trends. When C/N ratio of the raw water was no more than 1.0, it had no obvious impact on the partial nitrification system. However, the removal rates of ammonia nitrogen were only 82.8% and 71.58%, and the ratio of AOB/NOB decreased from 38.1 ∶1 to 11.5 ∶1 when C/N ratio of the raw water was increased to 2.0 and 3.0, indicating that the partial nitrification process was severely affected and tended to collapse. The increase of carbon source concentration gradually inhibited the stable operation of the partial nitrification system, so the C/N ratio should be controlled no more than 1.0 in actual operation.
Last Update:
2021-06-01