LIZheng-hao,HEHao-lin,NIEJia-le,et al.Optimization of Operational Parameters of Aerobic Granular Sludge for Treating Wastewater with Low Carbon to Nitrogen Ratio[J].China Water & Wastewater,2024,40(15):93-100.
Optimization of Operational Parameters of Aerobic Granular Sludge for Treating Wastewater with Low Carbon to Nitrogen Ratio
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第15期
Page:
93-100
Column:
Date of publication:
2024-08-01
- Keywords:
- aerobic granular sludge; low C/N ratio; sludge concentration; carbon source; alkalinity; seed sludge
- Abstract:
- This paper investigated the nitrogen removal performance of aerobic granular sludge (AGS) for treating the wastewater with low carbon to nitrogen ratio (C/N ratio of 3 and 1). The effects of sludge concentration, carbon source dosage, autotrophic AGS proportion and alkalinity on the removal rate of total inorganic nitrogen (TIN) were explored by single factor experiments, and then the approximate range of each influencing factor was determined. The influence of each factor on TIN removal rate was analyzed by using the response surface method, and the best operating parameters were eventually determined. When the influent C/N ratio was 3, the significant of influencing factors in descending order was as follows: sludge concentration, carbon source dosage, autotrophic AGS proportion and alkalinity, and that was carbon source dosage, sludge concentration, autotrophic AGS proportion and alkalinity when the influent C/N ratio was 1. When the influent C/N ratio was 3, the optimal operating parameters for nitrogen removal were as follows: sludge concentration of 6 260.32 mg/L, alkalinity of 556 mg/L, autotrophic AGS proportion of 39.96% and carbon source dosage of 165.61 mg/L, and the predicted TIN removal rate was 94.61%. According to the carbon source dosage recommended by the German ATV standard (ATV-DVWKA131E), 17.2% of carbon source dosage, 22.1% of alkalinity and 16.7% of energy consumption were saved under the optimal operating conditions in this study. When the influent C/N ratio was 1, the optimal operating parameters were as follows: sludge concentration of 5 172.11 mg/L, alkalinity of 1 166 mg/L, autotrophic AGS proportion of 21.88% and carbon source dosage of 857.43 mg/L, and the predicted TIN removal rate was 56.95%.
Last Update:
2024-08-01