ZHENGXiao-ying,XUZhi,ZHANGYuan,et al.Effect of Cerium Oxide Nanoparticles on Aerobic Granulation Process[J].China Water & Wastewater,2022,38(No.3):21-28.
Effect of Cerium Oxide Nanoparticles on Aerobic Granulation Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
No.第3
Page:
21-28
Column:
Date of publication:
2022-02-01
- Keywords:
- cerium oxide nanoparticles (CeO2 NPs); sequencing batch reactor; aerobic granular sludge; granulation; nitrogen and phosphorus removal
- Abstract:
- Effects of different concentrations of cerium oxide nanoparticles (CeO2 NPs) on aerobic granulation were investigated in a sequencing batch reactor (SBR). Aerobic granular sludge appeared in the three reactors (R0, R1 and R2 with CeO2 NPs concentrations of 0 mg/L, 1 mg/L and 5 mg/L) after 28 d, 24 d and 21 d, respectively. Although CeO2 NPs stimulated the secretion of extracellular polymer substrate (EPS) in a short time and promoted the formation of granules, the toxicity of nano?material inhibited the growth of microorganisms, resulting in loose granular structure and high water content of sludge. As a result, the granular sludge eventually stabilized after 40 d, 46 d and 56 d, respectively. When the mature aerobic granular sludge was exposed to CeO2 NPs with concentrations of 1 mg/L and 5 mg/L, the nitrogen and phosphorus removal efficiency were greatly affected. The total nitrogen removal efficiency of R1 and R2 was 5.96% and 11.49% lower than that of R0, and the total phosphorus removal efficiency of R1 and R2 was 16.79% and 23.59% lower than that of R0, respectively. When the dosage of CeO2 NPs was 5 mg/L, the relative abundance of the denitrifying bacteria Thermomonas and Flavobacterium decreased from 2.16% and 1.88% in the blank group to 1.55% and 1.27% respectively, and the relative abundance of Burkholderia and Acinetobacter decreased from 15.86% and 9.33% in R0 to 10.63% and 5.97%, respectively, indicating that the denitrification and phosphorus accumulation processes of granular sludge were inhibited.
Last Update:
2022-02-01