YANG Kai-liang,LIAO De-xiang,MA Yi-ping,et al.Rapid Start-up and Microbial Community Structure of CANON Process[J].China Water & Wastewater,2020,36(23 23):1-7.
Rapid Start-up and Microbial Community Structure of CANON Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
23 23
Page:
1-7
Column:
Date of publication:
2020-12-01
- Keywords:
- completely autotrophic nitrogen removal over nitrite (CANON) process; comet filamentous filter material; rapid start-up; microbial community structure; Candidatus_Jettenia
- Abstract:
- Rapid start-up of a completely autotrophic nitrogen removal over nitrite (CANON) process for the treatment of simulated wastewater was explored in a SBBR. The system was filled with comet filamentous filter material and seeded with conventional activated sludge. Anaerobic ammonia oxidizing bacteria (AnAOB) were enriched successfully in 39 days by adopting the strategy of strict anaerobic enrichment of AnAOB, and the removal efficiency of TN reached 82.3%. Then, ammonia oxidizing bacteria (AOB) were enriched rapidly in 13 days by shortening the HRT, gradually decreasing the concentration ofNO2--N?and controlling DO between 0.1 mg/L and 0.3 mg/L. The CANON process was successfully started up after 78 days, in which the removal efficiencies of NH4+-N and TN were up to 97.3% and 83.3%, respectively, and the TN removal load reached 0.127 kg/(m3·d). High-throughput sequencing showed that the relative abundance of Planctomycetes increased from 1.99% to 56.44%, while Proteobacteria decreased from 65.09% to 13.67%. AOB and AnAOB were Nitrosomonas and Candidatus_Jettenia in the biofilm, and their relative abundance increased from 2.28% and 0 to 3.37% and 41.88%, respectively. The nitrite oxidizing bacteria (NOB) were Nitrospira, with the relative abundance decreasing from 3.27% to 0.27%.
Last Update:
2020-12-01