XIAQiong-qiong,SHANGWei,ZHENGXing-can,et al.Effect of Aeration Mode on CANON Process Treating Low Ammonia Nitrogen Wastewater[J].China Water & Wastewater,2022,38(17):67-73.
Effect of Aeration Mode on CANON Process Treating Low Ammonia Nitrogen Wastewater
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第17期
Page:
67-73
Column:
Date of publication:
2022-09-01
- Keywords:
- CANON; suspended carrier; intermittent aeration; nitrogen removal
- Abstract:
- It is difficult to inhibit nitrite oxidizing bacteria (NOB) in anaerobic ammonia oxidation processes for low ammonia nitrogen wastewater treatment. The short-term effects of intermittent aeration on autotrophic denitrification for simulated low ammonia nitrogen wastewater treatment were investigated in a continuous flow one-stage completely autotrophic nitrogen removal over nitrite (CANON) reactor packed with suspended carrier, and the distribution characteristics of microorganisms in the reactor were analyzed. When the influent NH4+-N was 40-50 mg/L, the cyclic aeration mode with on/off of 20 min/20 min was adopted, and the dissolved oxygen (DO) at the end of aeration was controlled at 1.0-1.3 mg/L, the TN and NH4+-N in effluent were 7.8-14.4 mg/L and 1.2-5.9 mg/L, respectively. Intermittent aeration inhibited the activity of NOB and increased the conversion of NH4+-N, thus improving the denitrification performance of the system.High-throughput 16S rDNA metagenomic sequencing showed that Proteobacteria, Planctomycetes and Nitrospirae were the main denitrification bacteria in biofilm samples from the reactor. Intermittent aeration completely inhibited g_Nitrospira genus belonged to NOB. Candidatus_Kuenenia was more adaptable to survive in low ammonia nitrogen wastewater.
Last Update:
2022-09-01