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.
曝气方式对低基质CANON工艺的影响
- Title:
- Effect of Aeration Mode on CANON Process Treating Low Ammonia Nitrogen Wastewater
- Keywords:
- CANON; suspended carrier; intermittent aeration; nitrogen removal
- 摘要:
- 针对低浓度条件下厌氧氨氧化工艺难以实现对亚硝酸盐氧化菌（NOB）的抑制，采用连续流悬浮载体一段式全程自养脱氮工艺（CANON），以人工模拟废水为进水，考察了间歇曝气对低氨氮浓度条件下自养脱氮的短期影响，同时分析了反应器内微生物的分布特征。结果表明，当进水NH4+-N浓度为40~50 mg/L时，采用曝气20 min、停止曝气20 min的循环曝气模式，曝气末期溶解氧（DO）浓度控制在1.0~1.3 mg/L，则出水TN、NH4+-N浓度分别为7.8~14.4和1.2~5.9 mg/L；间歇曝气在抑制NOB活性的同时，提高了NH4+-N的转化率，从而提高了系统的脱氮性能。对填料生物膜样品进行16S rDNA宏基因组高通量测序，发现反应器内脱氮细菌主要为Proteobacteria、Planctomycetes和Nitrospirae；间歇曝气时，NOB所在的g_Nitrospira菌属被较为彻底地抑制；Candidatus_Kuenenia对低浓度废水的适应性较强。
- 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.
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