[1]季飞,边永欢,赵峰,等.不同上升流速提升对反硝化颗粒污泥反应器的影响[J].中国给水排水,2022,38(23):7-16.
JIFei,BIANYong-huan,ZHAOFeng,et al.Effect of Different Upflow Velocity Promotion Strategy on the Performance of Denitrifiying Granular Sludge Reactor[J].China Water & Wastewater,2022,38(23):7-16.
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JIFei,BIANYong-huan,ZHAOFeng,et al.Effect of Different Upflow Velocity Promotion Strategy on the Performance of Denitrifiying Granular Sludge Reactor[J].China Water & Wastewater,2022,38(23):7-16.
不同上升流速提升对反硝化颗粒污泥反应器的影响
中国给水排水[ISSN:1000-4062/CN:12-1073/TU]
卷:
第38卷
期数:
2022年第23期
页码:
7-16
栏目:
出版日期:
2022-12-01
- Title:
- Effect of Different Upflow Velocity Promotion Strategy on the Performance of Denitrifiying Granular Sludge Reactor
- Keywords:
- upflow velocity; denitrification granular sludge; extracellular polymeric substance; microbial community
- 摘要:
- 为了探究上升流速的不同变化幅度对反硝化颗粒污泥反应器的影响，分别构建了快速提升反应器（以大幅度提升上升流速，记作RH）和慢速提升反应器（以小幅度提升上升流速，记作RL），考察不同上升流速提升策略对反应器性能、反硝化颗粒污泥特性及菌群的影响。结果表明，在RH和RL的上升流速由0.25 m/h提升至0.41 m/h的过程中，NO3--N和COD平均去除率均在92%以上，NO2--N平均积累量为1.5 mg/L左右；当两反应器上升流速进一步提升至0.49 m/h时，RH反应器污泥发生流失，COD去除率在运行的前5 d下降为73.1%左右，NO2--N平均积累量达到16.3 mg/L，粒径<1.4 mm的颗粒占比从34%上升为51.8%；而RL的NO3--N和COD平均去除率和NO2--N平均积累量均变化较小。同时，两反应器颗粒污泥的紧密结合型胞外聚合物（TB-EPS）在此阶段出现不同的变化趋势，其中RL中污泥TB-EPS含量从（32.4±0.8） mg/g增加为（56.2±0.4） mg/g，而RH从（47.1±0.8） mg/g下降为（28.9±0.9） mg/g，表明TB-EPS对于反硝化颗粒污泥维持较为稳定的结构起到了重要作用。高通量测序显示，门水平上利于反硝化的Firmicutes和Planctomycetes在RL反应器中得到富集，而在RH反应器中均出现下降；属水平上主要参与反硝化的Hyphomicrobium占比在RH中明显下降，造成了两反应器反硝化性能稳定性的差异。因此，在所考察的上升流速范围内，RL的上升流速提升策略更有利于反硝化颗粒污泥承受较高的上升流速，并保持反应器的稳定运行。
- Abstract:
- In order to explore the influence of different upflow velocity amplitudes on the denitrification granular sludge (DGS) reactor, both rapid rise reactor (increasing the upflow velocity with a high rate, denoted as RH) and slow rise reactor (increasing the upflow velocity with a low rate, denoted as RL) was constructed. The impact of different upflow velocity promotion strategies on the performance of the reactor was investigated, and the characteristics of the DGS and the bacterial flora was analyzed. The results showed that when the upflow velocity of the RH and RL reactors was increased from 0.25 m/h to 0.41 m/h, the average removal rates of NO3--N and COD were over 92%, the average accumulation of NO2--N was about 1.5 mg/L; when the upflow velocity of the RH and RL reactors was further increased to 0.49 m/h, the sludge in RH ran off, the COD removal rate dropped to about 73.1% in the first 5 days of operation, the average accumulation of NO2--N reached 16.3 mg/L, and the diameter of particles less than 1.4 mm increased from 34% to 51.8%; the average removal rate of NO3--N and COD and the average accumulation of NO2--N in the RL had little change. Meanwhile, the TB-EPS of granular sludge in the two reactors had different variation trend at this stage, the TB-EPS content of the sludge in the RL reactor increased from (32.4±0.8) mg/g to (56.2±0.4) mg/g, while that in RH decreased from (47.1±0.8) mg/g to (28.9±0.9) mg/g. TB?EPS played an important role in maintaining a relatively stable structure of DGS. High-throughput sequencing showed that Firmicutes and Planctomycetes, which were conducive to denitrification at the phylum level, were enriched in the RL reactor, but decreased in the RH reactor; the proportion of Hyphomicrobium, which was mainly involved in denitrification at the genus level, decreased significantly in the RH. The different variation of the microbial community in the two reactors caused the difference in the stability of the denitrification performance. Therefore, within the range of upflow velocity investigated in this study, the upflow velocity increase strategy of the RL is more conducive to the denitrification granular sludge withstanding higher upflow velocity and maintaining the stable operation of the reactor.
相似文献/References:
[1]刘云洲,刘洁涛,宫徽.反硝化厌氧颗粒污泥技术处理光伏废水[J].中国给水排水,2022,38(10):166.
LIUYun-zhou,LIUJie-tao,GONGHui.Treatment of Photovoltaic Wastewater by Denitrification Anaerobic Granular Sludge[J].China Water & Wastewater,2022,38(23):166.
更新日期/Last Update:
2022-12-01