实时控制序批式膜生物反应器处理养猪废水的短程硝化

发布时间：2018-05-02 09:17

本文选题：SMBR + 实时控制　；参考：《环境工程学报》2017年11期

【摘要】：采用实时控制序批式膜生物反应器(sequencing batch membrane bioreactor,SMBR)工艺处理某种猪场的养殖粪尿污水,通过pH实时曲线上的"氨谷点"对曝气时间进行实时控制实现短程硝化。小试反应器10个月的连续运行结果表明,利用曝气时间实时控制实现了稳定的亚硝态氮累积。短程硝化启动后,SMBR对COD和TN的平均去除率分别达到95.5%和92.4%,亚硝态氮积累率可维持在85%以上。高通量测序与OTU分类的结果表明,实时控制下SMBR内NOB逐渐被淘洗,而AOB得到了富集。从反应器启动初期到获得稳定短程硝化(反应器运行200 d),AOB丰度提高了55倍,而对应的NOB丰度降低了2倍。此外,AOB的绝对数量与DO呈显著负相关(r=-0.846,0.01p0.05),而与出水NH+4-N浓度呈显著正相关(r=0.45,0.01p0.05),表明较低的DO及NH+4-N的积累有利于AOB的富集。因此,利用曝气时间实时控制实现短程硝化是一种面向群落结构优化的控制方法,有利于短程硝化系统长期稳定的运行,具有实际应用价值和工程意义。
[Abstract]:A real-time sequencing batch membrane bioreactor (SMBR) process was used to treat the fecal and urine wastewater from a pig farm. The aeration time was real-time controlled by the "ammonia valley point" on the pH real-time curve to realize short-cut nitrification. The continuous operation of the reactor for 10 months showed that stable nitrite nitrogen accumulation was realized by real time control of aeration time. The average removal rates of COD and TN were 95.5% and 92.4%, respectively, and the accumulation rate of nitrite nitrogen was more than 85%. The results of high throughput sequencing and OTU classification showed that NOB in SMBR was washed out gradually and AOB was enriched under real time control. From the initial stage of the reactor to the stable short-cut nitrification, the NOB abundance of the reactor increased by 55 times and the corresponding NOB abundance decreased by 2 times. In addition, there was a significant negative correlation between the absolute number of AOB and do, and a significant negative correlation between the absolute amount of AOB and do, and a significant positive correlation between the absolute amount of AOB and the concentration of NH _ 4-N in effluent, which indicated that the accumulation of do and NH _ 4-N was beneficial to the enrichment of AOB. Therefore, using aeration time real-time control to realize short-cut nitrification is a control method oriented to community structure optimization, which is beneficial to the long-term stable operation of short-cut nitrification system, and has practical application value and engineering significance.
【作者单位】：中国科学院生态环境研究中心;中国科学院大学;
【基金】：国家自然科学基金资助项目(21577161,41501513)
【分类号】：X713

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