SBR工艺实现长期稳定的部分短程硝化

发布时间：2019-01-28 22:54

【摘要】：采用SBR工艺以实际生活污水为研究对象,通过3组预实验得出实现部分短程硝化(部分4NH-N+转化为NO_2~-N-)的最佳曝气量和曝气时间,启动长期运行的部分短程硝化序批式反应器(PNSBR),在好氧阶段以最佳曝气量[7.2~12 L·(h·L)~(-1)]和曝气时间(2~3 h)曝气,持续运行110多天(450多个周期)。结果显示,出水亚硝态氮积累率稳定维持在94%~100%,表明了长期稳定的短程硝化效果;出水2NO-N-与4NH-N+的比值大部分集中在2~4之间。进一步的分析得出,在PNSBR长期运行中,一方面通过控制曝气量和曝气时间使得好氧阶段溶解氧较低,更利于AOB的生长代谢而抑制NOB的活性;另一方面排水后剩余的亚硝态氮通过利用进水中的碳源反硝化去除(本周期的内源反硝化和下周期的外源反硝化),避免了为NOB提供底物的可能,从而实现了稳定的部分短程硝化。同步厌氧氨氧化和反硝化(SAD)工艺广泛存在,PNSBR反应器作为SAD的前置反应器,可提供满足SAD运行的进水,因此部分短程硝化是一项有潜力的工艺。
[Abstract]:The optimum aeration rate and aeration time of partial short-cut nitrification (part of 4NH-N to NO_2~-N-) were obtained by using SBR process and three groups of pre-experiments. The partial short-cut nitrification sequencing batch reactor (PNSBR), which has been running for a long time, is aerated with the optimum aeration rate [7.2 ~ 12 L (h L) ~ (-1)] and aeration time (2 ~ 3 h) in aerobic stage. Run continuously for more than 110 days (more than 450 cycles). The results showed that the accumulation rate of nitrite nitrogen in effluent was maintained at 94 ~ 100, indicating a long-term stable short-cut nitrification effect, and the ratio of 2NO-N- to 4NH-N in effluent was mostly concentrated in the range of 2n4. Further analysis shows that in the long-term operation of PNSBR, on the one hand, by controlling the amount of aeration and aeration time, the dissolved oxygen in aerobic stage is lower, which is more conducive to the growth and metabolism of AOB and inhibits the activity of NOB; On the other hand, the residual nitrite nitrogen after drainage can be removed by using carbon source denitrification (endogenous denitrification in the current cycle and exogenous denitrification in the next cycle), thus avoiding the possibility of providing substrates for NOB. Thus, stable partial short-cut nitrification is realized. Simultaneous anaerobic ammoxidation and denitrification of (SAD) processes are widespread. As a prereactor of SAD, PNSBR reactor can provide influent to meet the requirements of SAD operation, so partial short-cut nitrification is a potential process.
【作者单位】：北京工业大学北京市污水脱氮除磷处理与过程控制工程技术研究中心北京市水质科学与水环境恢复工程重点实验室;
【基金】：国家自然科学基金项目(51478013) 北京市教委资助项目~~
【分类号】：X799.3

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