缺氧反应时间对反硝化除磷系统脱氮除磷效果的影响

反硝化除磷工艺具有节省碳源、曝气量以及污泥产量低等优点,因而在处理城市生活污水中具有显著优势。反硝化除磷效能主要在缺氧阶段完成。缺氧时间直接影响系统的脱氮除磷效率。本实验以SBR反应器在厌氧/缺氧/好氧条件下富含的反硝化聚磷菌(DPAOs)为研究对象,通过调节不同的缺氧反应时间(150 min,210 min和270 min),考察缺氧反应时间冲击对下一周期代谢的影响和长期对整个反硝化除磷系统的影响。冲击实验发现:缺氧时间的改变基本不影响下一周期挥发性脂肪酸(VFAs)的吸收以及硝氮去除。在长期缺氧反应时间不同的系统中,当缺氧时间分别为150 min、210 min和270 min时,除磷效率分别是-10.4%、62.5%、73.6%,脱氮率均达到100%。当缺氧反应时间从150 min延长到270 min时,微生物体内聚羟基脂肪酸酯(PHAs)水平和聚磷(poly-P)水平以及释磷量都升高。实验表明,缺氧时间的适当延长利于提高除磷效率。

Impact of Anoxic Reaction Time on Denitrifying Phosphorus Removal Performance

Denitrifying phosphorus removal systems have the superiority of low carbon requirements of sewage,low aeration and low sludge production and so on,with significant performance advantages in treating municipal sewage with low ratio of C/N over other water treatment processes.The effect of denitrifying phosphorus removal process mainly completed in anoxic phase,so the reaction time directly determined the efficiency of denitrification and phosphorus removal.In order to learn impacts of anoxic reaction time on denitrifying phosphorus removal performance,and further effects of anoxic reaction time on denitrifying phosphorus metabolism in next period,experiments with different anoxic reaction time （150,210 and 270 rain） were conducted in an anaerobic/anoxic/aerobic sequencing batch reactor （SBR）.In shock experiment,change of anoxic reaction time has little impact on VFAs absorb and N removal in next cycle.In long running systems,P removal efficiency was-10.4％,62.5％ and 73.6％ when anoxic reaction time was 150 min,210 min and 270 min,respectively.Nitrogen removal was 100％ in three systems.When the anoxic reaction time lengthened from 150 min to 270 min,the content of PHAs and poly-P in microorganism and P release during anaerobic phase increased.The result showed that lengthening anoxic reaction time properly could improve N and P removal efficiency.