全程自养脱氮反应器条件下半亚硝化影响因素的探究

目的]研究半亚硝化的快速实现及影响因素.方法]采用全程自养脱氮（CANON）反应器对高氨氮模拟废水进行半亚硝化反应的研究,主要研究了进水NH4＋-N和DO浓度以及pH的变化对半亚硝化反应的影响.结果]控制试验条件在进水NH4＋-N浓度为200 mg/L,pH为7.5 ～8.5,HRT=1.25 d,DO为1.5 mg/L,室温（25～ 27℃）的条件下,连续运行40d,NH4＋-N转化为NO2-N的比率接近57％,NO2--N积累率（即NO2-N/NOx--N）在95％以上,NO2-N与NH4＋-N比值基本稳定在1.06～l.21.结论]CANON反应器实现了半亚硝化反应,为后续Anammox菌的富集和CANON反应器的启动创造了条件.

Research on Influencing Factors of Half-nitrosation in CANON Reactor

Objective ] To study on quickly startup process and influencing factors of half-nitrosation. Method ] The study of half-nitrosation has been accomplished for high ammonia nitrogen simulation wastewater in a reactor of completely autotrophic ammonium removal over nitrite （CANON）. The influences of concentration variations of influent pH, NH4 ＋ -N, and DO to half-nitrosation were analyzed during the experi- ments. Result] Control the experiment under the condition of influent NH4 ＋-N of 200 rag/L, DO of 1.5 rag/L, HRT of 1.25 d, pH value of 7.5 - 8.5, and water temperature of 25 - 27 ~C , the accumulation rate of NO2 - -N（ i. e. , NO2 - -N/NOx - -N） is over 95% , the conversion rate of NH4 ~ -N to NOa - -N is close to 57% and the rate of NO2 - -N to NH4＋ -N steadily keeps 1.06 - 1.21. Conclusion] CANON reactor successfully started the nitrosoflcation reaction, which create good conditions for further enrichment of anammox bacteria and startup of the CANON reactor.