序批式生物膜反应器常温亚硝化启动试验研究

Start-up experiment of shortcut nitrification in sequencing batch biofilm reactor under room temperature

常温条件下,采用序批式生物膜反应器处理城市生活污水经A/O处理的二级出水,研究曝气量、温度等对亚硝化启动的影响。试验初期反应器自然挂膜,采用高浓度游离氨(FA)和低浓度溶解氧(DO)联合抑制的方法抑制亚硝酸盐氧化菌(NOB)的生长,使氨氧化菌(AOB)成为反应器内的优势菌种。试验结果表明12d即可完成序批式生物膜反应器硝化生物膜的培养和富集,挂膜速度较快;在不影响亚硝化反应的前提下,低浓度DO可以有效抑制NOB的生长,有利于AOB成为反应器内优势菌种,且不影响进水氨氮转化率;低氨氮浓度条件下,较低的温度对AOB的活性有抑制作用,而缩短曝气时间并不能稳定提高亚硝酸盐氮的积累率。

Under room temperature, for learning the effects of aeration and temperature on start-up of shortcut nitrification, secondary effluent which is got from domestic wastewater after A./O process is treated in a sequencing batch biofilm reactor（ SBBR）. In the initial experiment, the SBBR is filmed naturally, and then nitrite oxidizing bacteria（NOB） are restrained by keeping high concentration of FA and low concentration of DO in order to make ammonia oxidizing bacteria（AOB） be the dominant bacterium. The tested results prove that the nitration biofilm in SBBR is cultivated and enriched successfully in 12 days, it is fast to get film. On the assumption that shortcut nitrification is not impacted, NOB could be restrained effectively in low concentration of DO, it is favorable for AOB to be the superior bacterium in the reactor and ammonia nitrogen transformation of influent is not impacted. On the condition of low concentration of ammonia nitrogen, lower temperature restrains the activity of AOB, and nitrite accumulation rate could not increase steadily by shortening the aeration time.