游离氨对晚期垃圾渗滤液短程硝化影响

Effects of Free Ammonia on Partial Nitrification of Old Leachate

利用SBR反应器,探讨了不同溶解氧(DO)浓度和污泥浓度条件下,游离氨(FA)对晚期垃圾渗滤短程硝化过程的影响．试验结果发现,当DO浓度从0．5 mg/L增加到0．75 mg/L时,最大氨氧化速率有较大的增加,且较高的亚硝酸菌活性可以减弱FA对其的抑制作用,FA对硝酸菌的抑制浓度约为4．2～8．1mg/L;限制DO实现短程硝化比控制FA更为稳定;污泥浓度也是短程硝化的重要影响因素之一,当DO浓度控制在0．75 mg/L时,较佳的污泥浓度约为6800～8100 mg/L．此时亚硝酸菌活性较强,且由于FA在污泥絮体内的扩散限制,亚硝酸菌可“适应”更高的FA浓度．图5,表2,参10．

Through employing sequencing batch reactor, the effects of free ammonia（FA） on partial nitrification were investigated in different dissolved oxygen（DO） and mixed liquor suspended solids（MISS） concentration. Results show that the maximum ammonia oxidation velocity increase rapidly if DO concentration is improved from 0.5 mg/L to 0.75 mg/L, and more active nitrosomonas reduce inhibition of FA, at same time, concentration of 4.2-8.1 mg NH3 /L inhibit nitrobactor. Partial nitrification was more achieved in low DO concentration than high FA concentration. It conclud that MISS concentration is a important fact of getting partial nitrification. It is suitable to set MISS concentration between 6800 mg/L to 8100 mg/L, under these conditions, nitrosomonas is more active, which make nitrosomans to be adapted to higher FA concentration for it diffusing in sluge.Sfigs., 2tabs., 10refs.