高氨浓度下生物流化床内亚硝化过程的选择特性研究

Study on the selection process of nitrification in biological fluidized bed under high concentration of ammonia

对于高氨低碳废水生物处理 ,短程硝化——反硝化生物脱氮工艺是一条颇具吸引力的途径 .本文采用下向流内循环生物流化床反应器 ,在高浓度氨条件下 ,探讨了亚硝化过程的稳定性 .试验结果表明 :在系统运行初期 ,由于硝酸菌对环境的适应性和生长的滞后性 ,暂时出现亚硝酸积累 ,但伴随硝酸菌适应与繁殖 ,亚硝酸被完全氧化 .高浓度游离氨对硝酸菌氧化速率有抑制作用 ,而对亚硝酸菌抑制不明显 ,也造成亚硝酸积累 ,但这种对硝化菌选择性抑制所获得的亚硝酸积累是不稳定的 。

Shortcut nitrification denitrification is an attractive way for treatment of wastewater sufficient in nitrogen and deficient in organic carbon. A down flow biological fluidized bed reactor (DBFB) was used to discuss the stability of nitrification through nitrite under high concentration of ammonia . The experiment results showed that at the beginning of operation ,nitrite accumulation occurred due to adaptation to environment and growth lag of nitrobacteria . But after the bacteria accumulation and proliferation, nitrite was mostly oxidized to nitrate. That high concentration of ammonia inhibited oxidize rate of nitrobacteria more than that of nitrosomonas resulted in nitrite accumulation that was not stable because of the accumulation of the nitrobacteria to FA and the inhibition was irreversible after accumulation to nitrobacteria.