生物紊动床内短程硝化过程研究

采用生物紊动床反应器(BTBR),分别研究了氨氮浓度、溶解氧浓度和有机物浓度对硝化过程的影响,以及不同条件下短程硝化的实现方法及特点。试验结果表明,通过高浓度游离氨对硝化菌选择性抑制所获得的亚硝酸盐积累是不稳定的;在0.5￣1.0mg/L溶解氧下,DO成为增殖的限制基质,可实现亚硝酸盐稳定的积累;当进水NH+4-N为300mg/L时,出水硝态氮中亚硝酸盐氮比例稳定在80%以上。在DO浓度为2￣3mg/L的条件下,有机物浓度为200m gTOC/L时对硝化作用影响不大;DO浓度为0.5￣1.0mg/L、TOC为100mg/L时硝化系统即受到破坏。

Short-cut Nitrification in a Biological Turbulent Bed Reactor

The effect of ammonium concentration, dissolved oxygen (DO) concentration and organic matter concentration was studied in a biological turbulent bed reactor, and the method and characteristic of short-cut nitrification was discussed. The experiment results showed nitrite accumulation was unstable by high FA inhibition, while DO concentration was 0.5~1.0 mg/L and influent NH4--N was 300 mg/L, nitrite accumulation rate (NH2--N /(NH2--N + NH3--N)) was stably above 80%. Under the condition of DO 2~3 mg/L and TOC 200 mg/L, organic matter has less impact on nitrification while the nitrification system would be destroyed with DO of 0.5~1.0 mg/L and TOC over 100 mg/L.