SBR实现选择性硝化过程及动力学研究

采用序批式生物反应器(SBR)处理模拟氨氮废水,考察了SBR体系中硝化过程中氮组分和溶解氧变化规律,并对硝化动力学进行了研究.结果表明,在低溶解氧下,体系出现亚硝态氮积累;在序批式反应体系中的硝化反应呈现三阶段,即零级反应段、混合反应段和一级反应段,其硝化特性符合Monod动力学方程;根据SBR实现选择性硝化过程控制方法,实现了SBR选择性亚硝化启动,该体系氨氮出水1 mg·L~(-1),氨氮负荷达0.45 kg·kg~(-1)·d~(-1)(以每kg MLSS中的NH_4~+-N量(kg)计),亚硝态氮累积率达95%左右.

The kinetics of selective nitrification process in a sequencing batch reactor

The changes of nitrogen components and dissolved oxygen (DO) in nitrification process were investigated in a sequencing batch reactor (SBR) treating simulated ammonia wastewater. Besides, the kinetics of nitrification was also studied. The results show that a steady nitrite accumulation could be obtained at a low DO concentration. Moreover, the process of nitrification in the SBR presented three stages: the zero-order reaction period, the mixed-reaction period and the first-order reaction period. The nitrification follows the Monod kinetics equation. In addition, an ammonia concentration lower than 1 mg·L^-1, an ammonia nitrogen loading of 0.45 kgNH⁺₄-N·kgMLSS^-1·d^-1 and 95% oxidation of ammonia to nitrite were achieved in the SBR after the start of shortcut nitrification depending on the implementation of selective nitrification process control.