高基质浓度下厌氧氨氧化反应器的启动过程

采用3套厌氧序批式生物膜反应器,研究了高基质浓度对厌氧氨氧化反应器启动过程的影响。经过50 d左右培养,3个反应器氮容积去除负荷均达到0.23 kg N/(m3.d)。但是随着氮容积负荷的提高,反应器内pH也随之升高,最终超过了厌氧氨氧化菌最适生长条件,3个反应器脱氮效果逐渐下降。然后分别通过降低浓度、延长水力停留时间的方式对其脱氮效能进行恢复性研究。结果表明高基质浓度不利于厌氧氨氧化反应器脱氮能力的增强。采用低基质浓度的方式提高反应器氮容积去除负荷时,脱氮效能不仅得到了恢复,而且能够提高到0.45 kg N/(m3.d)。说明低基质难度比高基质浓度更有利于厌氧氨氧化脱氮效能的提高。

Process of start-up of ANAMMOX reactors at high substrate concentrations

The process of start-up of ANAMMOX was investigated at high substrate concentrations in three sets of aerobic sequent biofilm reactor (ASBR). Through the 50th day of start-up, the removal rate of volumetric loading rate of total nitrogen achieved 0.23 kg N/(m³·d) in each reactor. Due to the improvement of the loading rate, the pH in the reactor increased, which was over the ANAMMOX bacteria optimum growing conditions, nitrogen removal rate of three reactors gradually decreased. Then recovered the performance of nitrogen removal rate by decreasing the substrate concentration and prolonging the hydraulic retention time. The results showed that the high substrate concentration made against enhancing the ANAMMOX nitrogen removal efficiency. Low substrate concentration in influent in favor of better nitrogen removal effect and the removal rate of volumetric loading rate of total nitrogen achieved 0.45 kg N/(m³·d).It showed that the low influent substrate was in favour of improving the nitrogen removal compared to the higher influent substrate concentration.