不同曝气强度下SBR污染物去除性能研究

Study on The Pollutant Removal Performance of SBR under Different Aeration Intensities

采用6组柱状序批式反应器(SBR),考察了不同曝气强度(Q=40,80,100,120,140,160 L/h)对活性污泥降解污染物(COD和氨氮)能力的影响。在此基础上,利用SOUR活性指标和溶解氧渗透深度,阐述曝气强度对活性污泥污染物去除能力的影响机制。结果表明,随着运行时间的增加,各活性污泥系统去除COD和氨氮的能力逐渐提升并到达稳定。稳定期,随着曝气强度的增加,COD及氨氮去除效率先升高后降低,在曝气强度为100 L/h时,COD及氨氮的平均去除率最高,分别为95.6%和95.86%。稳定期污泥活性同样随曝气强度变化而先增高后降低,Q为100 L/h时污泥活性最强,SOUR值为46.0 mg/(g·h),而Q为160 L/h时活性最低,SOUR仅25.1 mg/(g·h);缺氧区域占比先增加后减少,R3时最高,体积分数为68.45%;在此实验条件下,当曝气强度为100 L/h时,为污泥系统提供了最佳的反应条件。

The effect of different aeration intensity （Q = 40,80,100,120,140,160 I/h） on the pollutants （COD and ammonia nitrogen） removal ability of activated sludge was investigated by using six sets of column sequencing batch reactor （SBR）.The influence mechanism of hydrodynamic conditions on the pollutants removal ability was described by using the SOUR activity and the dissolved oxygen penetration depth.The results showed that with the increase of running time, the ability of the activated sludge system to removal COD and ammonia nitrogen increased gradually and reached the stability. In the stable phase, with the increase of aeration rate, the removal efficiency of COD and ammonia nitrogen first increased and then decreased, while the average removal rate of COD and ammonia nitrogen was the highest at 95.6% and 95.86% respectively, when the aeration rate was 100 L/h. In the stable stage, the activated sludge activity also increased first and then decreased with the increase of aeration intensity. R3（Q = 100 L/h） bad the strongest activity, and the SOUR was 46.0 mg/（g·h）, while R6 （Q = 160 L/h） activity was the lowest, SOUR was only 25.1 mg/（g·h）.And the proportion of anoxic area increased at first and then decreased, while R3 was the highest, 68.45%. Under the experimental conditions, when the aeration rate is 100 L/h, the sludge system has the optimal reaction conditions.