Zhang Jie, Lao Hui-Mei, Li Dong, Wei Zi-Qing
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2020 Nov 8;41(11):5097-5105. doi: 10.13227/j.hjkx.202003118.
A continuous flow reactor was inoculated at 25-28℃ with mature partial nitrification granular sludge. In order to avoid the granular sludge being crushed because of the sludge backflow through the peristaltic pump, a built-in sedimentation zone was used for internal backflow. The experiment investigated the influence of the different anaerobic time to aeration time ratio (1:1, 2:1, and 1:2) on the stability of a continuous-flow partial nitrification granular sludge system. The results showed that when the controlled anaerobic time to aeration time ratio was 1:1 and 2:1, the partial nitrification performance was good and the nitrite accumulation rates were 85.2% and 94.5%, respectively. When the controlled anaerobic time to aeration time ratio was 1:2, the partial nitrification performance gradually deteriorated, and the ammonia nitrogen removal rate and nitrite accumulation rate at the end of the stage decreased to 64.1% and 58.7%, respectively. Batch test results showed that intermittent aeration and continuous aeration can better inhibit the relative activity of NOB in the partial nitrification system to a certain extent. The longer the anaerobic time, the better the NOB activity inhibition. However, too long an anaerobic time will also lead to ammonia nitrogen removal rate. In the process of partial nitrification, the long-term stable operation of continuous flow partial nitrification process can be realized by 1:1 and coordinated control of other control conditions. An analysis of sludge performance indicated that in the anaerobic time to aeration time ratio range of 1:1-1:2, the longer the anaerobic time, the more stable the granular sludge structure. The shorter the anaerobic time, the smaller the selection pressure in the reactor, resulting in poor sludge sedimentation performance and partial disintegration of partial nitrification granular sludge. An EPS chemical analysis and a three-dimensional fluorescence spectroscopic analysis showed that the PN content was higher and the PN/PS value was higher when the anaerobic time and aeration time ratio was 2:1.
在25 - 28℃下，向连续流反应器中接种成熟的部分硝化颗粒污泥。为避免颗粒污泥因蠕动泵回流污泥而被破碎，采用内置沉淀区进行内部回流。该实验研究了不同厌氧时间与曝气时间比（1:1、2:1和1:2）对连续流部分硝化颗粒污泥系统稳定性的影响。结果表明，当控制的厌氧时间与曝气时间比为1:1和2:1时，部分硝化性能良好，亚硝酸盐积累率分别为85.2%和94.5%。当控制的厌氧时间与曝气时间比为1:2时，部分硝化性能逐渐恶化，该阶段末期氨氮去除率和亚硝酸盐积累率分别降至64.1%和58.7%。批次试验结果表明，间歇曝气和连续曝气在一定程度上能更好地抑制部分硝化系统中NOB的相对活性。厌氧时间越长，对NOB活性的抑制效果越好。然而，厌氧时间过长也会导致氨氮去除率下降。在部分硝化过程中，通过1:1以及其他控制条件的协调控制，可实现连续流部分硝化过程的长期稳定运行。污泥性能分析表明，在厌氧时间与曝气时间比为1:1 - 1:2的范围内，厌氧时间越长，颗粒污泥结构越稳定。厌氧时间越短，反应器内的选择压力越小，导致污泥沉降性能变差，部分硝化颗粒污泥出现部分解体。EPS化学分析和三维荧光光谱分析表明，当厌氧时间与曝气时间比为2:1时，PN含量较高且PN/PS值较高。
