| 停曝时间比对亚硝化颗粒污泥形成的影响 |
| 摘要点击 3271 全文点击 1034 投稿时间：2017-10-12 修订日期：2017-10-29 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 SBR 停曝时间比 亚硝化颗粒污泥 亚硝化率 胞外聚合物 |
| 英文关键词 SBR anaerobic time and aeration time ratio partial nitrification granular nitrosation rate EPS |
|
| 中文摘要 |
| 室温下（22~28℃），采用R1、R2、R3三组相同的SBR反应器接种MLSS、SVI值分别为3500 mg·L-1、162 mL·g-1的具有良好亚硝化性能的絮状活性污泥，研究了不同停曝时间比（1∶2、1∶1、2∶1）对亚硝化颗粒污泥形成的影响.实验表明，R1、R2和R3分别于103、82、64 d实现了亚硝化污泥的颗粒化，运转至85 d时，亚硝化率分别可达86%、98%、96%，R1、R2和R3的SVI值降低至89、75、58 mL·g-1，MLSS增加至2314、2781、2946 mg·L-1.结果表明，在停曝时间比为1∶2~2∶1的范围内，停曝时间比越大，越有利于污泥颗粒化；停曝时间比为1∶2时，由于无法抑制NOB，反应器中污泥亚硝化性能下降，且污泥的沉降性能先变好后变差，在停曝时间比为1∶1~2∶1范围内，停曝时间比越大，污泥的沉降性越好，同时可以保持系统良好的亚硝化性能.另外，停曝时间比越大，微生物分泌的PN、PS越多，且在亚硝化颗粒形成阶段，厌氧末的PN小于好氧末PN，亚硝化颗粒成熟阶段厌氧末的PN大于好氧末PN，而在运行期间，厌氧末的PS一直大于好氧末PS. |
| 英文摘要 |
| Flocculent sludge with good nitritation performance and MLSS and SVI values of 3500 mg ·L-1 and 162 mL ·g-1, respectively, was inoculated in the R1, R2, and R3 groups of the same SBR reactors at room temperature (22-28℃). The effects of different anaerobic time and aeration time ratios (1:2, 1:1, and 2:1) on the formation of partial nitrification granular sludge were studied. The results showed that granules in three reactors were successfully formed at 103 d, 82 d, and 64 d. The nitrosation rate of R1, R2, and R3 were 86%, 98%, and 96%, respectively, and SVI decreased to 89, 75, and 58 mL ·g-1 and MLSS increased to 2314, 2781, and 2946 mg ·L-1, respectively, at the 85 d. The larger ratio of anaerobic time and aeration time was more conducive to sludge granulation, better settling, and nitritation performance. When the anaerobic time and aeration time ratio was 1:2, the nitritation performance of the sludge decreased since the NOB could not be suppressed, and the settling performance of the sludge became better and then worse. In addition, at the larger ratio of anaerobic time and aeration time, there was more PN and PS from microbial secretion. The PN of R1, R2, and R3 was smaller at the end of the anaerobic phase compared to that of the aerobic phase in the early stage of granular formation, but were reversed in the stabilization stage. The PS of the anaerobic phase was larger than that of the aerobic stage over the entire process. |
|
|
|
