| 高频曝停下停曝时间对亚硝化颗粒污泥性能的影响 |
| 摘要点击 1359 全文点击 417 投稿时间：2019-07-16 修订日期：2019-08-03 |
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| 中文关键词 间歇曝气 亚硝酸盐积累率 亚硝化颗粒污泥 停曝时间 PN/PS |
| 英文关键词 intermittent aeration nitrite accumulation rate nitrosated granular sludge on/off aeration time PN/PS |
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| 中文摘要 |
| 间歇曝气中停曝时间对于NOB的抑制是积累亚硝酸盐的关键，为探究曝气频次相同、停曝时间组合不同亚硝化颗粒污泥的稳定运行，在25~28℃，接种好氧颗粒污泥于SBR（R0）反应器中，通过间歇曝气与DO限制驯化为亚硝化颗粒污泥，采用3组规格相同的SBR反应器（R1、R2和R3）分析停曝时间组合（3 min：3 min、4 min：2 min和2 min：4 min）对亚硝化颗粒污泥性能的影响.实验表明，R1、R2亚硝酸盐积累率较高，平均亚硝酸盐积累率分别为89%和95%，R3亚硝化性能较差，运行周期末期亚硝酸盐积累率仅为57%.结果表明，在停曝时间为2~4 min下，停曝时间越长，越有利于颗粒污泥结构的稳定，同时可保持良好的亚硝化性能；停曝时间小于2 min时，厌氧好氧交替的环境不能完全实现，致使其运行效果倾向于连续曝气，失去了间歇曝气的环境优势，NOB菌得不到抑制，颗粒污泥呈现解体的趋势，导致亚硝化性能恶化；此外，较长曝气时间会有助于不规则形状颗粒的发展，停曝时间越长，PN/PS值越高，有利于颗粒表面疏水性的增强，污泥沉降性能越好. |
| 英文摘要 |
| The inhibition of the on/off aeration time ratio on nitrite oxidizing bacteria (NOBs) in intermittent aeration is the key to accumulating nitrite. This study explores the stable operation of nitrosated granular sludge under the same frequency of aeration and different combinations of stop exposure time. At 25-28℃, aerobic granular sludge was inoculated into a sequencing batch reactor (SBR) (R0) and acclimatized to nitrosated granular sludge by intermittent aeration and dissolved oxygen (DO) restriction. The effects of different on/off aeration time ratios in one sub-aeration cycle (3 min:3 min; 4 min:2 min; 2 min:4 min) on the performance of nitrosated granular sludge were analyzed using three same sets of SBRs (R1, R2, and R3). Experiments showed that the nitrite accumulation rates of R1 and R2 were higher, with average nitrite accumulation rates of 89% and 95%, respectively. The nitrosation performance of R3 was poor, and the nitrite accumulation rate at the end of the operation cycle was only 57%. The results showed that when the off-aeration time was between 2 and 4 minutes, the longer the off-aeration time was, the more stable the granular sludge structure was; hence, a good nitrosation performance could be maintained. When the off aeration time was less than 2 minutes, the alternation of anaerobic and aerobic environment could not be fully realized, which resulted in the sludge tending to stay in an environment of continuous aeration. Thus, the environmental advantage of intermittent aeration was lost; the NOBs could not be inhibited, and the granular sludge was disintegrated thereby leading to the deterioration of the nitrosation performance. Additionally, the longer aeration time contributed to the development of irregularly shaped particles. The longer the off-aeration time was, the higher the PN/PS value was, which was beneficial to the enhancement of the hydrophobicity of the particle surface and the sludge settling performance. |
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