Realization of Short-cut Nitrification in a CAST Process at High Temperature and Its Phosphorus Removal Performance

被引：0
|
作者：
Ma J. [1 ,2 ]
Yang R.-C. [1 ]
Yu X.-J. [1 ]
Zhou M. [1 ]
Chen Y.-Z. [1 ,2 ]
机构：
[1] School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou
[2] Sewage Treatment Industry Technical Center of Gansu Province, Lanzhou
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 03期
关键词：
Cyclic activated sludge technology (CAST) reactor; High temperature; Nitrite accumulation; Phosphorus removal; Short-cut nitrification;
D O I：
10.13227/j.hjkx.201808254
中图分类号：
学科分类号：
摘要：
A synthetic wastewater was employed to investigate the realization of short-cut nitrification and its phosphorus removal performance in a CAST reactor operated at 22℃, 25℃, and 28℃. The results showed that TN removal of the system was stable and higher than 80% at different temperatures, and NH4+-N removal performed well. When the temperature was at 22℃ and 25℃, nitrite accumulation was not observed in the system and the phosphorus removal rate were 94.3% and 86.9%, respectively. When the temperature was increased to 28℃, nitrite accumulation efficiency in the reactor reached 87.2%, implying the system achieved a stable short-cut nitrification. In addition, in the short-cut nitrification stage at high temperature (28℃), the phosphorus release and uptake capacity of the system decreased. The anaerobic phosphorus release/COD consumption (P/C) ratio was much lower compared those at 22℃ and 25℃. However, the phosphorus removal performance of the reactor did not deteriorate at this stage. The phosphorus removal rate was 68.9%, indicating that a sufficient carbon source in the influent could not only guarantee the removal of TN, but also detoxify NO2- to reduce its inhibitory effect on the phosphate accumulating organisms (PAOs). The batch tests of phosphorus uptake by the sludge under different temperature conditions revealed that O2, NO3-, and NO2- could all be used as electron acceptors for phosphorus uptake. The aerobic phosphorus uptake rate was higher than that with NO3- and NO2- as electron acceptors. The phosphorus uptake rates of O2 and NO3- as electron acceptors were also found to be negatively correlated with temperature. © 2019, Science Press. All right reserved.
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页码：1375 / 1381
页数：6
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