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CAST工艺高温短程硝化的实现及其除磷性能
摘要点击 96  全文点击 26  投稿时间:2018-08-29  修订日期:2018-09-12
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中文关键词  CAST反应器  高温  亚硝酸盐积累  短程硝化  除磷
英文关键词  cyclic activated sludge technology (CAST) reactor  high temperature  nitrite accumulation  short-cut nitrification  phosphorus removal
作者单位E-mail
马娟 兰州交通大学环境与市政工程学院, 兰州 730070
甘肃省污水处理行业技术中心, 兰州 730070 
meggyma@163.com 
杨蕊春 兰州交通大学环境与市政工程学院, 兰州 730070  
俞小军 兰州交通大学环境与市政工程学院, 兰州 730070  
周猛 兰州交通大学环境与市政工程学院, 兰州 730070  
陈永志 兰州交通大学环境与市政工程学院, 兰州 730070
甘肃省污水处理行业技术中心, 兰州 730070 
 
中文摘要
      以模拟废水为研究对象,考察了22、25、28℃这3个温度下CAST反应器内短程硝化的实现及其除磷性能.结果表明,不同温度下系统的TN去除均稳定在80%以上,且NH4+-N去除良好.当温度为22℃和25℃时系统内未观察到亚硝积累,除磷率为94.3%和86.9%,升高温度至28℃,反应器内亚硝积累率为87.2%,实现稳定的短程硝化.此外,高温短程硝化阶段(28℃),系统释、吸磷能力较22℃和25℃均有所下降,且厌氧段释磷量/COD消耗量(P/C)比明显低于前两个阶段.然而,该温度条件下反应器除磷性能并未恶化,除磷率为68.9%,说明进水碳源充足不仅能保证CAST工艺对TN的去除,同时可用于解毒NO2-以减弱其对聚磷菌的抑制.不同温度条件下的污泥吸磷小试发现,O2、NO3-、NO2-均可作为电子受体进行吸磷,其中好氧吸磷速率高于以NO3-和NO2-为电子受体的反硝化吸磷速率,且以O2和NO3-为电子受体的吸磷速率与温度呈负相关.
英文摘要
      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.

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