| 不同运行模式下改良型CAST工艺处理生活污水的除磷性能 |
| 摘要点击 1829 全文点击 495 投稿时间：2017-05-21 修订日期：2017-06-06 |
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| 中文关键词 改良型CAST工艺 C/P 温度 回流比 |
| 英文关键词 modified CAST COD/TP ratio temperature sludge reflux ratio |
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| 中文摘要 |
| 实验采用改良型CAST工艺，以生活污水为研究对象，考察了C/P、回流比及温度等不同运行模式对系统除磷性能的影响.结果表明，常温条件下进水C/P由50升至100，系统除磷率均值从15%迅速升至95.6%，除磷性能显著提高；继而降低C/P至75，除磷性能因进水碳源不足再度下降，除磷率均值为51.4%，且长期投加易降解碳源引发系统污泥膨胀并导致污泥大量流失.C/P较低情况下，回流比由25%降低至12.5%，除磷性能提高2.3倍，继续降低回流比至0，除磷性能反而下降；温度实验研究则表明，低温系统（14℃±1℃），除磷率稳定维持在90%以上，而高温短程硝化系统（27℃±1℃）除磷率仅为14.1%，可见低温更有利于系统磷的去除.吸磷小试发现，常温系统污泥以O2、NO3-和NO2-为电子受体均能进行吸磷，而低温系统污泥能以O2、NO3-为电子受体进行吸磷，高温系统污泥则仅能以O2为电子受体进行少量吸磷.此外，实验还发现，系统短期闲置导致的污泥"饥饿"有利于系统除磷率的提高. |
| 英文摘要 |
| A modified cyclic activated sludge technology (CAST) treating domestic wastewater was employed to investigate the effects of different operating modes, such as C/P ratio, reflux ratio, and temperature on phosphorus removal. The results illustrated that at room temperature the phosphorus removal of the system improved significantly when the influent C/P ratio increased from 50 to 100, with the removal efficiency increasing rapidly from 15% to 95.6%. Decreasing the C/P ratio to 75, the phosphorus removal performance declined due to influent carbon source deficiency, and the mean phosphorous removal efficiency decreased to 51.4%. At the same time, the long-term addition of an easily degradable carbon source resulted in sludge bulking and a large amount of sludge loss. With a low C/P ratio, the phosphorus removal performance increased by 2.3 times when the sludge reflux ratio decreased from 25% to 12.5%. However, the phosphorus removal performance declined when reducing it to 0. The temperature experiment results showed that the phosphorous removal efficiency of the system remained stable, above 90%, in the low temperature system (14℃±1℃). However, the phosphorous removal efficiency of a shortcut nitrification system at high temperature (27℃±1℃) was only 14.1%, suggesting that a low temperature was beneficial for removing phosphorous. It was observed from the batch tests that the sludge at room temperature could utilize dissolved oxygen, nitrate, and nitrite as electron acceptors to take up phosphate. The sludge in the low temperature system could use both dissolved oxygen and nitrate as the electron acceptors. However, the sludge in the high temperature system could only use dissolved oxygen as the electron acceptors to take up phosphate. In addition, it was also found that sludge under starvation conditions resulting from short-term idling of the system favored phosphorus removal. |
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