| 初始pH值对序批式CANON工艺脱氮效果和N2O释放的影响 |
| 摘要点击 3663 全文点击 1293 投稿时间：2016-04-26 修订日期：2016-06-02 |
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| 中文关键词 pH CANON 氧化亚氮 脱氮 序批式生物膜反应器 |
| 英文关键词 pH CANON N2O nitrogen removal sequencing batch biofilm reactor |
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| 中文摘要 |
| 在温度为30℃±1℃条件下，采用陶粒为填料的序批式CANON反应器，以人工配置无机高氨氮废水为进水，研究不同初始pH值对CANON工艺脱氮效果和N2O释放的影响.试验过程中，控制进水氨氮浓度相同，HRT=5 h，曝气量为6 m3·（m3·h）-1时，调节进水pH值分别为6.64、6.98、7.15、7.88和7.95，研究发现，初始pH值在6.64~7.95之间时，CANON工艺脱氮效果基本保持稳定，TN去除率分别为81.38%、87.32%、92.12%、88.21%和86.84%，TN去除负荷均在1.56 kg·（m3·d）-1以上；各周期初始N2O释放速率基本相同，先升高后降低，且初始pH值越低N2O释放速率峰值越高，而N2O释放量和释放率也均随初始pH增加而减少.初始pH值在6.64~7.95之间对总氮去除影响不大，但对N2O释放有较大影响.要同步实现CANON工艺高效脱氮和N2O释放减量化，应将进水pH调节在7.90附近. |
| 英文摘要 |
| A completely autotrophic nitrogen removal over nitrite (CANON) reactor with haydite as carrier was operated in a sequencing batch biofilm reactor. The effect of different initial pH on nitrogen removal performance and N2O emission was investigated using synthetic inorganic ammonia-rich wastewater as influent at 30℃±1℃. During the experiment, the pH of influent was controlled at 6.64, 6.98, 7.15, 7.88 and 7.95 under the same influent ammonia concentration condition, with hydraulic retention time of 5 hours and aeration rate of 6 m3·(m3·h)-1. The results showed that, when the initial pH was between 6.64 and 7.95, the performance of autotrophic nitrogen removal over nitrite was basically stable. The total nitrogen removal efficiencies were 81.38%, 87.32%, 92.12%, 88.21% and 86.84%, respectively. And the total nitrogen removal loads were all higher than 1.56 kg·(m3·d)-1. Initial N2O emission rates were basically equal and decreased after rising to a peak value. Besides, the lower the initial pH was, the higher the maximum N2O emission rate was. In addition, N2O emissions and ratios decreased with rising initial pH. Initial pH between 6.64 and 7.95 had little influence on nitrogen removal but N2O emissions. Initial pH should be kept at about 7.90 to achieve high efficient nitrogen removal and reduction of N2O emission synchronously. |
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