| 污水反硝化过程中亚硝酸盐的积累规律 |
| 摘要点击 3791 全文点击 3520 投稿时间：2010-06-08 修订日期：2010-08-13 |
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| 中文关键词 亚硝酸盐积累 反硝化 甲醇 污水处理 厌氧氨氧化 |
| 英文关键词 nitrite accumulation denitrification methanol wastewater treatment anaerobic ammonium oxidation(ANAMMOX) |
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| 中文摘要 |
| 采用SBR反应器，以甲醇为碳源，研究了污水反硝化过程中的亚硝酸盐积累现象.在试验温度为14℃，初始pH值为7.33，污泥浓度为1000 mg·L-1条件下，反硝化过程中出现了明显的亚硝酸盐积累，亚硝酸盐浓度随着硝酸盐的不断还原而逐渐增加，2.5 h时，硝酸盐基本消耗完毕，亚硝酸盐浓度达到最大值22.35 mg·L-1，亚硝酸盐积累率(生成的NO-2-N/初始NO-3-N)为43.2％，在此过程中，pH值开始缓慢上升，至2.67 h达到7.79.随后，亚硝酸盐浓度开始逐渐下降，并最终消耗完毕，在此过程中，pH值开始快速上升，并在硝酸盐消耗完毕时形成了一个明显的拐点，因而可作为硝酸盐耗尽的指示参数，至3.5 h时pH达到最大值8.35，最后略有下降.产生亚硝酸盐积累的原因是系统中硝酸盐的存在抑制了亚硝酸盐的还原，导致硝酸盐还原速率大于亚硝酸盐还原速率. |
| 英文摘要 |
| Characteristics of nitrite accumulation during denitrification process were studied by using methanol as the sole organic carbon in a batch-scale sequencing batch reactor with synthetic wastewater. Under the condition of temperature was 14℃, initial pH value was 7.33 and sludge concentration was 1000 mg·L-1, nitrite accumulated significantly during denitrification process. Nitrite concentration increased gradually with nitrate reduction and reached its maximum value of 22.35 mg·L-1 in 2.5 h when nitrate reduction was almost completed, the amount of accumulated nitrite was equivalent to 43.2% of the amount of initial nitrate. During this period, pH value gradually increased to 7.79 in 2.67 h. Then accumulated nitrite kept decreasing until to zero. When the concentration of nitrate reduced to zero, the increasing rate of pH rise dramatically, formed a breakpoint of pH curve. Therefore, the breakpoint of pH curve can be used as an indicator to show the end of nitrate reductive reaction. The pH value reached its maximum value of 8.35 in 3.5 h and decreased a little afterward. The reason for the accumulation of nitrite is the inhibition of nitrate on nitrite reductive reaction, caused the reductive rate of nitrate was more than that of nitrite. |
