| 摘要: |
| 分别测试硝酸盐和亚硝酸盐在反硝化过程中的降解速率，由于亚硝酸盐的降解速率低于硝酸盐，在此过程中会有亚硝酸盐的积累.后续的实验表明，这一降解速率的差别是因为两者反硝化菌对电子亲和力不同导致电子流的分布不同造成的.在反硝化初期，硝酸盐获得电子较多，因而其降解速率较快.当硝酸盐的质量浓度低于亚硝酸盐后，亚硝酸盐的降解速率较快，这表明电子流主要流向亚硝酸盐. |
| 关键词: 反硝化 电子流 降解速率 |
| DOI：10.3969/J.ISSN.1000-5137.2017.04.005 |
| 分类号: |
| 基金项目:国家自然科学基金项目（50978164）；上海市地方高校能力建设项目（201607050300） |
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| Competition for electrons between nitrate and nitrite during denitrification |
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Zhang Yuting, Cao Lifeng, Li Naiyu, Zhang Yongming
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College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, China
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| Abstract: |
| Nitrate and nitrite removal rates were measured respectively during denitrificaiton,and experimental results showed that nitrite accumulated during nitrate removal,because nitrite removal rate was slower than nitrate.Following experiments documented that the difference between nitrate and nitrite was caused by different electron flow distribution between them,which was due to their different affinity to electron donors.In the initial stage of denitrification,nitrate removal rate was faster than nitrite as it obtained more electrons,but nitrite removal rate faster than nitrate when nitrate concentration was less than nitrite,during which electrons flowed to nitrite then. |
| Key words: denitrification electron flow biodegradation rate |
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