| Fe3+对同步硝化反硝化过程氮元素迁移转化及N2O释放的影响 |
| 摘要点击 2093 全文点击 1172 投稿时间：2014-12-09 修订日期：2015-01-06 |
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| 中文关键词 同步硝化反硝化(SND) 氮元素迁移转化 N2 O Fe3+ 温室气体 |
| 英文关键词 simultaneous nitrification and denitrification(SND) nitrogen immigration and transformation N2O Fe(Ⅲ) greenhouse gases |
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| 中文摘要 |
| 采用SBR反应器,研究了不同浓度的Fe3+对同步硝化反硝化(simultaneous nitrification denitrification, SND)过程中氮元素迁移转化去除和N2 O释放的影响. 结果表明, 在同步硝化反硝化过程中,系统中Fe3+浓度为20mg ·L-1时可以提高系统对氮的去除率,而60mg ·L-1的Fe3+则会对其产生抑制效果. 并且,高浓度的Fe3+会刺激SND过程中N2 O的释放,N2 O转化率也有所提高. 这主要是因为: ①高浓度的Fe3+会导致污泥脱氢酶活性降低,使得NO-2在好氧阶段大量累积; ②高浓度的Fe3+减少了SND过程前置厌氧阶段胞内聚合物(polyhydroxybutyrate, PHB)的含量,使得后续反硝化过程碳源减少. Fe3+对SND过程中总磷的去除有促进作用,并且Fe3+浓度越高,总磷去除率越高,这主要是因为Fe3+的存在使系统中发生了化学除磷作用. |
| 英文摘要 |
| Effect of Fe(Ⅲ) concentration on nitrogen immigration and transformation and nitrous oxide emission during the simultaneous nitrification denitrification (SND) process was investigated. Higher nitrogen removal efficiency was obtained when the Fe(Ⅲ) concentration was 20 mg ·L-1, while lower nitrogen removal efficiency was observed when the Fe(Ⅲ) concentration turned to 60 mg ·L-1. In addition, higher Fe(Ⅲ) concentration significantly enhanced the N2 O emission, as well as the N2 O conversion ratio. This was mainly attributed to ① the high concentration of nitrite accumulation during the oxic stage, which was caused by lower dehydrogenase activity at high Fe(Ⅲ) concentration; ② less PHB production during the anoxic stage, which would led to shortage of carbon source for denitrification in the following oxic stage. The results also showed that Fe(Ⅲ) addition could improve the TP removal efficiency. TP removal efficiency increased with increasing Fe(Ⅲ) concentration, mainly because of extra chemical reaction. |
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