氧气浓度对好氧甲烷氧化耦合反硝化过程的影响

Effect of Oxygen Concentration on Process of Aerobic Methane Oxidation Coupled with Denitrification( AME-D )

好氧甲烷氧化耦合反硝化反应是一个重要连接甲烷和氮循环的过程。文中考察了4种氧气浓度(2.5%、5%、10%和21%)对好氧甲烷氧化耦合反硝化反应的影响。试验结果表明,21%的氧气浓度可以促进甲烷氧化,提高体系中溶解性有机碳的浓度,同时一定程度上抑制甲烷氧化耦合反硝化反应。甲烷浓度为6%~8%时,10%氧气浓度下甲烷氧化耦合反硝化反应的脱氮效率最高。

Aerobic methane oxidation coupled to denitrification (AME-D) was an important link between the methane and nitrogen cycles. In this study, effect of oxygen concentrations of 2. 5%, 5%, 10% and 21% on AME-D was investigated. The results showed that the oxygen concentration of 21 % could stimulate methane oxidation and increase the dissolved organic carbon concentrations in the system, but the nitrogen removal efficiency in AME-D was inhibited. When the methane concentration was 6%~8%, highest nitrogen removal efficiency in AME-D was observed at the oxygen concentration of 10%.