不同温度下短程硝化过程温室气体释放研究

Greenhouse Gas Emission Characteristics during Partial Nitrification Process at Different Temperatures

采用SBR反应器启动短程硝化工艺处理高氨氮污水,分析不同温度对短程硝化工艺氮转化过程及温室气体释放特征的影响。结果表明,随温度的降低,氨氮去除和亚硝酸盐的积累受到明显抑制。短程硝化过程释放的温室气体主要集中于曝气阶段,且以CO_2和N_2O为主。反应器在25℃和15℃条件下运行时,温室气体的释放量分别减少了31%和61%。短程硝化工艺中N_2O的释放占总温室气体的96%以上,是最主要的温室气体。

Partial nitrification process was achieved in SBR to treat high ammonium wastewater at different temperatures, and the impacts of low temperature on nitrogen transformation and greenhouse gas （GHG） emission characteristics were also analyzed. The results showed that the removal of ammonium and accumulation of nitrite were inhibited due to the decrease of temperature. The GHG emission mainly occurred at aeration stage, and CO2 and N2O were dominant. When running at 25℃ and 15℃, the emission amount of GHG （CO2-equivalent amount） of the SBR were decreased by 31% and 61%, respectively. The N2O contributed to 96% of the total GHG, and was the dominant greenhouse gas.