不同碳源条件下污水生物脱氮过程中N_2O的释放规律  

N_2O Emission during Biological Nitrogen Removal from Sewage under Different Carbon Sources

作　　者：刘国华[1] 庞毓敏 范强[1] 蒋松竹[1] 王洪臣[1] 

机构地区：[1]中国人民大学环境学院,北京100872

出　　处：《环境保护科学》2016年第1期90-94,共5页Environmental Protection Science

基　　金：中央高校基本科研业务费专项资金(13XNLF04)资助

摘　　要：以3类常用的碳源(乙酸钠、葡萄糖和甲醇)为研究对象,在3个稳定运行的SBR系统内考察了碳源种类对污水生物脱氮过程中N_2O释放的影响。结果显示,各系统内N_2O的释放主要发生在好氧硝化阶段,且在以乙酸钠为碳源的系统内氨氧化速率最快,TN去除率最大,但同时N_2O的释放速率、累积释放量(4.44 mg)和转化率(1.3%)也最大。而以甲醇为碳源的小试系统脱氮效果较差,TN去除率仅为59.5%,但N_2O的释放速率、累积释放量和转化率均最低。在实际污水处理过程中,当以温室气体N_2O释放作为判断标准时,此研究结果可为碳源的选择提供依据。In this paper, three common carbon sources（sodium acetate, glucose and methanol） were taken as the study targets and the effects of carbon source types on N_2O emission during biological wastewater treatment in three stable operated SBR systems were investigated. The results showed that N_2O emission mainly occurred during the aerobic nitration phase. In the system with sodium acetate as the carbon source, the ammonia oxidation rate was the fastest and the best nitrogen removal efficiency was obtained. Moreover, the emission rate, accumulated emission amount（4.44 mg） and conversion rate（1.3%） of N_2O were highest. In the system with methanol as the carbon source, the denitrification effects were poor with the removal rate of TN only 59.5%, and the emission rate, accumulated emission amount and conversion rate of N_2O were lowest. Such study results would be helpful for selecting appropriate carbon source during actual wastewater treatment if N_2O assessment was necessary.

关 键 词：污水生物脱氮 N_2O 碳源 好氧段 AOB反硝化 

分 类 号：X703[环境科学与工程—环境工程]