SBBR单级自养脱氮系统N_2O排放特征分析  

The emission of N_2O during single SBBR completely autotrophic nitrogen removal system

作　　者：方芳[1] 张强[1] 陈猷鹏[1,2] 李凯[1] 李震涛[1] 郭劲松[1,2] 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045 [2]中国科学院重庆绿色智能技术研究院,重庆401122

出　　处：《重庆大学学报（自然科学版）》2014年第3期64-70,共7页Journal of Chongqing University

基　　金：国家自然科学基金(51278509;51108482)

摘　　要：采用3组人工配水的单级自养脱氮生物膜反应器,对比研究了曝气方式及碳源对系统N2O排放量和排放特征的影响。结果显示,1号、2号和3号反应器在一个运行周期内N2O累积排放量和N2O转化率分别为13.69、14.28、2.51mg和1.36%、1.49%、0.236%。连续曝气的1号反应器与间歇曝气的2号反应器相比,其N2O累积释放量、N2O转化率相近。进水含有机碳源的3号反应器N2O累积释放量、N2O转化率约为进水不含有机碳源的2号反应器的1/6。曝气方式对N2O排放特征影响较大,连续曝气的1号反应器N2O累积排放量持续增加,N2O平均排放速率和溶解态N2O质量浓度表现为先升高至最大值后持续下降。间歇曝气的2号反应器N2O排放量主要来自曝气段,N2O平均排放速率和溶解态N2O质量浓度整体呈现出先升高后降低的趋势。与其他生物脱氮工艺相比,单级自养脱氮工艺N2O转化率较低。Three single autotrophic denitrification biofilm reactors with artificial water are applied to study the influence of aeration treatments and carbon source on the N2O emission and N2O emission characteristics. The results show that the accumulative N2O emission amount and the conversion rate of N2O of reactor 1,2 and 3 in an operation cycle are 13. 69,14. 28,2. 51 mg, and 1. 36%,1. 49%, 0. 236%,respectively. The comparative results of reator 1 （continuous aeration） with reactor 2 （intermittent aeration） show their accumulative N2O emission amounts and N2O conversion rates are similar. The accumulative N2O emission amount and the N2O conversion rate of reactor 3 （organic carbon） are about 1/6 of those of reactor 2（without organic carbon）. Aeration treatments have great influence on N2O emission characteristics, for reactor 1, the accumulative N2O emission amount increases persistently, the mean N2O emission rate and dissolved N2O concentration performance continue to decline after the first rise to the maximum. For reactor 2, N2O emissions are mainly in aeration period. The mean N2O emission rate and dissolved N2O concentration reduce after first increase. The N2O conversion rate of single autotrophic nitrogen removal process is lower than those of other biological denitrification processes.

关 键 词：单级自养脱氮 N2O排放量 N2O排放速率 曝气方式 碳源 

分 类 号：X703.1[环境科学与工程—环境工程]