摘要
污水生物反硝化脱氮过程是一氧化二氮(N2O)的重要释放源之一.试验采用序批式反应器以甲醇为碳源(电子供体),硝酸盐(NO3--N)为电子受体驯化反硝化菌,并采用批处理试验研究不同电子受体、不同碳氮(C/N)比和不同初始亚硝酸盐(NO2--N)质量浓度条件下N2O释放情况.在典型周期试验和批处理试验中均能检测到N2O的释放.以NO2--N为电子受体时会释放较多的N2O,而以NO3--N为电子受体时释放的N2O相对较少.不同C/N比通过影响反硝化菌的活性进而影响N2O的释放,反硝化菌的活性和N2O的释放量均随着C/N比的降低而降低.N2O的释放量随着初始NO2--N质量浓度的增加而增加,一定浓度范围内的NO2--N会增强反硝化菌的活性.初始NO2--N质量浓度与N2O的释放量具有较好的指数相关性.
Denitrification of wastewater is one of the important sources of nitrous oxide（N2O）.In this study,denitrifies were acclimated in a sequencing batch reactor with methanol and nitrate（NO-3-N） as the electron donor and acceptor,respectively.N2O emission during denitrification was examined both in typical cycles and in batch experiments under conditions of different electron acceptors,carbon/nitrogen（C/N） ratios and initial nitrite（NO-2-N） concentrations.With methanol as the organic carbon,the N2O emission was high with NO-2-N as the electron acceptor and the N2O emission was low with NO-3-N as the electron acceptor.The C/N ratios affected the emission of N2O by affecting activities of denitrifiers,and both the activity of denitrifiers and the emission of N2O decreased with decreasing C/N ratios.The N2O emission increased with increasing initial NO-2-N concentrations,and a certain range of NO-2-N concentrations enhanced the activity of denitrifiers.The N2O emission could be correlated very well with initial NO-2-N concentrations.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第4期1421-1427,共7页
Environmental Science
基金
深圳市科工贸信委基础研究计划项目(JC201006030878A)
深圳市人居环境委员会环境科研基金项目
