ρ(C)ρ/(N)对污水反硝化过程中N_2O产生的影响  

Effects of ρ(C)/ρ(N) on N_2O Production During Denitrification

作　　者：彭永臻[1] 尚会来[1] 张静蓉[1] 王淑莹[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京100124

出　　处：《北京工业大学学报》2010年第4期517-522,共6页Journal of Beijing University of Technology

基　　金：'十一五'计划重点资助项目(2006BAC19B03);北京市高校人才强教计划高层次人才资助项目(PHR20090502);北京工业大学研究生科技基金资助项目(ykj-2007-1063)

摘　　要：利用SBR反应器硝化结束的混合液,通过投加不同碳源量和利用内源碳源反硝化,考察了不同ρ(C)/ρ(N)对污水反硝化过程中N2O产生情况的影响.控制ρ(C)/ρ(N)分别为0、1.2、2.4、3.5、5.0和20,结果发现,不投加外碳源条件下,利用内源碳源反硝化过程反硝化率仅有10%,产生的ρ(N2O)也很低.投加外碳源控制ρ(C)/ρ(N)为1.2和2.4条件下,反硝化率分别为18.44%和33.55%,产生的ρ(N2O)同样较低,ρ(C)/ρ(N)=3.5和5.0时,反硝化率升高到了71%和91.4%,产生的ρ(N2O)也升高到0.227 mg/L和0.135 mg/L,是不加外碳源时产生量的30倍和18倍.继续提高ρ(C)/ρ(N)到20,发现反硝化率可以达到99.29%,产生的ρ(N2O)增高到了0.317 mg/L.可见,在污水反硝化过程中,虽然ρ(C)/ρ(N)过低产生的ρ(N2O)很少,但严重影响反硝化效果,要得到较高的反硝化率,需要较高的ρ(C)/ρ(N),但是ρ(C)/ρ(N)较低和过高时都会产生较高的ρ(N2O),所以,污水反硝化过程中应该控制ρ(C)/ρ(N)在5左右,既可以实现较高的反硝化氮去除率,又可减少ρ(N2O)的产生.The experiments investigated the production of N2O under different ρ（C）/ρ（N） during denitrification using nitrification treated wastewater in SBR.Different ρ（C）/ρ（N）,which were 0、1.2、3.5、5.0 and 20,respectively were used.The results showed that the production of N2O using endogenic carbon resource was small and the denitrification rate was only 10%.Under the ρ（C）/ρ（N） 1.2 and 2.4 condition,the production of N2O were also small and the denitrification rates were 18.44% and 33.55%,respectively.When the ρ（C）/ρ（N） were 3.5 and 5.0,the denitrification rates were 71% and 91.4% and the production of N2O were 0.227mg/L and 0.135mg/L,respectively.They were 30 and 18 times higher than that using endogenic carbon source process.Increasing the ρ（C）/ρ（N） to 20,the denitrification rate was 99.29% and the production of N2O was 0.317mg/L.Consequently,the denitrification process could produce fewer N2O,but it severely affected the denitrification effect.To reach a high denitrification rate,it was necessary to increase the ρ（C）/ρ（N）,but production N2O also increased.Therefore,in the denitrification process,it suggests that limiting the ratio of ρ（C）/ρ（N） around 5 can achieve good denitrification performance and produce fewer N2O.

关 键 词：反硝化 ρ(C)/ρ(N) N2O 

分 类 号：X703.1[环境科学与工程—环境工程]