碳氮比对生物反硝化中N_2O产量的影响  

Effect of ρ(COD)/ρ(N) on Nitrous Oxide(N_2O) Production in Biological Denitrification

作　　者：王淑莹[1] 王赛[1] 巩有奎[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》2012年第6期898-903,共6页Journal of Beijing University of Technology

基　　金：'十一五'国家科技支撑计划重点项目(2006BAC19B03);北京市教委科技创新平台项目(PXM2008_014204_050843)

摘　　要：利用间歇式反应器(sequencing batch reactor,SBR),以乙醇作为外加碳源,考察不同化学需氧量(chemicaloxygen demand,COD)与氮的质量浓度的比值对全程和短程反硝化脱氮过程中N2O产量的影响.全程反硝化过程中,调节ρ(COD)/ρ(N)为1.56、2.83、4.56、6.01和10.0,短程反硝化中调节ρ(COD)/ρ(N)为1.51、2.45、3.33、4.13和9.7.结果表明,全程和短程反硝化的最佳ρ(COD)/ρ(N)分别为6.01和4.13,硝酸盐和亚硝酸盐完全被还原,反硝化过程中几乎没有N2O产生,1 g混合液悬浮固体(mixed liquor suspended solids,MLSS)每天还原的硝态氮和亚硝态氮分别可达0.077和0.089 g.在碳源充足的条件下,反硝化速率不再随着有机物的增加而增加.在低ρ(COD)/ρ(N)时,短程反硝化过程中N2O产量远大于全程反硝化过程,最高可达0.607 mg/L.在碳源不足时,亚硝酸盐对氧化亚氮还原酶(N2O reductase,N2OR)的抑制作用和ρ(COD)/ρ(N)不足是影响系统N2O产量增加的主要原因.Sequencing batch reactors （SBR） are used to investigate the greenhouse N2 0 production in complete and short-cut denitrifications under different p （COD）/p（N）. Using ethanol as carbon source to control p（ COD）/p（ N）, which are 1.56, 2.83,4.56,6.01, and 10.0 in complete denitrification and 1.51, 2.45,3.33,4. 13, and 9.7 in short-cut denitrification. Results show that 6.01 and 4. 13 are the optimum p （COD）/p （N） in complete and short-cut denitrifications respectively with little N2 0 production. One gram of mixed liquor suspended solids （MLSS） can reduce 0. 077 9 nitrate or 0. 089 9 nitrite per day. The specific denitrification rates increase with increasing p （ COD）/p （N）. However, there is no remarkable impact with adding organic matter when the carbon source is abundant. When the carbon source is insufficient, N2O production in short-cut denitrification is obviously larger than that in complete denitrification, and the amount topped 0. 607 mg/L at p （COD）/p （N） of 3.33. High N2O production under low p（ COD）/p（N） operations is mainly due to the inhibition of nitrite to the activity of nitrous oxide reductase.

关 键 词：N2O 碳氮比 全程反硝化 短程反硝化 

分 类 号：X703.1[环境科学与工程—环境工程]