同步硝化反硝化工艺中DO浓度对N_2O产生量的影响  

Effects of DO concentrations on N_2O production in simultaneous nitrification and denitrification process

作　　者：王赛[1] 王淑莹[1] 巩有奎[1] 彭永臻[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：《环境工程学报》2011年第1期33-37,共5页Chinese Journal of Environmental Engineering

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);北京高校人才强教计划高层次人才资助项目(PHR20090502)

摘　　要：采用序批式生物膜反应器(SBBR),在连续曝气全程好氧的运行条件下,考察不同溶解氧浓度对同步硝化反硝化脱氮性能及N2O产量的影响。控制溶解氧浓度恒定在1、2、2.5和3 mg/L。结果表明,DO为2 mg/L和2.5 mg/L时,氨氮去除率分别为97.9%和98.5%,同步硝化反硝化率均为99%。DO为2 mg/L时,系统中N2O产生量最低,为0.423 mg/L,占氨氮去除量的1.4%;DO为3 mg/L时N2O的产生量最高,为2.01 mg/L,是DO为2 mg/L时的4.75倍。系统中亚硝酸盐的存在可能是高溶解氧条件下N2O产量增加的主要原因,同步过程中没有NOx-的积累即稳定的SND系统有利于降低生物脱氮过程中N2O的产生量。The performance of simultaneous nitrification and denitrification（SND） and N2O emission under different DO concentrations in the sequencing batch biofilm reactor（SBBR） were studied in this paper.Continuous aeration ran through the whole process.DO concentration was controlled at 1.0 mg/L,2 mg/L,2.5 mg/L and 3 mg/L,respectively.Results indicated that SND rates were high at the DO concentration of 2 mg/L and 2.5 mg/L,the ammonium removal rates were 97.9% and 98.5%,respectively.The emitted N2O and dissolved N2O were detected.The lowest N2O production was 0.423 mg/L when DO concentration was controlled at 2 mg/L,accounted for 1.4% of the ammonium removal amount.The highest N2O production of 2.01 mg/L was detected at DO concentration of 3 mg/L,which was 4.75 times higher than that at DO concentration of 2 mg/L.The N2O emission during simultaneous nitrification and denitrification is a result of co-action between nitrification and denitrification,and a balanced SND can reduce the N2O production.The proposal of reducing N2O production while pursuing high efficiency of nitrogen removal was put forward based on this research.

关 键 词：N2O DO浓度 同步硝化反硝化 序批式生物膜反应器 

分 类 号：X703.1[环境科学与工程—环境工程]