生活污水硝化过程中亚硝态氮氧化阶段N_2O产生量研究  

STUDY OF NITROUS OXIDE PRODUCTION ORIGINATED FROM NITRITE OXIDATION PROCESS DURING NITRIFICATION OF WASTEWATER

作　　者：张静蓉[1] 王淑莹[1] 尚会来[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》2009年第S1期311-315,共5页Environmental Engineering

基　　金："十一五"国家科技支撑计划重点项目(2006BAC19B03)

摘　　要：为考察污水硝化过程中亚硝态氮氧化到硝态氮阶段N2O产生情况,本试验首先采用经生活污水长期驯化后的污泥,利用6LSBR反应器,在恒定曝气量60L/h条件下,研究了不同亚硝态氮浓度下此过程产生N2O的情况。实验发现污水硝化过程中产生的N2O除了产生于氨氧化过程,亚硝态氮氧化过程也是N2O的重要产生源。试验调节亚硝态氮浓度分别为81.45,65.29,40.18,16.82mg/L和1.64mg/L,结果发现随着亚硝态氮浓度的降低,N2O的产生量和转化率也有所降低,但当亚硝态氮浓度降低至1.64mg/L时,N2O的产生量和转化率却有所升高。试验还考察了恒定亚硝态氮浓度在30mg/L左右,不同溶解氧(DO)浓度条件下,N2O的产生情况,发现随着DO浓度的升高,N2O产量逐渐减少,但从节约能源同时减少N2O排放量方面综合考虑,建议最佳的DO浓度应控制在2mg/L。The experiment investigated the nitrous oxide(N_2O)production emitted during nitrite oxidation process under different nitrite concentrations using long term domesticated sludge.The control parameters were pH=8.0 and aeration rate 60 L/h,respectively.The results turned out that nitrite oxidation process was an important source of N_2O besides ammonium oxidation.The experiments were carried out under a series of nitrite concentrations,81.45,65.29,40.18,16.82 mg/L and 1.64 mg/L.It turned out that the production and conversion rate of N_2O were decreased along with the decreasing of nitrite concentration except 1.64 mg/L.The experiments also investigated the effect of dissolved oxygen(DO)on N_2O production and conversion rate with nitrite concentration 30 mg/L.The results showed that high DO was an effective way to control N_2O emission.However,taking energy saving and N_2O controlling into account,it was suggested that DO=2 mg/L was optimal.

关 键 词：污水处理 亚硝态氮 N2O 

分 类 号：X703[环境科学与工程—环境工程]