初始pH值对序批式CANON工艺脱氮效果和N_2O释放的影响  

Effect of Initial pH on Nitrogen Removal Performance and N_2O Emission of a Sequencing Batch CANON Reactor

作　　者：付昆明[1] 王会芳[1] 苏雪莹[1] 周厚田 

机构地区：[1]北京建筑大学环境与能源工程学院,城市雨水系统与水环境省部共建教育部重点实验室,北京100044

出　　处：《环境科学》2016年第11期4261-4267,共7页Environmental Science

基　　金：国家自然科学基金项目(51308025);北京市科研基地建设项目(2016)

摘　　要：在温度为30℃±1℃条件下,采用陶粒为填料的序批式CANON反应器,以人工配置无机高氨氮废水为进水,研究不同初始pH值对CANON工艺脱氮效果和N_2O释放的影响.试验过程中,控制进水氨氮浓度相同,HRT=5 h,曝气量为6m3·(m^3·h)^(-1)时,调节进水pH值分别为6.64、6.98、7.15、7.88和7.95,研究发现,初始pH值在6.64~7.95之间时,CANON工艺脱氮效果基本保持稳定,TN去除率分别为81.38%、87.32%、92.12%、88.21%和86.84%,TN去除负荷均在1.56kg·(m3·d)-1以上;各周期初始N_2O释放速率基本相同,先升高后降低,且初始pH值越低N_2O释放速率峰值越高,而N_2O释放量和释放率也均随初始pH增加而减少.初始pH值在6.64~7.95之间对总氮去除影响不大,但对N_2O释放有较大影响.要同步实现CANON工艺高效脱氮和N_2O释放减量化,应将进水pH调节在7.90附近.A completely autotrophic nitrogen removal over nitrite（ CANON） reactor with haydite as carrier was operated in a sequencing batch biofilm reactor. The effect of different initial pH on nitrogen removal performance and N2O emission was investigated using synthetic inorganic ammonia-rich wastewater as influent at 30℃ ± 1℃. During the experiment,the pH of influent was controlled at 6. 64,6. 98,7. 15,7. 88 and 7. 95 under the same influent ammonia concentration condition,with hydraulic retention time of 5hours and aeration rate of 6 m3·（ m^3·h）^（-1）. The results showed that,when the initial pH was between 6. 64 and 7. 95,the performance of autotrophic nitrogen removal over nitrite was basically stable. The total nitrogen removal efficiencies were 81. 38%,87. 32%,92. 12%, 88. 21% and 86. 84%, respectively. And the total nitrogen removal loads were all higher than 1. 56kg·（ m3·d）- 1. Initial N2O emission rates were basically equal and decreased after rising to a peak value. Besides,the lower the initial pH was,the higher the maximum N2O emission rate was. In addition,N2O emissions and ratios decreased with rising initial pH.Initial pH between 6. 64 and 7. 95 had little influence on nitrogen removal but N2O emissions. Initial pH should be kept at about 7. 90 to achieve high efficient nitrogen removal and reduction of N2O emission synchronously.

关 键 词：pH CANON 氧化亚氮 脱氮 序批式生物膜反应器 

分 类 号：X703[环境科学与工程—环境工程]