电子受体及投加方式对反硝化除磷及N_2O释放影响  

Effect of Electron Acceptors and Dosing Method on Denitrifying Phosphorus Removal and Nitrous Oxide Emission

作　　者：吕永涛[1] 张瑶[1] 闫建平 王磊[1] 刘婷[1] 孙婷[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《水处理技术》2017年第12期38-42,共5页Technology of Water Treatment

基　　金：国家自然科学基金项目(51108367);陕西省建设厅科技发展计划项目(2015-K61)

摘　　要：接种普通活性污泥,以乙酸钠和硝酸钾为基质,在厌氧/缺氧SBR系统中成功启动了反硝化除磷,单周期脱氮、除磷效率分别达到99.95%和72.07%,N_2O转化率(N_2O释放量/去除的TN量)为16.41%。在此基础上,以厌氧末污泥为对象通过批式实验对比研究了NO_2^--N及其投加方式对反硝化除磷及N_2O释放的影响,结果表明,一次性投加NO_2^--N时,脱氮、除磷效率分别下降至55.44%和33.54%,N_2O转化率达到25.08%;当改变亚硝氮的投加次数分别为4、3、2次时,N_2O转化率分别为27.05%、23.93%和27.25%,除磷效率分别达到81.82%、80.70%和56.56%。结果表明,分多次进水并控制较低的NO_2^--N浓度,可大幅提高反硝化除磷效率,而且不会导致N_2O转化率增大。Inoculated with conventional activated sludge, denitrifying phosphorus removal was successfully started up in a sequencing batch reactor （SBR） with sodium acetate and potassium nitrate substrate. During a single cycle, the removal efficiencies of NO3^--N and PO4^3- -P were 99.95% and 72.07%, respectively. The N2O conversion rate （ratio of N2O-N release amount to nitrogen removal amount） was 16.41%. Sludge were sampled at the end of the anaerobic phase from the SBR to investigate the electron acceptors and dosing method on denitrifying phosphorus removal and nitrous oxide （N2O） emission. The results showed that when NO2^--N feed frequency was only once, the nitrogen removal efficiency and P removal efficiency decreased to 55.44% and 33.54% respectively, while the N2O conversion rate increased to 25.08%. When changed the pulse addition frequency to 4 （influent concentration of NO2-N was 10 mg/L）, 3 （infiuent concentration of NO2^- -N was 15 rag/L）, 2 （influent concentration of NO2^- -N was 20 mg/L）, the N2O conversion rates were 27.05%, 23.93% and 27.25% respectively, and the P removal efficieneies reached 81.82%, 80.70% and 56.56%, respectively. The findings indicated that more frequent pulses of nitrite addition at smaller concentrations could have led to higher nitrogen removal efficiency and P removal efficiency, and could not cause N2O conversion rate increase.

关 键 词：反硝化除磷 SBR N2O 电子受体 投加方式 

分 类 号：X703[环境科学与工程—环境工程]