CAJ | 학술논문

为考察生活污水硝化过程的亚硝态氮氧化阶段是否有N_2O产生,利用经生活污水长期驯化后的污泥和SBR反应器,在pH值为8、曝气量为60 L/h的条件下,研究了不同NO_2~-N浓度下N_2O的产生情况.试验发现,除了氨氧化阶段,NO_2~-N氧化阶段也是N_2O的重要产生源.调节NO_2~-N浓度分别为81.45、65.29、40.18和16.82 mg/L,结果发现随着NO_2~-N浓度的降低,N_2O的产生量和转化率也有所降低,但当NO_2~-N浓度降低至1.64 mg/L时,N_2O的产生量和转化率却有所升高.此外,还考察了NO_2~-N浓度为30 mg/L左右时,不同pH下N_2O的产生情况.结果表明,随着pH的升高则N_2O的产量逐渐减少.综合考虑运行成本和减少N_2O生成量的效果,应控制pH值在7以上.
위고찰생활오수초화과정적아초태담양화계단시부유N_2O산생,이용경생활오수장기순화후적오니화SBR반응기,재pH치위8、폭기량위60 L/h적조건하,연구료불동NO_2~-N농도하N_2O적산생정황.시험발현,제료안양화계단,NO_2~-N양화계단야시N_2O적중요산생원.조절NO_2~-N농도분별위81.45、65.29、40.18화16.82 mg/L,결과발현수착NO_2~-N농도적강저,N_2O적산생량화전화솔야유소강저,단당NO_2~-N농도강저지1.64 mg/L시,N_2O적산생량화전화솔각유소승고.차외,환고찰료NO_2~-N농도위30 mg/L좌우시,불동pH하N_2O적산생정황.결과표명,수착pH적승고칙N_2O적산량축점감소.종합고필운행성본화감소N_2O생성량적효과,응공제pH치재7이상.
Long-term acclimated sludge and SBR were used to investigate the production of nitrous oxide (N_2O) from nitrite nitrogen oxidation during nitrification of domestic sewage under the conditions of pH 8, aeration rate 60 L/h and different nitrite nitrogen concentrations. Besides ammonium oxidation, nitrite nitrogen oxidation process is an important source of N_2O. When nitrite nitrogen concentrations are regulated at 81.45 mg/L, 65.29 mg/L, 40.18 mg/L and 16.82 mg/L respectively, the production and conversion rate of N_2O are gradually reduced. However, when nitrite nitrogen concentration is decreased to 1.64 mg/L, the production and conversion rate of N_2O are increased. With the increase of pH, the production of N_2O is gradually reduced when nitrite nitrogen concentration is 30 mg/L. Taking the opera-tion cost and reduction of N_2O emission into account, pH should be controlled at more than 7.