Nitrogen Removal from High Strength Ammonia Reject Water overNitrite Pathway in a Continuous Predenitrification Reactor
  • 【摘要】

    The startup and maintenance of nitritation of reject water were investigated in a previous denitrification reactor. A continuous-treatment experiment demonstrated that nitrite pathway started up succe... 展开>>The startup and maintenance of nitritation of reject water were investigated in a previous denitrification reactor. A continuous-treatment experiment demonstrated that nitrite pathway started up successfully by increasing the influent ammonium loading rate (ALR) from 0.23 to 0.78kgN/(m3d). Ammonia-oxidized bacteria(AOB) adapted quicker than nitrite oxidized bacteria(NOB) to load increase, which result in AOB predominant in the activated sludge system. Combination of free ammonia (FA) and free nitric acid (FNA) inhibition on NOB was important for stable nitritation of reject water. Nitrite accumulation ratio of more than 90%was maintained over 40days, when average FA and FNA concentration was 0.5 and 0.04 mg/L, respectively. The experimental results also demonstrated that FNA inhibition play a key role in nitrite pathway. The nitrite accumulation ratio slightly decreased from 91%to 79%in 30 days as the ALR decrease. In this stage, average FA concentration weakened but FNA inhibition on NOB still existed. But under the same ALR, the nitritation was destroyed completely in 3 days after the inhibition of FNA was eliminated by sufficient alkalinity, which showed the inhibition of FNA other than FA was critical to maintain steadily nitritation. 收起<<

  • 【作者】

    PENG Yong-zhen  HAN Xiao-yu  ZHANG Shujun  ZHANG Liang 

  • 【作者单位】

    Key

  • 【会议名称】

    第四届全国博士生学术会议-暨环境科学与工程新理论、新技术学术研讨会

  • 【会议时间】

    2010-10-25

  • 【会议地点】

    北京

  • 【主办单位】

    中国环境科学学会   清华大学

  • 【语种】

    chi

  • 【关键词】

    partial nitrification  free ammonia  free nitric acid  reject water  stability