SBBR处理不同C/N值城市污水的脱氮除磷性能

Performance of Nitrogen and Phosphorus Removal from Municipal Wastewater with Different C/N Ratios Using Sequencing Batch Biofilm Reactor

采用自主设计的混纺棉线填料序批式生物膜反应器（SBBR）处理城市污水，控制水温为（25±1）℃、曝气量为150L／h，在C／N值为（8．04～11．85）、（4．59～6．12）、（3．21～4．09）的条件下分别运行了15、20、20d，对其脱氮除磷性能进行研究。结果表明：当C／N值为（8．04—11．85）、（4．59～6．12）、（3．21～4．09）时，对COD的平均去除率分别达到87．2％、92．3％、94．3％，对TP的平均去除率分别为96．0％、9,6．3％、96．7％，对TN的平均去除率分别为92．9％、67．3％、48．2％，对NH，～N的平均去除率分别为99．3％、99．7％、78．1％。可见，进水C／N值对去除COD和TP的影响较小，而对脱氮的影响较大，当C／N值低时脱氮效果较差。

The laboratory-scale fibre thread carrier sequencing batch biofilm reactor （SBBR） was developed to treat municipal wastewater with different C/N ratios. The performance of nitrogen and phos-phorus removal was investigated under different conditions of T = （25 ＋ 1 ）℃, aeration rate = 150 L/h , operation time = 15 d, 20 d and 20 d. When C/N ratios are 8.04 to 11.85, 4.59 to 6.12 and 3.21 to 4.09, the average removal rates of COD are 87.2%, 92.3% and 94.3%, those of TP are 96.0%, 96.3% and 96.7%, those of TN are 92.9%, 67.3% and 48.2%, and those of NH3 - N are 99.3%, 99.7% and 78.1%, respectively. The C/N ratios have little effect on the removal of COD and TP, while they have greater effect on the removal of nitrogen. When the C/N ratio is low, the removal efficiency of nitrogen is not remarkable.