序批式移动床生物膜反应器脱氮除磷影响因素及特性

考察了曝气量、进水C/N比（COD/TN）及进水氮、磷浓度对序批式移动床生物膜反应器（SBMBBR）脱氮除磷效果的影响，分析了该复合生物系统的污染物去除特性。实验结果表明，反应器脱氮主要是基于好氧段发生的同时硝化反硝化（SND）作用实现的，而除磷是基于常规生物除磷和反硝化除磷过程而完成；在保持载体良好流化状态的前提下，反应器硝化效果和TP去除受曝气量变化影响不大，反硝化效果随曝气量的减小而改善；采用厌氧/好氧序批式运行方式，能够使进水中的有机物被反硝化聚磷菌优先利用，实现一碳两用，节省了脱氮对外部碳源的需要，在进水C/N为2.8～4.0时能获得良好的硝化、反硝化和TP去除效果；随着进水氮、磷浓度的提高，反应器除磷效果相对稳定，脱氮效果变差，最大氮、磷去除负荷分别达到0.17 kg TN·m^-3·d^-1和0.06 kg TP·m^-3·d^-1。

Characteristics and factors influencing denitrification and dephosphorization in sequencing batch moving bed biofilm reactor

In this paper,the effect of aeration rate,C/N ratio and the concentration of nitrogen and phosphorus at inflow point on the performance of a sequencing batch moving bed biofilm reactor(SBMBBR) was studied,and the mechanism of pollutants removal for hybrid microorganism system was also discussed.The experimental results demonstrated that nitrogen removal took mainly place in aerobic phase by simultaneous nitrification and denitrification(SND),while phosphorus removal carried out by conventional bio-dephosphorization and denitrifying phosphorus removal.The fluidized state of bed and DO concentration in the mixed liquid were affected by aeration rate.If good fluidized state could be kept(4.8—9.0 L·L-1·h-1 of aeration rate),denitrification could be improved with aeration rate decreased,while for nitrification and TP removal there was no obvious effect.If anaerobic/oxic sequencing batch operation mode was adopted,organics in influent water could be preferentially utilized by denitrifying phosphorus accumulating organisms,and the need of extra carbon for denitrification could be decreased.At 2.8—4.0 of C/N ratio in influent water a good nitrification,denitrification and TN removal could be obtained,and at 1.5 of C/N ratio,efficiency of denitrifying and TP removal deteriorated,at 7.4, both that of nitrifying and denitrifying decreased.With rising of nitrogen and phosphorus concentrations at inflow point,rate of phosphorus removal was not change while nitrogen removal poor,the maximum rate was 0.17 kg TN·m-3·d-1 and 0.06 kg TP·m-3·d-1 for nitrogen and phosphorus removal,respectively.