有机碳源对同时硝化/反硝化(SND)过程的影响

EEFECTS OF ORGANIC CARBON RESOURCE ON PROCESS OF SIMULTANEOUS NITRIFICATION AND DENITRIFICATION (SND)

究了同时硝化 反硝化 (SimultaneousNitrificationandDenitrification ,SND)体系中有机碳源对氨氮去除的影响。实验结果表明 ,在氨氮初始浓度为 35mg L时 ,存在使氨氮降解率达到 99 5 %以上的有机碳源浓度区间 ,其CODCr浓度为40 0mg L～ 10 0 0mg L ;为保证反应后期体系中C N维持在微生物所需的水平 ,提出了补料的方式 ,使得氨氮降解不会出现停滞阶段 ,可以达到较好的去除效果 ;在周期为 8h的连续序批式 (SBR)操作中 ,采用较高的有机碳源初始进料值 ,并在反应过程中进行补料 ,可以很好的将出水氨氮的浓度维持在较低值 (<5mg L)

The effects of organic carbon resource on the removal of ammonium in simultaneous nitrification and denitrification (SND) system have been studied experimentally.Based on the mechanism of SND,it is clear that organic carbon resource is necessary for growth of microbes and denitrification process.The experimental results show that for special ammonium concentration, there was a suitable range of initial COD Cr within which the perfect removal efficiency of ammonium can be obtained.Batch feed mode was used.It has been seen that this mode helped maintain the C/N in the system,so the removal efficiency of ammonium was dramatically improved.Continuous experiments were operated by a SBR mode,the operating cycle of which was controlled at 8hr.The effluent ammonium concentration can reach to a relative low level with the batch feed mode.