生物膜与A/O工艺耦合快速降解氨氮

应用由城市污水处理厂序批式间歇反应器(SBR)中筛选得到的4株特殊氨氧化菌,分别在SBR和有回流的生物膜与A/O工艺耦合体系培养中,考察其降解低碳高氨氮废水的功能.结果表明,自养硝化与异养氨氧化菌的混合菌群较单一自养硝化菌株降解氨氮速率快;在生物膜与A/O工艺耦合系统中,自养硝化与异养氨氧化菌协同代谢加速氨氮氧化脱除,氨氮脱除速率远比SBR系统快.对生物膜与A/O工艺耦合系统中氨氮脱除动力学进行了研究,模拟了NH4 、NO2-质量浓度与氨氮脱除比速率之间的关系,模型得到了较好的验证.

NH3-N removal by coupled system of bio-membrane and A/O process

Four strains of ammonium oxidizing bacteria were isolated from the sludge of a sequencing batch reactor(SBR) in a local wastewater treatment plant.The capacity of denitrification was investigated in SBR and A/O with bio-membrane process respectively under low carbon and high ammonium-nitrogen condition.The results indicated that the removal rate of NH_3-N by mixed strains was higher than that by the single autotrophic.The removal rate of NH_3-N was quite higher in the treatment system of A/O process with bio-membrane than that in SBR system,because more extensive anaerobic/aerobic interface existed in the A/O with bio-membrane system,and catalytic activity of the coupled enzymes of the autotrophic and the heterotrophic was higher than that of the single autotrophic organism.The dynamics of the removal of NH_3-N in the coupled system of bio-membrane and A/O process was simulated and the model related to the concentration of NH~ _4and NO~-_2 was obtained.The model has been validated by experiments.