低碳城市污水脱氮工艺中硝化颗粒污泥的培养

Cultivation of Nitrifying Granular Sludge in Low-carbon Municipal WastewaterNitrogenRemoval Process

为了实现低碳城市污水高效深度脱氮,构建短程反硝化/厌氧氨氧化+硝化颗粒污泥脱氮工艺,研究硝化颗粒污泥的培养策略。结果表明,采用上向流污泥床(USB)反应器以序批式运行,并逐步缩短沉淀时间,成功培养出了硝化颗粒污泥,其中90.52%的污泥颗粒粒径>0.5 mm;颗粒污泥的沉降速度随着粒径的增大而增大,0.5~0.9 mm粒径的颗粒污泥平均沉降速度为15.66 m/h。颗粒污泥形成后,USB反应器的氨氮容积去除速率达到1.31 g/(L·d)。短程反硝化厌氧氨氧化+硝化颗粒污泥工艺的脱氮性能分析结果表明,该工艺脱氮效率高、有机碳源需求量低,适合处理低碳城市污水并实现深度脱氮。

To achieve efficient and advanced nitrogen removal of low-carbon municipal wastewater,this paper established a process consisting of partial denitrification/Anammox and nitrifying granular sludge(PDA-N),and investigated the cultivation of nitrifying granular sludge.The up-flow sludge bed(USB)reactor was run in sequential batch mode and the settling time was gradually shortened.Nitrifying granular sludge was thus successfully cultivated,and 90.52% of the nitrifying granular sludge had a particle size greater than O.5 mm.The settling velocity of granular sludge increased with the increase of particle size,and the average settling velocity of particles with particle size of 0.5-0.9 mm was 15.66 m/h.After the formation of granular sludge,the volumetric removal rate of ammonia nitrogen in the USB reached 1.31 g/(L·d).The PDA-N process had high nitrogen removal efficiency and low demand for organic carbon sources,which was suitable for advanced nitrogen removal of low-carbon municipal wastewater.