作　　者： ; ; ; ;

机构地区： 西安建筑科技大学环境与市政工程学院

出　　处： 《西安建筑科技大学学报（自然科学版）》 2011年第4期522-528,共7页

摘　　要： 通过改变反应器曝气量、氨氮浓度与适时排泥可缩短自养短程硝化时间.利用微电极监测技术,测定反应器内好氧活性污泥絮体微观环境物质浓度变化规律.结果表明,逐步降低曝气量、增加氨氮浓度和适时排泥可以提高系统的NO-2-N积累浓度:在NH+4-N浓度由200 mgN/L提高到400 mgN/L,曝气量由35 L/H降到25 L/H,污泥浓度稳定在2 100～2 400 mg/L,历时23 dNO-2-N积累率由3.4%提高到91.86%.经过三个阶段,实现了全程硝化到短程硝化的转换过程;通过对污泥基团物质迁移转化的微生态监测发现,NO-2-N生成过程主要在污泥基团0～500μm内进行.试验条件下絮体内NO-2-N总产量从1.48μmol(cm2.h)-1增加到3.8μmol(cm2.h)-1,NO-3-N总产量从2.6μmol(cm2.h)-1降低到0.95μmol(cm2.h)-1;随着曝气量降低和氨氮浓度的提升,NO-2-N生成区域向污泥絮体表面迁移,亚硝氮氧化区域主要存在于氨氮氧化区域絮体更深处部位.测试发现物质在污泥界面迁移过程中明显衰减,表明污泥结构过于密实会影响物质迁移和净化效率. The shortcut nitrification has been developed through a gradual change of oxygen and ammonia nitrogen concentration in a SBR.In system process stages shift,the microelectrodes were used to explore the micro-environmental matter transport and conversion inside activated sludge flocs.Nitrite was accumulated by decreasing aeration rate from 35 L/H to 25 L/H and increasing ammonium concentration from 200 mgN/L to 400 mgN/L（equivalent to DO deceased from 1.0 mg/L to 0.5 mg/L）,the sludge concentration ranging in 21～24 mg/L.Atter 23 d and nitrite accumulation rate increasing to 91.86%.After three stages,the system was shifted from complete nitrification to shortcut nitrification.The variation of nitrogen insides flocs by changing environment conditions indicated nitrite was produced inner 0～500 μm of flocs.The fluxes of nitrite was improved from 1.48 μmol（cm2^2·h）^-1 to 3.8 μmol（cm^2·h）^-1,and the fluxes of the nitrate was decreased from 2.6 μmol（cm^2·h）^-1 to 0.95 μmol（cm^2·h）^-1.With decreasing of DO concentration and increasing of ammonia nitrogen concentration,nitrite torming zone transfored to the surface of sludge flocs,nitrite oxidizing zone mainly existed in deeper flocs.The substance in sludge interface significantly decreased,showing that too densed sludge structure will affect transformation and purification efficiency of nitrogen compounds.

关 键 词： 单级自养短程硝化 启动 微生态 迁移转化 微电极

领　　域： [环境科学与工程]