曝停时间比对间歇曝气SBR短程硝化的影响

常温条件下(20~25℃),以生活污水为研究对象,采用间歇曝气序批式反应器1#、2#、3#,研究了不同曝停时间比(3:1、3:2、3:3)对亚硝酸盐氮积累、亚硝化稳定性、污染物去除效果及污泥沉降性能的影响.结果表明,在一定范围内,单元停曝时间所占比例越大,即曝停时间比越小越有利于亚硝酸盐氮的积累,启动速度越快,三者分别经35,30,29d实现了亚硝化的启动;稳定运行阶段,三者的氨氮容积去除负荷分别为0.57,0.48,0.40d-1,曝停时间比越小,则氨氮去除负荷越小,COD去除效果没有明显区别;1#运行至第82d时,亚硝化率呈现逐渐下降的趋势,2#、3#仍能稳定运行,因此曝停时间比越小,越有利于抑制NOB的增殖,维持亚硝化的稳定,且污泥沉降性能越好,越有利于抑制丝状菌污泥膨胀.

Effects of different ratios of aeration time and anaerobic time on shortcut nitrification in the intermittent aeration SBR

Under room temperature (20~25℃), in intermittent aeration sequencing batch reactors 1 #, 2 #, 3 #, it was studied that effects of different ratios of aeration time and anaerobic time (3:1, 3:2, 3:3) on the nitrite accumulation, the stability of nitrosation, the pollutants removal efficiency and sludge settling performance with domestic wastewater. The smaller the ratio of aeration time and anaerobic time within a certain rangeis,the more beneficial to the accumulation of nitriteis.It realized the start-up of nitrosation by 35d, 30d, 29d respectively.In stable operation stage, the removal of ammonia nitrogen volume of load were 0.57, 0.48, 0.40kgN/m3 drespectively.The smaller the ratio of aeration time and anaerobic timeis,the smaller ammonia nitrogen removal load was. The differences of COD removal effect were not obvious.At 82d the nitrosation rate of 1# showed a trend of gradual decline, but it had a stable operation in 2 #, 3 #.So the smaller the ratio of aeration time and anaerobic timeis , the more conducive to maintain the stability of nitrosation, and the better sludge settling performance was.