AOB溶解氧亲和力低于NOB条件下序批反应器中NOB淘汰的实现机制.PDF

中国环境科学 2016,36(12) ：3583~3590 China Environmental Science AOB 溶解氧亲和力低于 NOB 条件下序批反应器中 NOB 淘汰的实现机制 * 吴 军 ,张 悦,徐 婷,严 刚 (扬州大学环境科学与工程学院,江苏 扬州 225000) 摘要：经精确测定 AOB 和 NOB 的溶解氧半速度常数及其他动力学参数,研究在 AOB 溶解氧亲和力低于 NOB 条件 ,在序批反应器中短 程硝化实现机制.测得 AOB 和 NOB 的溶解氧半速度常数分别为 0.46 和 0.14mg O /L.在这种条件 ,AOB 的最大比生长速率高于 NOB 是 2 实现短程硝化的重要特点,测得的 AOB 和 NOB 最大比生长速率分别为 0.65 和 0.45d- 1.两级硝化数学模拟的结果表明,在 AOB 的溶解氧亲 和力低于 NOB 条件 ,低溶解氧和高泥龄都不利于短程硝化实现,而较高溶解氧和低泥龄的组合条件有利于短程硝化实现.在序批反应中 的实验结果验证了数学模拟结论的正确性. 关键词：短程硝化；数学模拟；溶解氧亲和力；污泥龄；溶解氧浓度 中图分类号：X703.1 文献标识码：A 文章编号：1000-6923(2016)12-3583-08 Mechanisms of partial nitrification in sequencing batch reactor under the condition of AOB oxygen affinity lower * than NOB. WU Jun , ZHANG Yue, XU Ting, YAN Gang (School of Environmental Engineering and science, Yangzhou University, Jiangsu, Yangzhou, 225000). China Environmental Science, 2016,36(12)：3583~3590 Abstract ：The mechanisms of partial nitrification in sequencing batch reactor was studied under the condition of AOB oxygen affinity lower than NOB by calibrating the kinetic parameters of nitrification accurately. The measured DO half saturation constants for AOB and NOB were 0.46 and 0.14mg O2/L respectively. Under the condition, the higher AOB specific growth rate than NOB was an important feature for achieving partial nitrification. The AOB and NOB specific growth rates were measured at 0.65 and 0.45 d- 1 respectively. The two-step nitrification model simulation indicated that the low DO and high SRT (sludge retention time) conditions were detrimental for achieving partial nitrification, which could be more readily achieved under the combined condition of relative high DO and low SRT. The experimental result verified