Liu Wen-Ru, Shen Yao-Liang, Ding Ling-Ling, Ding Min
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Huan Jing Ke Xue. 2013 Jun;34(6):2302-8.
Using synthetic ammonia-rich wastewater as influent, rapid start-up of the nitrification reactor was attained in a laboratory-scale column-type sequencing batch reactor (SBR) inoculated with aerobic granular sludge, by gradually increasing the influent NH4(+) -N concentration (100-1000 mg x L(-1)) and decreasing the hydraulic retention time (8-4 h) under mesophilic condition (28-30 degrees C). The influent loading rate of NH4(+) -N reached 3.9 kg x (m3 x d)(-1) and the average ammonia removal efficiency was above 95% within one month. Values of ammonia oxidizing rate (AOR) as high as 5.0 kg x (m3 x d)(-1) was obtained in the following operational stage with extremely high nitrogen loading rate. Nitrite accumulation obviously occurred during the start-up period. The nitrite accumulation rate reached 2-4.5 kg x (m3 x d)(-1) from day 25 to 70. In spite of the change in the feeding composition (COD/N ratio) and the frequent fluctuations of nitrogen loading rate, the granules maintained their structures, with the SVI of 30-40 mL x g(-1). The amount of granules with diameter larger than 0.21 mm was about 93% (mass fraction) of the total on day 36. The granular color changed from yellow to brownish-yellow, and some turned brown in this study. All these results suggested the critical role of aerobic granular sludge as seed sludge for the rapid start-up of nitrifying processes and the formation of nitrifying granules.
以富含合成氨的废水为进水，在接种了好氧颗粒污泥的实验室规模的柱式序批式反应器（SBR）中，通过在中温条件（28 - 30摄氏度）下逐渐提高进水NH4(+) - N浓度（100 - 1000 mg·L(-1)）并缩短水力停留时间（8 - 4小时），实现了硝化反应器的快速启动。进水NH4(+) - N的负荷率达到3.9 kg·(m3·d)(-1)，且在一个月内平均氨去除效率高于95%。在随后极高氮负荷率的运行阶段，获得了高达5.0 kg·(m3·d)(-1)的氨氧化速率（AOR）值。在启动期明显出现了亚硝酸盐积累。从第25天到第70天，亚硝酸盐积累率达到2 - 4.5 kg·(m3·d)(-1)。尽管进水组成（COD/N比）发生了变化以及氮负荷率频繁波动，但颗粒仍保持其结构，污泥体积指数（SVI）为30 - 40 mL·g(-1)。在第36天，直径大于0.21 mm的颗粒量约占总量的93%（质量分数）。在本研究中，颗粒颜色从黄色变为棕黄色，有些变为棕色。所有这些结果表明，好氧颗粒污泥作为种子污泥在硝化过程快速启动和硝化颗粒形成中起着关键作用。
