Civil Engineering Department, Indian Institute of Engineering Science and Technology, Shibpur, India E-mail:
Water Sci Technol. 2020 Jan;81(1):62-70. doi: 10.2166/wst.2020.080.
Nitrification of ammonium nitrogen (NH -N)-bearing synthetic wastewater was performed in a batch-activated sludge reactor by varying the initial ammonium nitrogen concentration up to 400 mg/L at a pH of 8.1 ± 0.2 and temperature of 36 ± 2 C for developing the process kinetics using acclimatised biomass. Maximum ammonium nitrogen removal efficiency of 98.3% was achieved with initial ammonium nitrogen and mixed liquor suspended solids concentration of 235 mg/L and 2,180 mg/L, respectively, at 48 h batch period. Based on the experimental results, kinetic constants for ammonia nitrogen removal following Monod's approach were obtained as maximum substrate removal rate coefficient = 0.057 per day, yield coefficient = 0.336 mg volatile suspended solids/mg ammonium nitrogen, half velocity constant = 12.95 mg NH -N/L and endogenous decay constant = 0.02 per day. Nitrification is a consecutive reaction with ammonium oxidation as the first step followed by nitrite oxidation. The overall rate of nitrite and nitrate formation was observed to be 1.44 per day and 0.34 per day, respectively.
采用驯化后的活性污泥，在 pH 值为 8.1±0.2、温度为 36±2°C 的间歇式活性污泥反应器中，通过将初始氨氮浓度提高到 400mg/L，研究了含氨氮（NH 4 -N）的合成废水的硝化过程动力学。在 48 小时的间歇周期内，初始氨氮和混合液悬浮固体浓度分别为 235mg/L 和 2180mg/L 时，氨氮去除效率达到 98.3%。根据实验结果，采用 Monod 方法得出了氨氮去除的动力学常数，最大基质去除速率系数为 0.057 天 -1 ，产率系数为 0.336mg 挥发性悬浮固体/mg 氨氮，半速度常数为 12.95mg NH 4 -N/L，内源性衰减常数为 0.02 天 -1 。硝化是一个连续反应，第一步是铵氧化，然后是亚硝酸盐氧化。观察到亚硝酸盐和硝酸盐的总形成速率分别为 1.44 天 -1 和 0.34 天 -1 。
