Reactor kinetics evaluation and performance investigation of a long-term operated UASB-anammox mixed culture process
Reactor kinetics evaluation and performance investigation of a long-term operated UASB-anammox mixed culture process
复制标题
DOI：
10.1016/j.ibiod.2015.11.024
复制
发表时间：
2016-03
影响因子：
4.8
通讯作者：
Qigui Niu;Yanlong Zhang;Haiyuan Ma;Shilong He;Y. Li
中科院分区：
文献类型：
--
作者：
Qigui Niu;Yanlong Zhang;Haiyuan Ma;Shilong He;Y. Li
为优化UASB-厌氧氨氧化混合培养工艺的运行，了解其运行与潜在能力的关系，建立了反应器动力学模型，并估算了潜在氮转化率。采用改进的Stovere-Kincannon模型、Monod模型、一级模型和Grau二级基质去除模型对总氮（TN）、氨氮（NH 4+-N）和硝态氮（NO2 −-N）去除率进行了模拟和预测。用货车-der梅尔模型和Heertjes模型对氮气产率进行了评价。在此过程中，氮负荷（NLR）随着基质浓度从280 mg L-1增加到462 mg L-1而从0.93 g L-1d-1增加到7.34 g L-1d-1，水力停留时间（HRT）从24 h减少到1.5 h，NH 4+-N、NO2--N和TN的最高去除率分别为99%、95%和90%.模拟结果表明，修正的Stover-Kincannon模型和Grau二阶模型是最合适的模型，预测的最大TN去除速率Umax和饱和值常数K B分别为3.33和4.03 g N L− 1 d− 1.动力学实验数据与预测值之间的线性验证表明，两个模型能较好地描述UASB-厌氧氨氧化混合培养的动力学行为。反应器动力学评价结果对指导或优化操作条件具有重要的参考价值。
To optimize the operation and know the relationships between operation and potential capability of UASB-anammox mixed culture process, reactor kinetic models were conducted and the potential nitrogen conversion rates were estimated. Total nitrogen (TN), NH 4+-N and NO 2−-N removal efficiency were simulated and predicted by modified Stovere-Kincannon model, Monod model, First-order model and Grau second-order substrate removal models. The nitrogen gas production rate was also evaluated by Van der meer and heertjes model. During the process, the nitrogen loading rate (NLR) was increased from 0.93 to 7.34 g L− 1 d− 1 following the substrate increased from 280 to 462 mg N L− 1 and hydraulic residence times (HRT) decreased from 24 h to 1.5 h, the highest achieved removal efficiency of NH 4+–N, NO 2−–N and TN were 99, 95 and 90%, respectively. Simulation results proved that the Modified Stover-Kincannon model and the Grau second-order model were the most appropriate models with prospected maximum TN removal rate U max and saturation value constant K B were 3.33 and 4.03 g N L− 1 d− 1, respectively. Validation of the linearity between the experimental data and predicted values of kinetics illustrated the two models appropriately described the kinetic behavior of UASB-anammox mixed culture. The reactor kinetic evaluation proved valuable information for guiding or optimizing the operation condition.